ORCID Profile
0000-0002-4421-601X
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Quantum Optics And Lasers | Optical Physics | Optics And Opto-Electronic Physics | Quantum Optics | Atomic And Molecular Physics | Quantum Physics | Atomic, Molecular, Nuclear, Particle and Plasma Physics | Mathematical Aspects of Classical Mechanics, Quantum Mechanics and Quantum Information Theory | Nanotechnology | Quantum Information, Computation and Communication | Nonlinear Optics and Spectroscopy | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Lasers and Quantum Electronics | Quantum optics and quantum optomechanics | Quantum physics | Nanoscale Characterisation | Nanotechnology | Lasers and quantum electronics | Functional materials | Photonics optoelectronics and optical communications | Nanomaterials | Nanoscale characterisation | Precision engineering | Functional Materials | Theoretical Physics | Photonics, Optoelectronics and Optical Communications | Nanoelectromechanical Systems
ANZSRC Socio-Economic Objective (SEO)
Physical sciences | Scientific instrumentation | Expanding Knowledge in the Physical Sciences | Telecommunications | Computer Hardware and Electronic Equipment not elsewhere classified | Industrial instrumentation | Scientific Instruments | National Security | Expanding Knowledge in Technology | Network Infrastructure Equipment | Expanding Knowledge in Engineering | Integrated Circuits and Devices | Integrated Systems | Communication equipment not elsewhere classified |
Related Links
Publications
Non-Gaussian Mechanical Motion via Single and Multiphonon Subtraction from a Thermal State
Publisher: American Physical Society (APS)
Date: 08-12-2021
Conditional quantum-state engineering using ancillary squeezed-vacuum states
Publisher: American Physical Society (APS)
Date: 19-09-2006
TEM 10
Publisher: American Physical Society (APS)
Date: 30-11-2006
Engineering 3D living brain tumour equivalents as macroscopic test-systems for the development of optical imaging and sensing applications (Conference Presentation)
Publisher: SPIE
Date: 04-03-2019
DOI: 10.1117/12.2509582
Maximization of Extractable Randomness in a Quantum Random-Number Generator
Publisher: American Physical Society (APS)
Date: 11-05-2015
Continuous-variable quantum-state sharing via quantum disentanglement
Publisher: American Physical Society (APS)
Date: 24-03-2005
Continuous-variable spatial entanglement for bright optical beams
Publisher: American Physical Society (APS)
Date: 05-07-2005
Nonlinear Entanglement and its Application to Generating Cat States
Publisher: American Physical Society (APS)
Date: 10-03-2015
Experimental investigation of continuous-variable quantum teleportation
Publisher: American Physical Society (APS)
Date: 10-03-2003
Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit
Publisher: Springer Science and Business Media LLC
Date: 06-07-2020
DOI: 10.1038/S41377-020-00347-Y
Abstract: Long-range and fast transport of coherent excitons is important for the development of high-speed excitonic circuits and quantum computing applications. However, most of these coherent excitons have only been observed in some low-dimensional semiconductors when coupled with cavities, as there are large inhomogeneous broadening and dephasing effects on the transport of excitons in their native states in materials. Here, by confining coherent excitons at the 2D quantum limit, we first observed molecular aggregation-enabled ‘supertransport’ of excitons in atomically thin two-dimensional (2D) organic semiconductors between coherent states, with a measured high effective exciton diffusion coefficient of ~346.9 cm 2 /s at room temperature. This value is one to several orders of magnitude higher than the values reported for other organic molecular aggregates and low-dimensional inorganic materials. Without coupling to any optical cavities, the monolayer pentacene s le, a very clean 2D quantum system (~1.2 nm thick) with high crystallinity (J-type aggregation) and minimal interfacial states, showed superradiant emission from Frenkel excitons, which was experimentally confirmed by the temperature-dependent photoluminescence (PL) emission, highly enhanced radiative decay rate, significantly narrowed PL peak width and strongly directional in-plane emission. The coherence in monolayer pentacene s les was observed to be delocalised over ~135 molecules, which is significantly larger than the values (a few molecules) observed for other organic thin films. In addition, the supertransport of excitons in monolayer pentacene s les showed highly anisotropic behaviour. Our results pave the way for the development of future high-speed excitonic circuits, fast OLEDs, and other optoelectronic devices.
Experimental demonstration of post-selection-based continuous-variable quantum key distribution in the presence of Gaussian noise
Publisher: American Physical Society (APS)
Date: 14-09-2007
Highly efficient optical quantum memory with long coherence time in cold atoms
Publisher: The Optical Society
Date: 15-01-2016
Phase estimation of coherent states with a noiseless linear amplifier
Publisher: World Scientific Pub Co Pte Lt
Date: 02-2017
DOI: 10.1142/S0219749917500095
Abstract: Amplification of quantum states is inevitably accompanied with the introduction of noise at the output. For protocols that are probabilistic with heralded success, noiseless linear lification in theory may still be possible. When the protocol is successful, it can lead to an output that is a noiselessly lified copy of the input. When the protocol is unsuccessful, the output state is degraded and is usually discarded. Probabilistic protocols may improve the performance of some quantum information protocols, but not for metrology if the whole statistics is taken into consideration. We calculate the precision limits on estimating the phase of coherent states using a noiseless linear lifier by computing its quantum Fisher information and we show that on average, the noiseless linear lifier does not improve the phase estimate. We also discuss the case where abstention from measurement can reduce the cost for estimation.
Experimental characterization of continuous-variable entanglement
Publisher: American Physical Society (APS)
Date: 12-01-2004
Understanding cellular glycan surfaces in the central nervous system
Publisher: Portland Press Ltd.
Date: 17-12-2019
DOI: 10.1042/BST20180330
Abstract: Glycosylation, the enzymatic process by which glycans are attached to proteins and lipids, is the most abundant and functionally important type of post-translational modification associated with brain development, neurodegenerative disorders, psychopathologies and brain cancers. Glycan structures are erse and complex however, they have been detected and targeted in the central nervous system (CNS) by various immunohistochemical detection methods using glycan-binding proteins such as anti-glycan antibodies or lectins and/or characterized with analytical techniques such as chromatography and mass spectrometry. The glycan structures on glycoproteins and glycolipids expressed in neural stem cells play key roles in neural development, biological processes and CNS maintenance, such as cell adhesion, signal transduction, molecular trafficking and differentiation. This brief review will highlight some of the important findings on differential glycan expression across stages of CNS cell differentiation and in pathological disorders and diseases such as Alzheimer's disease, Parkinson's disease, Huntington's disease, multiple sclerosis, amyotrophic lateral sclerosis, schizophrenia and brain cancer.
On the equivalence between squeezing and entanglement potential for two-mode Gaussian states
Publisher: Springer Science and Business Media LLC
Date: 20-07-2023
DOI: 10.1038/S41598-023-38572-1
Abstract: The maximum amount of entanglement achievable under passive transformations by continuous-variable states is called the entanglement potential. Recent work has demonstrated that the entanglement potential is upper-bounded by a simple function of the squeezing of formation, and that certain classes of two-mode Gaussian states can indeed saturate this bound, though saturability in the general case remains an open problem. In this study, we introduce a larger class of states that we prove saturates the bound, and we conjecture that all two-mode Gaussian states can be passively transformed into this class, meaning that for all two-mode Gaussian states, entanglement potential is equivalent to squeezing of formation. We provide an explicit algorithm for the passive transformations and perform extensive numerical testing of our claim, which seeks to unite the resource theories of two characteristic quantum properties of continuous-variable systems.
On the equivalence between squeezing and entanglement potential for two-mode Gaussian states
Publisher: Research Square Platform LLC
Date: 20-12-2022
DOI: 10.21203/RS.3.RS-2319068/V1
Abstract: The maximum amount of entanglement achievable under passive transformations by continuous-variable states is called the entanglement potential. Recent work has demonstrated that the entanglement potential is upper-bounded by a simple function of the squeezing of formation, and that certain classes of two-mode Gaussian states can indeed saturate this bound, though saturability in the general case remains an open problem. In this study, we introduce a larger class of states that we prove saturates the bound, and we conjecture that all two-mode Gaussians can be passively transformed into this class, meaning that for all two-mode Gaussian states, entanglement potential is equivalent to squeezing of formation. We provide an explicit algorithm for the passive transformations and perform extensive numerical testing of our claim, which seeks to unite the resource theories of two characteristic quantum properties of continuous-variable systems.
Colloquium: The Einstein-Podolsky-Rosen paradox: From concepts to applications
Publisher: American Physical Society (APS)
Date: 10-12-2009
Storage and manipulation of light using a Raman gradient-echo process
Publisher: IOP Publishing
Date: 08-06-2012
Reconstruction of photon number conditioned states using phase randomized homodyne measurements
Publisher: IOP Publishing
Date: 09-05-2013
Squeezing and entanglement delay using slow light
Publisher: American Physical Society (APS)
Date: 14-03-2005
Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution
Publisher: The Optical Society
Date: 10-06-2016
Squeezed light for bandwidth-limited atom optics experiments at the rubidium D1 line
Publisher: IOP Publishing
Date: 20-12-2006
Spatial-mode storage in a gradient-echo memory
Publisher: American Physical Society (APS)
Date: 08-2012
A bright future for quantum communications
Publisher: Springer Science and Business Media LLC
Date: 12-2009
Quantum enhancement of signal-to-noise ratio with a heralded linear amplifier
Publisher: The Optical Society
Date: 16-11-2017
Continuous improvement
Publisher: Springer Science and Business Media LLC
Date: 14-04-2013
Secure Random Number Generation in Continuous Variable Systems
Publisher: Springer International Publishing
Date: 2020
Theoretical analysis of an ideal noiseless linear amplifier for Einstein–Podolsky–Rosen entanglement distillation
Publisher: IOP Publishing
Date: 15-10-2014
Precision spectral manipulation: a demonstration using a coherent optical memory
Publisher: AIP Publishing LLC
Date: 2014
DOI: 10.1063/1.4903159
Approaching optimal entangling collective measurements on quantum computing platforms
Publisher: Springer Science and Business Media LLC
Date: 12-01-2023
DOI: 10.1038/S41567-022-01875-7
Abstract: Entanglement is a fundamental feature of quantum mechanics and holds great promise for enhancing metrology and communications. Much of the focus of quantum metrology so far has been on generating highly entangled quantum states that offer better sensitivity, per resource, than what can be achieved classically. However, to reach the ultimate limits in multi-parameter quantum metrology and quantum information processing tasks, collective measurements, which generate entanglement between multiple copies of the quantum state, are necessary. Here, we experimentally demonstrate theoretically optimal single- and two-copy collective measurements for simultaneously estimating two non-commuting qubit rotations. This allows us to implement quantum-enhanced sensing, for which the metrological gain persists for high levels of decoherence, and to draw fundamental insights about the interpretation of the uncertainty principle. We implement our optimal measurements on superconducting, trapped-ion and photonic systems, providing an indication of how future quantum-enhanced sensing networks may look.
Enhancing the precision limits of interferometric satellite geodesy missions
Publisher: Springer Science and Business Media LLC
Date: 08-06-2022
DOI: 10.1038/S41526-022-00204-9
Abstract: Satellite geodesy uses the measurement of the motion of one or more satellites to infer precise information about the Earth’s gravitational field. In this work, we consider the achievable precision limits on such measurements by examining approximate models for the three main noise sources in the measurement process of the current Gravitational Recovery and Climate Experiment (GRACE) Follow-On mission: laser phase noise, accelerometer noise and quantum noise. We show that, through time-delay interferometry, it is possible to remove the laser phase noise from the measurement, allowing for almost three orders of magnitude improvement in the signal-to-noise ratio. Several differential mass satellite formations are presented which can further enhance the signal-to-noise ratio through the removal of accelerometer noise. Finally, techniques from quantum optics have been studied, and found to have great promise for reducing quantum noise in other alternative mission configurations. We model the spectral noise performance using an intuitive 1D model and verify that our proposals have the potential to greatly enhance the performance of near-future satellite geodesy missions.
Teleportation of continuous-variable polarization states
Publisher: American Physical Society (APS)
Date: 06-11-2003
Enhanced photothermal cooling of nanowires
Publisher: IOP Publishing
Date: 07-07-2017
Replicating the benefits of Deutschian closed timelike curves without breaking causality
Publisher: Springer Science and Business Media LLC
Date: 24-11-2015
DOI: 10.1038/NPJQI.2015.7
Abstract: In general relativity, closed timelike curves can break causality with remarkable and unsettling consequences. At the classical level, they induce causal paradoxes disturbing enough to motivate conjectures that explicitly prevent their existence. At the quantum level such problems can be resolved through the Deutschian formalism, however this induces radical benefits—from cloning unknown quantum states to solving problems intractable to quantum computers. Instinctively, one expects these benefits to vanish if causality is respected. Here we show that in harnessing entanglement, we can efficiently solve NP-complete problems and clone arbitrary quantum states—even when all time-travelling systems are completely isolated from the past. Thus, the many defining benefits of Deutschian closed timelike curves can still be harnessed, even when causality is preserved. Our results unveil a subtle interplay between entanglement and general relativity, and significantly improve the potential of probing the radical effects that may exist at the interface between relativity and quantum theory.
Experimental investigation of the transition between Autler-Townes splitting and electromagnetically-induced-transparency models
Publisher: American Physical Society (APS)
Date: 22-01-2013
Four modes of optical parametric operation for squeezed state generation
Publisher: Springer Science and Business Media LLC
Date: 11-2003
Experimental demonstration of a squeezing-enhanced power-recycled Michelson interferometer for gravitational wave detection
Publisher: American Physical Society (APS)
Date: 23-05-2002
Unconditional room-temperature quantum memory
Publisher: Springer Science and Business Media LLC
Date: 12-06-2011
DOI: 10.1038/NPHYS2021
Observation of nonlinear dynamics in an optical levitation system
Publisher: Springer Science and Business Media LLC
Date: 04-11-2020
DOI: 10.1038/S42005-020-00467-2
Abstract: Optical levitation of mechanical oscillators has been suggested as a promising way to decouple the environmental noise and increase the mechanical quality factor. Here, we investigate the dynamics of a free-standing mirror acting as the top reflector of a vertical optical cavity, designed as a testbed for a tripod cavity optical levitation setup. To reach the regime of levitation for a milligram-scale mirror, the optical intensity of the intracavity optical field approaches 3 MW cm −2 . We identify three distinct optomechanical effects: excitation of acoustic vibrations, expansion due to photothermal absorption, and partial lift-off of the mirror due to radiation pressure force. These effects are intercoupled via the intracavity optical field and induce complex system dynamics inclusive of high-order sideband generation, optical bistability, parametric lification, and the optical spring effect. We modify the response of the mirror with active feedback control to improve the overall stability of the system.
A high-fidelity heralded quantum squeezing gate
Publisher: Springer Science and Business Media LLC
Date: 17-02-2020
Dual-rail optical gradient echo memory
Publisher: The Optical Society
Date: 21-09-2015
DOI: 10.1364/OE.23.024937
Machine Learning Cryptanalysis of a Quantum Random Number Generator
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2019
Multiparameter optimisation of a magneto-optical trap using deep learning
Publisher: Springer Science and Business Media LLC
Date: 19-10-2018
DOI: 10.1038/S41467-018-06847-1
Abstract: Machine learning based on artificial neural networks has emerged as an efficient means to develop empirical models of complex systems. Cold atomic ensembles have become commonplace in laboratories around the world, however, many-body interactions give rise to complex dynamics that preclude precise analytic optimisation of the cooling and trapping process. Here, we implement a deep artificial neural network to optimise the magneto-optic cooling and trapping of neutral atomic ensembles. The solution identified by machine learning is radically different to the smoothly varying adiabatic solutions currently used. Despite this, the solutions outperform best known solutions producing higher optical densities.
Coherent optical pulse sequencer for quantum applications
Publisher: Springer Science and Business Media LLC
Date: 09-2009
DOI: 10.1038/NATURE08325
Abstract: The bandwidth and versatility of optical devices have revolutionized information technology systems and communication networks. Precise and arbitrary control of an optical field that preserves optical coherence is an important requisite for many proposed photonic technologies. For quantum information applications, a device that allows storage and on-demand retrieval of arbitrary quantum states of light would form an ideal quantum optical memory. Recently, significant progress has been made in implementing atomic quantum memories using electromagnetically induced transparency, photon echo spectroscopy, off-resonance Raman spectroscopy and other atom-light interaction processes. Single-photon and bright-optical-field storage with quantum states have both been successfully demonstrated. Here we present a coherent optical memory based on photon echoes induced through controlled reversible inhomogeneous broadening. Our scheme allows storage of multiple pulses of light within a chosen frequency bandwidth, and stored pulses can be recalled in arbitrary order with any chosen delay between each recalled pulse. Furthermore, pulses can be time-compressed, time-stretched or split into multiple smaller pulses and recalled in several pieces at chosen times. Although our experimental results are so far limited to classical light pulses, our technique should enable the construction of an optical random-access memory for time-bin quantum information, and have potential applications in quantum information processing.
Security of continuous-variable quantum cryptography with Gaussian postselection
Publisher: American Physical Society (APS)
Date: 21-02-2013
Precision Spectral Manipulation: A Demonstration Using a Coherent Optical Memory
Publisher: American Physical Society (APS)
Date: 20-06-2012
Maximum entanglement of formation for a two-mode Gaussian state over passive operations
Publisher: American Physical Society (APS)
Date: 23-11-2020
Single-Phonon Addition and Subtraction to a Mechanical Thermal State
Publisher: American Physical Society (APS)
Date: 21-01-2021
Quantum information processing in optical images
Publisher: Elsevier BV
Date: 10-2002
Photothermally induced transparency
Publisher: American Association for the Advancement of Science (AAAS)
Date: 21-02-2020
Abstract: Photothermal-cavity nonlinearity induces a new transparency effect with demonstrated agreement between model and experiment.
Teaching a laser beam to go straight
Publisher: Informa UK Limited
Date: 11-2005
Measurement-based noiseless linear amplification for quantum communication
Publisher: Springer Science and Business Media LLC
Date: 16-03-2014
Experimental verification of quantum discord in continuous-variable states
Publisher: IOP Publishing
Date: 03-01-2014
Erratum: Squeezing and entanglement delay using slow light (Physical Review A (2005) 71 (033809))
Publisher: American Physical Society (APS)
Date: 03-11-2006
Stokes-operator-squeezed continuous-variable polarization states
Publisher: American Physical Society (APS)
Date: 28-01-2003
Tripartite quantum state sharing
Publisher: American Physical Society (APS)
Date: 29-04-2004
Experimental investigation of criteria for continuous variable entanglement
Publisher: American Physical Society (APS)
Date: 29-01-2003
Optical entanglement of co-propagating modes
Publisher: Springer Science and Business Media LLC
Date: 21-06-2009
Surpassing the repeaterless bound with a photon-number encoded measurement-device-independent quantum key distribution protocol
Publisher: Springer Science and Business Media LLC
Date: 28-03-2023
DOI: 10.1038/S41534-023-00698-5
Abstract: Decoherence is detrimental to quantum key distribution (QKD) over large distances. One of the proposed solutions is to use quantum repeaters, which ide the total distance between the users into smaller segments to minimise the effects of the losses in the channel. Here we introduce a measurement-device-independent protocol which uses high-dimensional states prepared by two distant trusted parties and a coherent total photon number detection for the entanglement swapping measurement at the repeater station. We present an experimentally feasible protocol that can be implemented with current technology as the required states reduce down to the single-photon level over large distances. This protocol outperforms the existing measurement-device-independent and twin-field QKD protocols by achieving better key rates in general and higher transmission distance in total when experimental imperfections are considered. It also surpasses the fundamental limit of the repeaterless bound at a much shorter transmission distance in comparison to the existing TF-QKD protocols.
Electromagnetically induced transparency and four-wave mixing in a cold atomic ensemble with large optical depth
Publisher: IOP Publishing
Date: 24-11-2014
Ultimate precision of joint quadrature parameter estimation with a Gaussian probe
Publisher: American Physical Society (APS)
Date: 09-01-2018
Optimal probes for continuous-variable quantum illumination
Publisher: American Physical Society (APS)
Date: 14-06-2021
An ultra-high optical depth cold atomic ensemble for quantum memories
Publisher: IOP Publishing
Date: 06-12-2013
Dynamics and stability of an optically levitated mirror
Publisher: American Physical Society (APS)
Date: 27-05-2020
Targeting cell surface glycans with lectin-coated fluorescent nanodiamonds
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NA00036A
Abstract: Nanodiamonds were coated in lectins to target glycan receptors on astrocytes, neurons and microglia. The uptake in each cell type was variable depending on their coating of Aleuria aurantia lectin, wheat germ agglutinin or tomato lectin.
Overarching framework between Gaussian quantum discord and Gaussian quantum illumination
Publisher: American Physical Society (APS)
Date: 23-02-2017
A quantum study of multibit phase coding for optical storage
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2006
Squeezing in the audio gravitational-wave detection band
Publisher: American Physical Society (APS)
Date: 15-10-2004
Squeezed light at sideband frequencies below 100 kHz from a single OPA
Publisher: Elsevier BV
Date: 10-2004
Multiparameter Estimation with Two-Qubit Probes in Noisy Channels
Publisher: MDPI AG
Date: 26-07-2023
DOI: 10.3390/E25081122
Abstract: This work compares the performance of single- and two-qubit probes for estimating several phase rotations simultaneously under the action of different noisy channels. We compute the quantum limits for this simultaneous estimation using collective and in idual measurements by evaluating the Holevo and Nagaoka–Hayashi Cramér-Rao bounds, respectively. Several quantum noise channels are considered, namely the decohering channel, the litude d ing channel, and the phase d ing channel. For each channel, we find the optimal single- and two-qubit probes. Where possible we demonstrate an explicit measurement strategy that saturates the appropriate bound and we investigate how closely the Holevo bound can be approached through collective measurements on multiple copies of the same probe. We find that under the action of the considered channels, two-qubit probes show enhanced parameter estimation capabilities over single-qubit probes for almost all non-identity channels, i.e., the achievable precision with a single-qubit probe degrades faster with increasing exposure to the noisy environment than that of the two-qubit probe. However, in sufficiently noisy channels, we show that it is possible for single-qubit probes to outperform maximally entangled two-qubit probes. This work shows that, in order to reach the ultimate precision limits allowed by quantum mechanics, entanglement is required in both the state preparation and state measurement stages. It is hoped the tutorial-esque nature of this paper will make it easily accessible.
Optomechanically induced carrier-envelope-phase-dependent effects and their analytical solutions
Publisher: American Physical Society (APS)
Date: 06-2017
Synthesis of optical spring potentials in optomechanical systems
Publisher: IOP Publishing
Date: 25-05-2016
Enhancing quantum teleportation efficacy with noiseless linear amplification
Publisher: Springer Science and Business Media LLC
Date: 07-08-2023
DOI: 10.1038/S41467-023-40438-Z
Abstract: Quantum teleportation constitutes a fundamental tool for various applications in quantum communication and computation. However, state-of-the-art continuous-variable quantum teleportation is restricted to moderate fidelities and short-distance configurations. This is due to unavoidable experimental imperfections resulting in thermal decoherence during the teleportation process. Here we present a heralded quantum teleporter able to overcome these limitations through noiseless linear lification. As a result, we report a high fidelity of 92% for teleporting coherent states using a modest level of quantum entanglement. Our teleporter in principle allows nearly complete removal of loss induced onto the input states being transmitted through imperfect quantum channels. We further demonstrate the purification of a displaced thermal state, impossible via conventional deterministic lification or teleportation approaches. The combination of high-fidelity coherent state teleportation alongside the purification of thermalized input states permits the transmission of quantum states over significantly long distances. These results are of both practical and fundamental significance overcoming long-standing hurdles en route to highly-efficient continuous-variable quantum teleportation, while also shining new light on applying teleportation to purify quantum systems from thermal noise.
Compact flexible multi-pass rotary delay line using spinning micro-machined mirrors
Publisher: Springer Science and Business Media LLC
Date: 24-08-2017
DOI: 10.1038/S41598-017-09576-5
Abstract: We propose a new method to extend the path length tunability of rotary delay-lines. This method was shown to achieve a duty cycle of % and repetition rates of over 40 kHz. The new method relies on a new multi-segmented micro-machined mirror and serial injection of a single reflection onto separate segments of this mirror. The tunability is provided by the relative positioning of each reflective point on the mirror segments. There are two distinct modes of operation: synchronous and asynchronous. By simply manipulating the spatial position of the returning paths over the respective mirror segments, we can switch between increasing the repetition rate (asynchronous mode) or the total delay path (synchronous mode). We experimentally demonstrated up to 8 m/s scans with repetition rates of up to 42.7 kHz. Furthermore, we present numerical simulations of 18 reflection points to illustrate possibility of achieving a scan speed of up to 80 m/s. Through intermediate combinations of synchronous and asynchronous operation modes with 4 or more passes, we also show that the system can simultaneously increase both repetition rate and scan depth.
Direct imaging of slow, stored and stationary EIT polaritons
Publisher: IOP Publishing
Date: 17-07-2017
Characterization of a measurement-based noiseless linear amplifier and its applications
Publisher: American Physical Society (APS)
Date: 13-07-2017
Surpassing the Standard Quantum Limit for Optical Imaging Using Nonclassical Multimode Light
Publisher: American Physical Society (APS)
Date: 03-05-2002
Optomechanical Magnetometry with a Macroscopic Resonator
Publisher: American Physical Society (APS)
Date: 15-04-2016
Mutual information-based approach to adaptive homodyne detection of quantum optical states
Publisher: American Physical Society (APS)
Date: 16-08-2005
Surpassing the no-cloning limit with a heralded hybrid linear amplifier for coherent states
Publisher: Springer Science and Business Media LLC
Date: 26-06-2018
DOI: 10.1038/NCOMMS13222
Abstract: The no-cloning theorem states that an unknown quantum state cannot be cloned exactly and deterministically due to the linearity of quantum mechanics. Associated with this theorem is the quantitative no-cloning limit that sets an upper bound to the quality of the generated clones. However, this limit can be circumvented by abandoning determinism and using probabilistic methods. Here, we report an experimental demonstration of probabilistic cloning of arbitrary coherent states that clearly surpasses the no-cloning limit. Our scheme is based on a hybrid linear lifier that combines an ideal deterministic linear lifier with a heralded measurement-based noiseless lifier. We demonstrate the production of up to five clones with the fidelity of each clone clearly exceeding the corresponding no-cloning limit. Moreover, since successful cloning events are heralded, our scheme has the potential to be adopted in quantum repeater, teleportation and computing applications.
Observation of cross phase modulation in cold atom gradient echo memory
Publisher: IOP Publishing
Date: 09-2022
Abstract: Strong nonlinear interactions between single photons have important applications in optical quantum information processing. Demonstrations of these interactions in cold atomic ensembles have largely been limited to exploiting slow light generated using electromagnetically induced transparency (EIT). However, these EIT implementations have limited achievable phase shifts due to spontaneous emission. Here, we demonstrate and characterize a scheme free from these limitations using gradient echo memory with inferred single photon phase shifts of 0.07 ± 0.02 μ rad. Excellent agreement with theoretical modelling was observed. Degradation of memory efficiency was observed for large phase shifts but strategies to overcome that are presented.
Publisher’s Note: First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds [Phys. Rev. DPRVDAQ0556-282176, 022001 (2007)]
Publisher: American Physical Society (APS)
Date: 30-07-2007
Demonstrating various quantum effects with two entangled laser beams
Publisher: Springer Science and Business Media LLC
Date: 23-06-2011
Laser actuation of cantilevers for picometre amplitude dynamic force microscopy
Publisher: Springer Science and Business Media LLC
Date: 04-07-2014
DOI: 10.1038/SREP05567
Abstract: As nanoscale and molecular devices become reality, the ability to probe materials on these scales is increasing in importance. To address this, we have developed a dynamic force microscopy technique where the flexure of the microcantilever is excited using an intensity modulated laser beam to achieve modulation on the picoscale. The flexure arises from thermally induced bending through differential expansion and the conservation of momentum when the photons are reflected and absorbed by the cantilever. In this study, we investigated the photothermal and photon pressure responses of monolithic and layered cantilevers using a modulated laser in air and immersed in water. The developed photon actuation technique is applied to the stretching of single polymer chains.
Stationary Light in Atomic Media
Publisher: Wiley
Date: 30-04-2019
Squeezing more from a quantum nondemolition measurement
Publisher: American Physical Society (APS)
Date: 13-12-2001
Photothermal fluctuations as a fundamental limit to low-frequency squeezing in a degenerate optical parametric oscillator
Publisher: American Physical Society (APS)
Date: 24-10-2005
Machine learner optimization of optical nanofiber-based dipole traps
Publisher: American Vacuum Society
Date: 11-05-2022
DOI: 10.1116/5.0086507
Abstract: We use a machine learning optimizer to increase the number of rubidium-87 atoms trapped in an optical nanofiber-based two-color evanescent dipole trap array. Collisional blockade limits the average number of atoms per trap to about 0.5, and a typical uncompensated rubidium trap has even lower occupancy due to challenges in simultaneously cooling atoms and loading them in the traps. Here, we report on the implementation of an in-loop stochastic artificial neural network machine learner to optimize this loading by optimizing the absorption of a near-resonant, nanofiber-guided, probe beam. By giving the neural network control of the laser cooling process, we observe an increase in peak optical depth of 66% from 3.2 ± 0.2 to 5.3 ± 0.3. We use a microscopic model of the atomic absorption to infer an increase in the number of dipole-trapped atoms from 300 ± 60 to 450 ± 90 and a small decrease in their average temperature from 150 to 140 μK. The machine learner is able to quickly and effectively explore the large parameter space of the laser cooling control process so as to find optimal parameters for loading the dipole traps. The increased number of atoms should facilitate studies of collective atom–light interactions mediated via the evanescent field.
Quantum study of information delay in electromagnetically induced transparency
Publisher: American Physical Society (APS)
Date: 02-11-2006
Generation and interferometric analysis of high charge optical vortices
Publisher: IOP Publishing
Date: 04-2013
High efficiency coherent optical memory with warm rubidium vapour
Publisher: Springer Science and Business Media LLC
Date: 02-2011
DOI: 10.1038/NCOMMS1175
A gravitational wave observatory operating beyond the quantum shot-noise limit
Publisher: Springer Science and Business Media LLC
Date: 11-09-2011
DOI: 10.1038/NPHYS2083
The nonlinearity of single photons
Publisher: Springer Science and Business Media LLC
Date: 30-09-2011
Memory-enhanced noiseless cross-phase modulation
Publisher: Springer Science and Business Media LLC
Date: 07-12-2012
DOI: 10.1038/LSA.2012.40
Tools for Multimode Quantum Information: Modulation, Detection, and Spatial Quantum Correlations
Publisher: American Physical Society (APS)
Date: 22-02-2007
Multipartite Einstein–Podolsky–Rosen steering and genuine tripartite entanglement with optical networks
Publisher: Springer Science and Business Media LLC
Date: 05-01-2015
DOI: 10.1038/NPHYS3202
ac Stark gradient echo memory in cold atoms
Publisher: American Physical Society (APS)
Date: 29-10-2010
Time- and frequency-domain polariton interference
Publisher: IOP Publishing
Date: 13-03-2012
Optimal measurement of the tilt and displacement of a Gaussian bundle
Publisher: EDP Sciences
Date: 10-2006
Spatial-state Stokes-operator squeezing and entanglement for optical beams
Publisher: American Physical Society (APS)
Date: 23-04-2009
Quantum-state engineering with continuous-variable postselection
Publisher: American Physical Society (APS)
Date: 06-04-2006
Benefits and risks of zinc for adults during covid-19: rapid systematic review and meta-analysis of randomised controlled trials
Publisher: Cold Spring Harbor Laboratory
Date: 04-11-2020
DOI: 10.1101/2020.11.02.20220038
Abstract: To evaluate the benefits and risks of any type of zinc intervention to prevent or treat SARS-CoV-2. A living, systematic review and meta-analysis, incorporating rapid review methods. 17 English and Chinese databases and clinical trial registries were searched in April/May 2020, with additional covid-19 focused searches in June and August 2020. Randomized control trials (RCTs) published in any language comparing zinc to a control to prevent or treat SARS-CoV-2. Other viral respiratory tract infections (RTIs) were included, but the certainty of evidence downgraded twice for indirectness. Screening, data extraction, risk of bias appraisal (RoB-2 tool) and verification was performed by calibrated, single reviewers. RCTs with adult populations were prioritised for analysis. 123 RCTs were identified. None were specific to SARS-CoV-2 nor other coronaviruses. 28 RCTs evaluated oral (15-45mg daily), sublingual (45-300mg daily), or topical nasal (0.09-2.6 mg daily) zinc to prevent or treat nonspecific viral RTIs in 3,597 adults without zinc deficiency. Compared to placebo, zinc prevented 5 mild to moderate RTIs per 100 person-months, including in older adults (95% confidence interval 1 to 9) (number needed to treat (NTT)=20). There was no significant difference in the rates of non-serious adverse events (AE). For RTI treatment, a clinically important reduction in peak symptom severity scores was found for zinc compared to placebo (mean difference 1.2 points, 0.7 to 1.7), but not average daily symptom severity (standardised mean difference 0.2, 0.1 to 0.4). 19 fewer per 100 adults were at risk of remaining symptomatic over the first 7 days (2 to 38, NNT=5) and the mean duration of symptoms was 2 days shorter (0.2 to 3.5), however, there was substantial heterogeneity (I 2 = 82% and 97%). 14 more per 100 experienced a non-serious AE (4 to 16, NNT=7) such as nausea, or mouth or nasal irritation. No differences in illness duration nor AE were found when zinc was compared to active controls. No serious AE, including copper deficiency, were reported by any RCT. Quality of life outcomes were not assessed. Confidence in these findings for SARS-CoV-2 is very low due to serious indirectness and some concerns about bias for most outcomes. Zinc is a potential therapeutic candidate for preventing and treating SARS-CoV-2, including older adults and adults without zinc deficiency (very low certainty). Zinc may also help to prevent other viral RTIs during the pandemic (moderate certainty) and reduce the severity and duration of symptoms (very low certainty). The pending results from seven RCTs evaluating zinc for SARS-CoV-2 will be tracked. PROSPERO CRD42020182044
Asymmetric EPR entanglement in continuous variable systems
Publisher: IOP Publishing
Date: 03-11-2014
Discord as a quantum resource for bi-partite communication
Publisher: AIP Publishing LLC
Date: 2014
DOI: 10.1063/1.4903110
Decoupling cross-quadrature correlations using passive operations
Publisher: American Physical Society (APS)
Date: 19-08-2020
Multimode laser cooling and ultra-high sensitivity force sensing with nanowires
Publisher: Springer Science and Business Media LLC
Date: 14-08-2014
DOI: 10.1038/NCOMMS5663
Abstract: Photo-induced forces can be used to manipulate and cool the mechanical motion of oscillators. When the oscillator is used as a force sensor, such as in atomic force microscopy, active feedback is an enticing route to enhance measurement performance. Here we show broadband multimode cooling of -23 dB down to a temperature of 8 ± 1 K in the stationary regime. Through the use of periodic quiescence feedback cooling, we show improved signal-to-noise ratios for the measurement of transient signals. We compare the performance of real feedback to numerical post processing of data and show that both methods produce similar improvements to the signal-to-noise ratio of force measurements. We achieved a room temperature force measurement sensitivity of <2 × 10(-16)N with integration time of less than 0.1 ms. The high precision and fast force microscopy results presented will potentially benefit applications in biosensing, molecular metrology, subsurface imaging and accelerometry.
Programmable multimode quantum networks
Publisher: Springer Science and Business Media LLC
Date: 28-08-2012
DOI: 10.1038/NCOMMS2033
Quantum entanglement of angular momentum states with quantum numbers up to 10,010
Publisher: Proceedings of the National Academy of Sciences
Date: 15-11-2016
Abstract: Challenging quantum mechanical predictions is an important task to better understand the underlying principles of nature and possibly develop novel applications. Quantum entanglement as one of the key features is often investigated in optical experiments to push the known limits from smaller to larger scales, for ex le by increasing the number of entangled systems, their separation, or dimensionality. In the present study we pursue another route and investigate photons with large quantum numbers. We demonstrate entanglement between a photon with orbital angular momentum quantum numbers up to 10,010 and its partner encoded in polarization. The results show how complex the structure of entangled photons can be and hint at the large information content a single quantum system is able to carry.
A mirrorless spinwave resonator
Publisher: Springer Science and Business Media LLC
Date: 10-12-2015
DOI: 10.1038/SREP17633
Abstract: Optical resonance is central to a wide range of optical devices and techniques. In an optical cavity, the round-trip length and mirror reflectivity can be chosen to optimize the circulating optical power, linewidth and free-spectral range (FSR) for a given application. In this paper we show how an atomic spinwave system, with no physical mirrors, can behave in a manner that is analogous to an optical cavity. We demonstrate this similarity by characterising the build-up and decay of the resonance in the time domain and measuring the effective optical linewidth and FSR in the frequency domain. Our spinwave is generated in a 20 cm long Rb gas cell, yet it facilitates an effective FSR of 83 kHz, which would require a round-trip path of 3.6 km in a free-space optical cavity. Furthermore, the spinwave coupling is controllable enabling dynamic tuning of the effective cavity parameters.
Squeezed light from a diamond-turned monolithic cavity
Publisher: The Optical Society
Date: 19-02-2016
DOI: 10.1364/OE.24.004042
Corrigendum: Squeezing quadrature rotation in the acoustic band via optomechanics (2016 J. Phys. B: At. Mol. Opt. Phys. 49 065401)
Publisher: IOP Publishing
Date: 13-11-2017
Configurable Unitary Transformations and Linear Logic Gates Using Quantum Memories
Publisher: American Physical Society (APS)
Date: 04-08-2014
Generation of Squeezing in Higher Order Hermite - Gaussian Modes with an Optical Parametric Amplifier
Publisher: European Optical Society
Date: 09-06-2006
Squeezed state generation for interferometric gravitational-wave detection
Publisher: IOP Publishing
Date: 29-03-2006
Effect of atomic noise on optical squeezing via polarization self-rotation in a thermal vapor cell
Publisher: American Physical Society (APS)
Date: 07-02-2006
Squeezing quadrature rotation in the acoustic band via optomechanics
Publisher: IOP Publishing
Date: 22-02-2016
Space Qualification of Ultrafast Laser‐Written Integrated Waveguide Optics
Publisher: Wiley
Date: 28-12-2020
Radiation tolerance of two-dimensional material-based devices for space applications
Publisher: Springer Science and Business Media LLC
Date: 13-03-2019
DOI: 10.1038/S41467-019-09219-5
Abstract: Characteristic for devices based on two-dimensional materials are their low size, weight and power requirements. This makes them advantageous for use in space instrumentation, including photovoltaics, batteries, electronics, sensors and light sources for long-distance quantum communication. Here we present a comprehensive study on combined radiation effects in Earth’s atmosphere on various devices based on these nanomaterials. Using theoretical modeling packages, we estimate relevant radiation levels and then expose field-effect transistors, single-photon sources and monolayers as building blocks for future electronics to γ -rays, protons and electrons. The devices show negligible change in performance after the irradiation, suggesting robust suitability for space use. Under excessive γ -radiation, however, monolayer WS 2 shows decreased defect densities, identified by an increase in photoluminescence, carrier lifetime and a change in doping ratio proportional to the photon flux. The underlying mechanism is traced back to radiation-induced defect healing, wherein dissociated oxygen passivates sulfur vacancies.
Real time demonstration of high bitrate quantum random number generation with coherent laser light
Publisher: AIP Publishing
Date: 06-06-2011
DOI: 10.1063/1.3597793
Abstract: We present a random number generation scheme that uses broadband measurements of the vacuum field contained in the radio-frequency sidebands of a single-mode laser. Even though the measurements may contain technical noise, we show that suitable algorithms can transform the digitized photocurrents into a string of random numbers that can be made arbitrarily correlated with a subset of the quantum fluctuations (high quantum correlation regime) or arbitrarily immune to environmental fluctuations (high environmental immunity). We demonstrate up to 2 Gbps of real time random number generation that were verified using standard randomness tests.
A scalable, self-analyzing digital locking system for use on quantum optics experiments
Publisher: AIP Publishing
Date: 07-2011
DOI: 10.1063/1.3610455
Abstract: Digital control of optics experiments has many advantages over analog control systems, specifically in terms of the scalability, cost, flexibility, and the integration of system information into one location. We present a digital control system, freely available for download online, specifically designed for quantum optics experiments that allows for automatic and sequential re-locking of optical components. We show how the inbuilt locking analysis tools, including a white-noise network analyzer, can be used to help optimize in idual locks, and verify the long term stability of the digital system. Finally, we present an ex le of the benefits of digital locking for quantum optics by applying the code to a specific experiment used to characterize optical Schrödinger cat states.
QUANTUM SQUEEZING IN ADVANCED GRAVITATIONAL WAVE DETECTORS
Publisher: World Scientific Pub Co Pte Lt
Date: 09-2011
DOI: 10.1142/S0218271811020159
Abstract: Second generation ground-based gravitational wave detectors, scheduled to be operating by the middle of this decade, will be limited in sensitivity over much of their detection range by optical quantum noise. As they will be operating at power levels close to the tolerance of the optical components, significant further improvement in sensitivity will require the use of quantum optical techniques such as the injection of squeezed states. In this paper we briefly review squeezing and plans for its implementation into advanced gravitational wave detectors.
Gradient echo memory in an ultra-high optical depth cold atomic ensemble
Publisher: IOP Publishing
Date: 23-08-2013
A tight Cramér–Rao bound for joint parameter estimation with a pure two-mode squeezed probe
Publisher: Elsevier BV
Date: 08-2017
Room temperature single photon source using fiber-integrated hexagonal boron nitride
Publisher: IOP Publishing
Date: 29-06-2017
Molecular Mechanism for the Control of Eukaryotic Elongation Factor 2 Kinase by pH: Role in Cancer Cell Survival
Publisher: Informa UK Limited
Date: 05-2015
DOI: 10.1128/MCB.00012-15
Multimodal Properties and Dynamics of Gradient Echo Quantum Memory
Publisher: American Physical Society (APS)
Date: 13-11-2008
Polarization squeezing of continuous variable stokes parameters
Publisher: American Physical Society (APS)
Date: 13-02-2002
Gradient Echo Quantum Memory in Warm Atomic Vapor
Publisher: MyJove Corporation
Date: 11-11-2013
DOI: 10.3791/50552
ERRATUM: “BEATING THE SPIN-DOWN LIMIT ON GRAVITATIONAL WAVE EMISSION FROM THE CRAB PULSAR” (2008, ApJ, 683, L45)
Publisher: American Astronomical Society
Date: 06-11-2009
Quantum cryptography without switching
Publisher: American Physical Society (APS)
Date: 22-10-2004
Maximizing device-independent randomness from a Bell experiment by optimizing the measurement settings
Publisher: American Physical Society (APS)
Date: 05-07-2016
Rapid review protocol: Zinc for the prevention or treatment of COVID-19 and other coronavirus-related respiratory tract infections
Publisher: Elsevier BV
Date: 09-2020
Search for gravitational-wave bursts in LIGO data from the fourth science run
Publisher: IOP Publishing
Date: 24-10-2007
Observing the operational significance of discord consumption
Publisher: Springer Science and Business Media LLC
Date: 05-08-2012
DOI: 10.1038/NPHYS2376
Scattering-Free Optical Levitation of a Cavity Mirror
Publisher: American Physical Society (APS)
Date: 29-10-2013
Experimental demonstration of continuous variable polarization entanglement
Publisher: American Physical Society (APS)
Date: 04-12-2002
The PoWeR of exercise: Exploring the anti‐ageing effects of exercise through epigenetic modifications to skeletal muscle
Publisher: Wiley
Date: 11-03-2023
DOI: 10.1113/JP284288
No-Switching Quantum Key Distribution Using Broadband Modulated Coherent Light
Publisher: American Physical Society (APS)
Date: 28-05-2005
Dynamical observations of self-stabilizing stationary light
Publisher: Springer Science and Business Media LLC
Date: 26-09-2016
DOI: 10.1038/NPHYS3901
High Efficiency Gradient Echo Memory with 3-Level Atoms
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3630216
Photon-number discrimination without a photon counter and its application to reconstructing non-Gaussian states
Publisher: American Physical Society (APS)
Date: 28-11-2011
Measurement-based noiseless linear amplification for quantum communication
Publisher: SPIE
Date: 18-11-2014
DOI: 10.1117/12.2071884
Violation of Bell's Inequality Using Continuous Variable Measurements
Publisher: American Physical Society (APS)
Date: 25-01-2018
Quantum benchmarking with realistic states of light
Publisher: American Physical Society (APS)
Date: 27-08-2012
Unity gain and nonunity gain quantum teleportation
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2003
An investigation of doubly-resonant optical parametric oscillators and nonlinear crystals for squeezing
Publisher: IOP Publishing
Date: 16-12-2010
Fabrication of ultrahigh-precision hemispherical mirrors for quantum-optics applications
Publisher: Springer Science and Business Media LLC
Date: 09-01-2018
DOI: 10.1038/S41598-017-18637-8
Abstract: High precision, high numerical aperture mirrors are desirable for mediating strong atom-light coupling in quantum optics applications and can also serve as important reference surfaces for optical metrology. In this work we demonstrate the fabrication of highly-precise hemispheric mirrors with numerical aperture NA = 0.996. The mirrors were fabricated from aluminum by single-point diamond turning using a stable ultra-precision lathe calibrated with an in-situ white-light interferometer. Our mirrors have a diameter of 25 mm and were characterized using a combination of wide-angle single-shot and small-angle stitched multi-shot interferometry. The measurements show root-mean-square (RMS) form errors consistently below 25 nm. The smoothest of our mirrors has a RMS error of 14 nm and a peak-to-valley (PV) error of 88 nm, which corresponds to a form accuracy of λ /50 for visible optics.
Arbitrary unitary transformations on optical states using a quantum memory
Publisher: AIP Publishing LLC
Date: 2014
DOI: 10.1063/1.4903139
Spatial quantum effects with continuous-wave laser beams
Publisher: Informa UK Limited
Date: 20-03-2006
Utilising Glycobiology for Fluorescent Nanodiamond Uptake and Imaging in the Central Nervous System
Publisher: IEEE
Date: 06-2019
Quantum metrology for gravitational wave astronomy
Publisher: Springer Science and Business Media LLC
Date: 16-11-2010
DOI: 10.1038/NCOMMS1122
Abstract: Einstein's general theory of relativity predicts that accelerating mass distributions produce gravitational radiation, analogous to electromagnetic radiation from accelerating charges. These gravitational waves (GWs) have not been directly detected to date, but are expected to open a new window to the Universe once the detectors, kilometre-scale laser interferometers measuring the distance between quasi-free-falling mirrors, have achieved adequate sensitivity. Recent advances in quantum metrology may now contribute to provide the required sensitivity boost. The so-called squeezed light is able to quantum entangle the high-power laser fields in the interferometer arms, and could have a key role in the realization of GW astronomy.
Integrated photonic platform for quantum information with continuous variables
Publisher: American Association for the Advancement of Science (AAAS)
Date: 07-12-2018
Abstract: An integrated optical chip is used for generating, manipulating, and detecting squeezed vacuum and two-mode entanglement.
Harmonic Entanglement with Second-Order Nonlinearity
Publisher: American Physical Society (APS)
Date: 13-02-2006
Efficient computation of the Nagaoka–Hayashi bound for multiparameter estimation with separable measurements
Publisher: Springer Science and Business Media LLC
Date: 15-07-2021
DOI: 10.1038/S41534-021-00414-1
Abstract: Finding the optimal attainable precisions in quantum multiparameter metrology is a non-trivial problem. One approach to tackling this problem involves the computation of bounds which impose limits on how accurately we can estimate certain physical quantities. One such bound is the Holevo Cramér–Rao bound on the trace of the mean squared error matrix. The Holevo bound is an asymptotically achievable bound when one allows for any measurement strategy, including collective measurements on many copies of the probe. In this work, we introduce a tighter bound for estimating multiple parameters simultaneously when performing separable measurements on a finite number of copies of the probe. This makes it more relevant in terms of experimental accessibility. We show that this bound can be efficiently computed by casting it as a semidefinite programme. We illustrate our bound with several ex les of collective measurements on finite copies of the probe. These results have implications for the necessary requirements to saturate the Holevo bound.
Distinguishability of Gaussian states in quantum cryptography using postselection
Publisher: American Physical Society (APS)
Date: 15-06-2009
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