ORCID Profile
0000-0003-4981-9730
Current Organisation
University of Technology Sydney
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Nonlinear Optics and Spectroscopy | Quantum Optics | Nanophotonics | Optical Physics | Photonics, Optoelectronics and Optical Communications | Nanotechnology | Nanofabrication, Growth and Self Assembly
Expanding Knowledge in the Physical Sciences | Energy Conservation and Efficiency not elsewhere classified | Expanding Knowledge in Technology |
Publisher: IOP Publishing
Date: 06-2022
Abstract: High-efficiency photon-pair production is a long-sought-after goal for many optical quantum technologies, and coherent photon conversion (CPC) processes are promising candidates for achieving this. We show theoretically how to control coherent conversion between a narrow-band pump photon and broadband photon pairs in nonlinear optical waveguides by tailoring frequency dispersion for broadband quantum frequency mixing. We reveal that complete deterministic conversion as well as pump-photon revival can be achieved at a finite propagation distance. We also find that high conversion efficiencies can be realised robustly over long propagation distances. These results demonstrate that dispersion engineering is a promising way to tune and optimise the CPC process.
Publisher: American Chemical Society (ACS)
Date: 31-10-2016
DOI: 10.1021/ACS.NANOLETT.6B03525
Abstract: The quest for nanoscale light sources with designer radiation patterns and polarization has motivated the development of nanoantennas that interact strongly with the incoming light and are able to transform its frequency, radiation, and polarization patterns. Here, we demonstrate dielectric AlGaAs nanoantennas for efficient second harmonic generation, enabling the control of both directionality and polarization of nonlinear emission. This is enabled by specialized III-V semiconductor nanofabrication of high-quality AlGaAs nanostructures embedded in optically transparent low-index material, thus allowing for simultaneous forward and backward nonlinear emission. We show that the nanodisk AlGaAs antennas can emit second harmonic in preferential direction with a backward-to-forward ratio of up to five and can also generate complex vector polarization beams, including beams with radial polarization.
Publisher: American Chemical Society (ACS)
Date: 14-04-2023
Publisher: AIP Publishing
Date: 25-12-2017
DOI: 10.1063/1.5008445
Abstract: Nonlinear optical waveguides enable the integration of entangled photon sources and quantum logic gates on a quantum photonic chip. One of the major challenges in such systems is separating the generated entangled photons from the pump laser light. In this work, we experimentally characterize double-N-shaped nonlinear optical adiabatic couplers designed for the generation of spatially entangled photon pairs through spontaneous parametric down-conversion, while simultaneously providing spatial pump filtering and keeping photon-pair states pure. We observe that the pump photons at a wavelength of 671 nm mostly remain in the central waveguide, achieving a filtering ratio of over 20 dB at the outer waveguides. We also perform classical characterization at the photon-pair wavelength of 1342 nm and observe that light fully couples from an input central waveguide to the outer waveguides, showing on chip separation of the pump and the photon-pair wavelength.
Publisher: Cambridge University Press (CUP)
Date: 06-01-2020
Publisher: The Optical Society
Date: 20-11-2017
Publisher: OSA
Date: 2016
Publisher: OSA
Date: 2017
Publisher: Optica Publishing Group
Date: 23-08-2022
DOI: 10.1364/OME.462981
Abstract: Nonclassical light sources are highly sought-after as they are an integral part of quantum communication and quantum computation devices. Typical sources use bulk nonlinear crystals that rely on stringent phase-matching conditions, limiting the operating wavelength and bandwidth. In this work, we demonstrate the generation of photon pairs from a free-standing lithium niobate microcube at the telecommunication wavelength of 1.56 µm through the spontaneous parametric down-conversion process. The maximum photon pair generation rate obtained from a single microcube with the size of 3.6 µm is 490 Hz, resulting in an efficiency of 20.6 GHz/Wm, which is three orders of magnitude larger than the efficiency of biphoton generation in bulk nonlinear crystals. The microcubes are synthesized through a solvothermal method, offering the possibility for scalable devices via bottom-up assembly on any substrates. Our work constitutes an important step forward in the realization of compact nonclassical light sources with a wide bandwidth for various quantum applications.
Publisher: American Physical Society (APS)
Date: 10-06-2013
Publisher: Springer Science and Business Media LLC
Date: 07-08-2012
DOI: 10.1038/SREP00562
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6NR09702B
Abstract: Recent progress in the study of resonant light confinement in high-index dielectric nanostructures suggests a new route for achieving efficient control of both electric and magnetic components of light. It also leads to the enhancement of nonlinear effects near electric and magnetic Mie resonances with an engineered radiation directionality. Here we study the third-harmonic generation from dimers composed of pairs of two identical silicon nanoparticles and demonstrate, both numerically and experimentally, that the multipolar harmonic modes generated by the dimers near the Mie resonances allow the shaping of the directionality of nonlinear radiation.
Publisher: IEEE
Date: 06-2014
Publisher: OSA
Date: 2017
Publisher: IEEE
Date: 08-2011
Publisher: Elsevier BV
Date: 06-2009
Publisher: OSA
Date: 2015
Publisher: AIP Publishing
Date: 02-2018
DOI: 10.1063/1.5009766
Abstract: Spontaneous parametric down-conversion (SPDC) spectroscopy using photon pairs is a promising avenue towards affordable mid-infrared (MIR) spectroscopy. Here, we experimentally investigate the feasibility of using periodically poled waveguides in lithium niobate for SPDC spectroscopy applications. We find the waveguides suitable to generate wavelength non-degenerate photon pairs with one photon in the MIR spectral range with high fluence. We use this to determine the cutoff wavelengths of the waveguide mode in the MIR by performing only measurements in the near-infrared spectral range.
Publisher: American Chemical Society (ACS)
Date: 12-05-2020
Publisher: AIP Publishing
Date: 12-03-2012
DOI: 10.1063/1.3696030
Abstract: We study the temporal dynamics of all-optical switching in nonlinear directional couplers in periodically poled lithium niobate. The characteristic features of such switching, including asymmetric pulse break-up and back-switching were measured in full agreement with the theoretical predictions. Based on the time-resolved measurement of intensity-dependent switching, finally the theoretically long-known continuous-wave switching curve has experimentally been confirmed.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 14-09-2018
Abstract: Metasurfaces should allow wafer-thin surfaces to replace bulk optical components. Two reports now demonstrate that metasurfaces can be extended into the quantum optical regime. Wang et al. determined the quantum state of multiple photons by simply passing them through a dielectric metasurface, scattering them into single-photon detectors. Stav et al. used a dielectric metasurface to generate entanglement between spin and orbital angular momentum of single photons. The results should aid the development of integrated quantum optic circuits operating on a nanophotonic platform. Science , this issue p. 1104 , p. 1101
Publisher: American Chemical Society (ACS)
Date: 10-09-2018
Publisher: Cambridge University Press (CUP)
Date: 23-12-2021
Abstract: Recent developments in neural networks have shown the potential of estimating drag on irregular rough surfaces. Nevertheless, the difficulty of obtaining a large high-fidelity dataset to train neural networks is deterring their use in practical applications. In this study, we propose a transfer learning framework to model the drag on irregular rough surfaces even with a limited amount of direct numerical simulations. We show that transfer learning of empirical correlations, reported in the literature, can significantly improve the performance of neural networks for drag prediction. This is because empirical correlations include ‘approximate knowledge’ of the drag dependency in high-fidelity physics. The ‘approximate knowledge’ allows neural networks to learn the surface statistics known to affect drag more efficiently. The developed framework can be applied to applications where acquiring a large dataset is difficult but empirical correlations have been reported.
Publisher: OSA
Date: 2016
Publisher: OSA
Date: 2016
Publisher: The Optical Society
Date: 10-11-2016
DOI: 10.1364/OL.41.005278
Publisher: American Association for the Advancement of Science (AAAS)
Date: 03-05-2019
Abstract: We demonstrate anti-Stokes excitation of single color centers in diamond for high-sensitivity, nanoscale temperature measurements.
Publisher: IOP Publishing
Date: 11-02-2020
Publisher: OSA
Date: 2014
Publisher: JMIR Publications Inc.
Date: 11-02-2019
DOI: 10.2196/10930
Publisher: OSA
Date: 2017
Publisher: AIP Publishing
Date: 06-06-2011
DOI: 10.1063/1.3597627
Abstract: We predict highly efficient third harmonic generation through simultaneous phase-matching of second-harmonic generation and sum-frequency generation in lithium niobate nanowaveguides, enabled due to strong modal dispersion. We demonstrate that the waveguide size which corresponds to phase-matching is also optimal for highest mode confinement and therefore for strongly enhanced conversion efficiency.
Publisher: The Optical Society
Date: 12-02-2018
DOI: 10.1364/PRJ.6.0000A6
Publisher: American Physical Society (APS)
Date: 31-03-2014
Publisher: The Optical Society
Date: 29-08-2016
DOI: 10.1364/OL.41.004079
Publisher: Wiley
Date: 26-11-2015
Publisher: OSA
Date: 2017
Publisher: Optica Publishing Group
Date: 23-03-2022
DOI: 10.1364/OL.454450
Abstract: High-purity single-photon sources (SPS) that can operate at room temperature are highly desirable for a myriad of applications, including quantum photonics and quantum key distribution. In this work, we realize an ultra-bright solid-state SPS based on an atomic defect in hexagonal boron nitride (hBN) integrated with a solid immersion lens (SIL). The SIL increases the source efficiency by a factor of six, and the integrated system is capable of producing over ten million single photons per second at room temperature. Our results are promising for practical applications of SPS in quantum communication protocols.
Publisher: The Optical Society
Date: 26-08-2015
DOI: 10.1364/OL.40.004078
Publisher: IEEE
Date: 05-2011
Publisher: Cambridge University Press (CUP)
Date: 08-11-2021
DOI: 10.1017/JFM.2021.850
Abstract: Inhomogeneous rough surfaces in which strips of roughness alternate with smooth-wall strips are known to generate large-scale secondary motions. Those secondary motions are strongest if the strip width is of the order of the half-channel height and they generate a spatial wall shear stress distribution whose mean value can significantly exceed the area-averaged mean value of a homogeneously smooth and rough surface. In the present paper it is shown that a parametric forcing approach (Busse & Sandham, J. Fluid Mech. , vol. 712, 2012, pp. 169–202 Forooghi et al. , Intl J. Heat Fluid Flow , vol. 71, 2018, pp. 200–209), calibrated with data from turbulent channel flows over homogeneous roughness, can capture the topological features of the secondary motion over protruding and recessed roughness strips (Stroh et al. , J. Fluid Mech. , vol. 885, 2020, R5). However, the results suggest that the parametric forcing approach roughness model induces a slightly larger wall offset when applied to the present heterogeneous rough-wall conditions. Contrary to roughness-resolving simulations, where a significantly higher resolution is required to capture roughness geometry, the parametric forcing approach can be applied with usual smooth-wall direct numerical simulation resolution resulting in less computationally expensive simulations for the study of localized roughness effects. Such roughness model simulations are employed to systematically investigate the effect of the relative roughness protrusion on the physical mechanism of secondary flow formation and the related drag increase. It is found that strong secondary motions present over spanwise heterogeneous roughness with geometrical height difference generally lead to a drag increase. However, the physical mechanism guiding the secondary flow formation, and the resulting secondary flow topology, is different for protruding roughness strips and recessed roughness strips separated by protruding smooth surface strips.
Publisher: The Optical Society
Date: 30-11-2016
DOI: 10.1364/OL.41.005604
Publisher: IOP Publishing
Date: 18-12-2015
DOI: 10.1088/0957-4484/27/6/065301
Abstract: Nonlinear optical nanoscale waveguides are a compact and powerful platform for efficient wavelength conversion. The free-standing waveguide geometry opens a range of applications in microscopy for local delivery of light, where in situ wavelength conversion helps to overcome various wavelength-dependent issues, such as biological tissue damage. In this paper, we present an original patterning method for high-precision fabrication of free-standing nanoscale waveguides based on lithium niobate, a material with a strong second-order nonlinearity and a broad transparency window covering the visible and mid-infrared wavelength ranges. The fabrication process combines electron-beam lithography with ion-beam enhanced etching and produces nanowaveguides with lengths from 5 to 50 μm, widths from 50 to 1000 nm and heights from 50 to 500 nm, each with a precision of few nanometers. The fabricated nanowaveguides are tested in an optical characterization experiment showing efficient second-harmonic generation.
Publisher: Springer Science and Business Media LLC
Date: 26-04-2021
Publisher: The Optical Society
Date: 02-10-2015
DOI: 10.1364/OL.40.004575
Publisher: OSA
Date: 2017
Publisher: SPIE
Date: 08-05-2018
DOI: 10.1117/12.2303613
Publisher: IEEE
Date: 08-2011
Publisher: Springer Science and Business Media LLC
Date: 12-01-2018
DOI: 10.1038/LSA.2017.143
Abstract: Integrated photonics is a leading platform for quantum technologies including nonclassical state generation 1, 2, 3, 4 , demonstration of quantum computational complexity 5 and secure quantum communications 6 . As photonic circuits grow in complexity, full quantum tomography becomes impractical, and therefore an efficient method for their characterization 7, 8 is essential. Here we propose and demonstrate a fast, reliable method for reconstructing the two-photon state produced by an arbitrary quadratically nonlinear optical circuit. By establishing a rigorous correspondence between the generated quantum state and classical sum-frequency generation measurements from laser light, we overcome the limitations of previous approaches for lossy multi-mode devices 9, 10 . We applied this protocol to a multi-channel nonlinear waveguide network and measured a 99.28±0.31% fidelity between classical and quantum characterization. This technique enables fast and precise evaluation of nonlinear quantum photonic networks, a crucial step towards complex, large-scale, device production.
Publisher: IEEE
Date: 07-2017
Publisher: American Physical Society (APS)
Date: 07-10-2015
Publisher: The Optical Society
Date: 27-11-2019
DOI: 10.1364/OL.44.005792
Publisher: OSA
Date: 2016
Publisher: Wiley
Date: 30-12-2022
DOI: 10.1111/IJFS.15530
Abstract: This study evaluated the physical parameters, polyphenol profile and antioxidant activity before and after the in vitro digestion of red pitaya powder‐enriched oat‐wheat bread compared to plain wheat bread, oat‐wheat bread and red pitaya powder. The enrichment of red pitaya powder significantly increased the polyphenol, mineral contents, insoluble dietary fibre, firmness and moisture content of oat‐wheat bread compared to wheat bread, while contributed to a minor reduction in bread volume and dough extensibility due to gluten dilution. The oat‐wheat bread was found to have the lowest predicted glycaemic response, but 5%, 10% and 15% red pitaya powder formulated oat‐wheat bread showed a significantly lower glycaemic response than plain wheat bread as well as red pitaya powder.
Publisher: American Chemical Society (ACS)
Date: 12-06-2020
Publisher: American Physical Society (APS)
Date: 17-05-2013
Publisher: ASME International
Date: 28-08-2017
DOI: 10.1115/1.4037280
Abstract: The effects of several surface parameters on equivalent sand roughness (ks) in fully rough regime are investigated by means of direct numerical simulation (DNS) of flow in channels with different wall geometries at Reτ≅500. The roughness geometry is generated by randomly distributing roughness elements of random size and prescribed shape on a flat surface. The roughness generation approach allows systematic variation of moments of surface height probability density function (PDF), size distribution of roughness peaks, and surface slope. A total number of 38 cases are solved. It is understood that a correlation based on surface height skewness and effective slope (ES) can satisfactorily predict ks normalized with maximum peak-to-valley roughness height within a major part of the studied parameter space. Such a correlation is developed based on the present data points and a number of complementary data points from the literature. It is also shown that the peak size distribution can independently influence the skin friction at fixed values of rms surface height, skewness, kurtosis, and ES, a surface with uniform size peaks causes higher skin friction compared to one with nonuniform peak sizes. Additionally, it is understood that a roughness generated by regular arrangement of roughness elements may lead to a significantly different skin friction compared to a random arrangement. A staggered and an aligned regular arrangement are examined in this paper and it is observed that the former produces significantly closer results to the corresponding random arrangement.
Publisher: The Optical Society
Date: 20-01-2014
DOI: 10.1364/OL.39.000462
Publisher: American Physical Society (APS)
Date: 10-09-2015
Publisher: Optica Publishing Group
Date: 26-08-2021
Abstract: Quantum emitters in hexagonal boron nitride (hBN) are emerging as bright and robust sources of single photons for applications in quantum optics. In this work we present detailed studies on the limiting factors to achieve Fourier transform limited spectral lines. Specifically, we study phonon dephasing and spectral diffusion of quantum emitters in hBN via resonant excitation spectroscopy at cryogenic temperatures. We show that the linewidths of hBN quantum emitters are phonon broadened, even at 5 K, with typical values of the order of ∼ 1 G H z . While spectral diffusion dominates at increasing pump powers, it can be minimized by working well below saturation excitation power. Our results are important for future utilization of quantum emitters in hBN for quantum interference experiments.
Publisher: American Physical Society (APS)
Date: 11-09-2015
Publisher: IEEE
Date: 12-2010
Publisher: OSA
Date: 2017
Publisher: OSA
Date: 2016
Publisher: The Optical Society
Date: 19-11-2012
DOI: 10.1364/OE.20.027441
Publisher: OSA
Date: 2016
Publisher: Cambridge University Press (CUP)
Date: 04-05-2022
DOI: 10.1017/JFM.2022.331
Abstract: Direct numerical simulations (DNS) are used to systematically investigate the applicability of the minimal-channel approach (Chung et al. , J. Fluid Mech. , vol. 773, 2015, pp. 418–431) for the characterization of roughness-induced drag on irregular rough surfaces. Roughness is generated mathematically using a random algorithm, in which the power spectrum (PS) and probability density function (p.d.f.) of the surface height can be prescribed. Twelve different combinations of PS and p.d.f. are examined, and both transitionally and fully rough regimes are investigated (roughness height varies in the range $k^+ = 25$ –100). It is demonstrated that both the roughness function ( ${\\rm \\Delta} U^+$ ) and the zero-plane displacement can be predicted with ${\\pm }5\\,\\%$ accuracy using DNS in properly sized minimal channels. Notably, when reducing the domain size, the predictions remain accurate as long as 90 % of the roughness height variance is retained. Additionally, examining the results obtained from different random realizations of roughness shows that a fixed combination of p.d.f. and PS leads to a nearly unique ${\\rm \\Delta} U^+$ for deterministically different surface topographies. In addition to the global flow properties, the distribution of time-averaged surface force exerted by the roughness onto the fluid is calculated. It is shown that patterns of surface force distribution over irregular roughness can be well captured when the sheltering effect is taken into account. This is made possible by applying the sheltering model of Yang et al. ( J. Fluid Mech. , vol. 789, 2016, pp. 127–165) to each specific roughness topography. Furthermore, an analysis of the coherence function between the roughness height and the surface force distributions reveals that the coherence drops at larger streamwise wavelengths, which can be an indication that very large horizontal scales contribute less to the skin-friction drag.
Publisher: IEEE
Date: 05-2013
Publisher: The Optical Society
Date: 11-2011
DOI: 10.1364/OE.19.023188
Publisher: The Optical Society
Date: 11-02-2014
DOI: 10.1364/OL.39.000953
Publisher: AIP
Date: 2012
DOI: 10.1063/1.4750102
Publisher: OSA
Date: 2018
Publisher: OSA
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 04-12-2017
DOI: 10.1038/S41598-017-17094-7
Abstract: Spontaneous parametric down-conversion (SPDC) is a widely used method to generate entangled photons, enabling a range of applications from secure communication to tests of quantum physics. Integrating SPDC on a chip provides interferometric stability, allows to reduce a physical footprint, and opens a pathway to true scalability. However, dealing with different photon polarizations and wavelengths on a chip presents a number of challenging problems. In this work, we demonstrate an on-chip polarization beam-splitter based on z-cut titanium-diffused lithium niobate asymmetric adiabatic couplers (AAC) designed for integration with a type-II SPDC source. Our experimental measurements reveal unique polarization beam-splitting regime with the ability to tune the splitting ratios based on wavelength. In particular, we measured a splitting ratio of 17 dB over broadband regions ( nm) for both H- and V-polarized lights and a specific 50%/50% splitting ratio for a cross-polarized photon pair from the AAC. The results show that such a system can be used for preparing different quantum polarization-path states that are controllable by changing the phase-matching conditions in the SPDC over a broad band. Furthermore, we propose a fully integrated electro-optically tunable type-II SPDC polarization-path-entangled state preparation circuit on a single lithium niobate photonic chip.
Publisher: Springer Science and Business Media LLC
Date: 06-02-2010
Publisher: American Physical Society (APS)
Date: 25-04-2018
Publisher: AIP Publishing
Date: 03-2020
DOI: 10.1063/1.5144119
Abstract: We formulate theoretically and demonstrate experimentally an all-optical method for reconstruction of the litude, phase, and coherence of frequency combs from a single-shot measurement of the spectral intensity. Our approach exploits synthetic frequency lattices with pump-induced spectral short- and long-range couplings between different signal components across a broad bandwidth of hundreds of GHz in a single nonlinear fiber. When combined with ultra-fast signal conversion techniques, this approach has the potential to provide real-time measurement of pulse-to-pulse variations in the spectral phase and coherence properties of exotic light sources.
Publisher: OSA
Date: 2018
Publisher: Optica Publishing Group
Date: 24-01-2022
DOI: 10.1364/PRJ.445728
Abstract: Squeezed light is a critical resource in quantum sensing and information processing. Due to the inherently weak optical nonlinearity and limited interaction volume, considerable pump power is typically needed to obtain efficient interactions to generate squeezed light in bulk crystals. Integrated photonics offers an elegant way to increase the nonlinearity by confining light strictly inside the waveguide. For the construction of large-scale quantum systems performing many-photon operations, it is essential to integrate various functional modules on a chip. However, fabrication imperfections and transmission cross talk may add unwanted diffraction and coupling to other photonic elements, reducing the quality of squeezing. Here, by introducing the topological phase, we experimentally demonstrate the topologically protected nonlinear process of four-wave mixing, enabling the generation of squeezed light on a silica chip. We measure the cross-correlations at different evolution distances for various topological sites and verify the nonclassical features with high fidelity. The squeezing parameters are measured to certify the protection of cavity-free, strongly squeezed states. The demonstration of topological protection for squeezed light on a chip brings new opportunities for quantum integrated photonics, opening novel approaches for the design of advanced multi-photon circuits.
Publisher: Springer Science and Business Media LLC
Date: 15-06-2021
Publisher: OSA
Date: 2018
Publisher: AIP Publishing
Date: 05-2017
DOI: 10.1063/1.4982879
Abstract: We demonstrate experimentally Bloch oscillations, which occur above a certain threshold value of the effective potential gradient in lattices with specially modulated coupling between the neighboring sites. We formulate the general conditions for this phenomenon, arising due to the competition between the tilting and broadening of the transmission band, and explain why no threshold was present in any previous observations. Our experiments are performed in inhomogeneous photonic lattices, which represent the process of quantum two-mode squeezing in Fock space, underpinning a fundamental quantum-classical correspondence.
Publisher: American Physical Society (APS)
Date: 21-10-2014
Publisher: SPIE
Date: 31-08-2015
DOI: 10.1117/12.2190266
Publisher: Elsevier BV
Date: 09-2014
Publisher: Optica Publishing Group
Date: 22-01-2021
DOI: 10.1364/OL.416564
Abstract: Hexagonal boron nitride (hBN) is a layered dielectric material with a wide range of applications in optics and photonics. In this work, we demonstrate a fabrication method for few-layer hBN flakes with areas up to 5000 µ m 2 . We show that hBN in this form can be integrated with photonic microstructures: as an ex le, we use a circular Bragg grating (CBG). The layer quality of the exfoliated hBN flake on and off a CBG is confirmed by Raman spectroscopy and second-harmonic generation (SHG) microscopy. We show that the SHG signal is uniform across the hBN s le outside the CBG and is lified in the center of the CBG.
Publisher: The Optical Society
Date: 25-01-2022
DOI: 10.1364/OE.27.001632
Publisher: The Optical Society
Date: 03-02-2012
DOI: 10.1364/OL.37.000446
Publisher: The Optical Society
Date: 04-11-2019
Publisher: IEEE
Date: 05-2011
Publisher: American Physical Society (APS)
Date: 14-07-2014
Publisher: IEEE
Date: 05-2011
Publisher: OSA
Date: 2018
Publisher: OSA
Date: 2015
Publisher: Wiley
Date: 29-01-2023
Abstract: Among the most prominent effects resulting from nonlinear light–matter interaction is the generation of correlated and entangled photons through various processes, notably via spontaneous parametric down‐conversion or spontaneous four‐wave mixing. Such nonlinear optical processes benefit from the concentration of electromagnetic fields in small volumes. Dielectric nanoresonators and their 2D layouts—metasurfaces—provide efficient ways to control light in subwavelength volumes enabling the enhancement of nonlinear light–matter interaction and the generation of entangled photons. Nanoresonators and metasurfaces offer a radical miniaturization of quantum light sources allowing better scalability, which opens a pathway toward arrangements of photon sources in complex subwavelength configurations for advanced photon state control. In this work, the recent progress in this emergent area of research is reviewed.
Publisher: OSA
Date: 2017
Publisher: AIP Publishing
Date: 12-08-2019
DOI: 10.1063/1.5099631
Abstract: Solid-state quantum emitters are garnering a lot of attention due to their role in scalable quantum photonics. A notable majority of these emitters, however, exhibit spectral diffusion due to local, fluctuating electromagnetic fields. In this work, we demonstrate efficient anti-Stokes (AS) excitation of quantum emitters in hexagonal boron nitride (hBN) and show that the process results in the suppression of a specific mechanism responsible for spectral diffusion of the emitters. We also demonstrate an all-optical gating scheme that exploits Stokes and anti-Stokes excitation to manipulate spectral diffusion so as to switch and lock the emission energy of the photon source. In this scheme, reversible spectral jumps are deliberately enabled by pumping the emitter with high energy (Stokes) excitation AS excitation is then used to lock the system into a fixed state characterized by a fixed emission energy. Our results provide important insights into the photophysical properties of quantum emitters in hBN and introduce a strategy for controlling the emission wavelength of quantum emitters.
Publisher: OSA
Date: 2015
Publisher: American Physical Society (APS)
Date: 10-01-2012
Publisher: American Chemical Society (ACS)
Date: 09-06-2015
Publisher: Elsevier BV
Date: 02-2020
Publisher: IEEE
Date: 07-2017
Publisher: American Chemical Society (ACS)
Date: 24-02-2021
Publisher: IEEE
Date: 05-2011
Publisher: Elsevier BV
Date: 11-2017
Publisher: Wiley
Date: 22-06-2023
Abstract: Quantum key distribution (QKD) is considered the most immediate application to be widely implemented among a variety of potential quantum technologies. QKD enables sharing secret keys between distant users by using photons as information carriers. An ongoing endeavor is to implement these protocols in practice in a robust, and compact manner so as to be efficiently deployable in a range of real‐world scenarios. Single photon sources (SPS) in solid‐state materials are prime candidates in this respect. This article demonstrates a room temperature, discrete‐variable quantum key distribution system using a bright single photon source in hexagonal‐boron nitride, operating in free‐space. Employing an easily interchangeable photon source system, keys with one million bits length, and a secret key of approximately 70000 bits, at a quantum bit error rate of 6%, with ε‐security of 10 −10 are generated. This study demonstrates the first proof of concept finite‐key BB84 QKD system realized with hBN defects.
Publisher: IOP Publishing
Date: 06-2017
Publisher: IOP Publishing
Date: 26-08-2015
Publisher: OSA
Date: 2015
Publisher: IEEE
Date: 09-2013
Publisher: Springer Science and Business Media LLC
Date: 20-07-2020
DOI: 10.1038/S41377-020-0299-7
Abstract: Geometrical dimensionality plays a fundamentally important role in the topological effects arising in discrete lattices. Although direct experiments are limited by three spatial dimensions, the research topic of synthetic dimensions implemented by the frequency degree of freedom in photonics is rapidly advancing. The manipulation of light in these artificial lattices is typically realized through electro-optic modulation yet, their operating bandwidth imposes practical constraints on the range of interactions between different frequency components. Here we propose and experimentally realize all-optical synthetic dimensions involving specially tailored simultaneous short- and long-range interactions between discrete spectral lines mediated by frequency conversion in a nonlinear waveguide. We realize triangular chiral-tube lattices in three-dimensional space and explore their four-dimensional generalization. We implement a synthetic gauge field with nonzero magnetic flux and observe the associated multidimensional dynamics of frequency combs, all within one physical spatial port. We anticipate that our method will provide a new means for the fundamental study of high-dimensional physics and act as an important step towards using topological effects in optical devices operating in the time and frequency domains.
Publisher: The Optical Society
Date: 02-08-2013
DOI: 10.1364/OE.21.019012
Publisher: OSA
Date: 2015
Publisher: OSA
Date: 2018
Location: Russian Federation
Start Date: 2016
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 2020
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 12-2023
Amount: $368,446.00
Funder: Australian Research Council
View Funded ActivityStart Date: 04-2016
End Date: 06-2019
Amount: $521,200.00
Funder: Australian Research Council
View Funded Activity