ORCID Profile
0000-0002-2006-2941
Current Organisations
Montana State University Bozeman
,
Australian National University
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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.
Quantum Information, Computation and Communication | Quantum Physics | Nonlinear Optics and Spectroscopy | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Condensed Matter Physics
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Technology | Expanding Knowledge in Engineering |
Publisher: American Physical Society (APS)
Date: 21-06-2019
Publisher: OSA
Date: 2017
Publisher: American Physical Society (APS)
Date: 07-03-2023
Publisher: American Geophysical Union (AGU)
Date: 11-01-2011
DOI: 10.1029/2009JB007174
Publisher: Wiley
Date: 18-08-2023
Abstract: Double‐negative refractive index materials have attracted sustained experimental and theoretical interest because they can display a range of surprising optical phenomena, including negative Doppler shifts and perfect lensing. Double‐negative indexes have been achieved experimentally in engineered metamaterials however, these materials become increasingly challenging to fabricate at shorter wavelengths, and at optical wavelengths only 2D negative index materials have been achieved. Here, it is shown that a double‐negative index can occur in a natural material, near narrow optical transitions of dielectric crystals stoichiometric in a rare‐earth ion. Optical measurements of two candidate materials, the magnetically‐ordered erbium crystals, ErCl 3 ·6H 2 O and 7 LiErF 4 , which have ultra‐narrow optical linewidths of 3 GHz and 250 MHz, respectively, in the telecom band are presented. It is shown that the spectral density of 7 LiErF 4 is sufficient to achieve a negative index at 1530 nm. This material can enable the exploration of negative refractive index effects at optical wavelengths in a truly 3D, natural medium.
Publisher: American Physical Society (APS)
Date: 27-06-2022
Publisher: IEEE
Date: 08-2011
Publisher: Elsevier BV
Date: 11-2013
Publisher: American Physical Society (APS)
Date: 09-12-2013
Publisher: American Physical Society (APS)
Date: 05-12-2016
Publisher: IOP Publishing
Date: 26-11-2018
Publisher: Springer Science and Business Media LLC
Date: 11-09-2017
DOI: 10.1038/NPHYS4254
Publisher: American Physical Society (APS)
Date: 12-01-2023
Publisher: Springer Science and Business Media LLC
Date: 2015
DOI: 10.1038/NATURE14025
Abstract: Space-like separation of entangled quantum states is a central concept in fundamental investigations of quantum mechanics and in quantum communication applications. Optical approaches are ubiquitous in the distribution of entanglement because entangled photons are easy to generate and transmit. However, extending this direct distribution beyond a range of a few hundred kilometres to a worldwide network is prohibited by losses associated with scattering, diffraction and absorption during transmission. A proposal to overcome this range limitation is the quantum repeater protocol, which involves the distribution of entangled pairs of optical modes among many quantum memories stationed along the transmission channel. To be effective, the memories must store the quantum information encoded on the optical modes for times that are long compared to the direct optical transmission time of the channel. Here we measure a decoherence rate of 8 × 10(-5) per second over 100 milliseconds, which is the time required for light transmission on a global scale. The measurements were performed on a ground-state hyperfine transition of europium ion dopants in yttrium orthosilicate ((151)Eu(3+):Y2SiO5) using optically detected nuclear magnetic resonance techniques. The observed decoherence rate is at least an order of magnitude lower than that of any other system suitable for an optical quantum memory. Furthermore, by employing dynamic decoupling, a coherence time of 370 ± 60 minutes was achieved at 2 kelvin. It has been almost universally assumed that light is the best long-distance carrier for quantum information. However, the coherence time observed here is long enough that nuclear spins travelling at 9 kilometres per hour in a crystal would have a lower decoherence with distance than light in an optical fibre. This enables some very early approaches to entanglement distribution to be revisited, in particular those in which the spins are transported rather than the light.
Publisher: IOP Publishing
Date: 28-03-2019
Publisher: AIP Publishing
Date: 03-2019
DOI: 10.1063/1.5080086
Abstract: Vibrations in cryocoolers are a recurrent concern to the end user. They appear in different parts of the acoustic spectrum depending on the refrigerator type, Gifford McMahon or pulse-tube, and with a variable coupling strength to the physical system under interest. Here, we use the piezospectroscopic effect in rare-earth doped crystals at a low temperature as a high resolution, contact-less probe for the vibrations. With this optical spectroscopic technique, we obtain and analyze the vibration spectrum up to 700 kHz of a 2 kW pulse-tube cooler. We attempt an absolute calibration based on known experimental parameters to make our method partially quantitative and to provide a possible comparison with other well-established techniques.
Publisher: OSA
Date: 2016
Publisher: American Physical Society (APS)
Date: 15-12-2016
Publisher: IOP Publishing
Date: 10-02-2015
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 27-08-2021
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 09-2010
Publisher: American Physical Society (APS)
Date: 22-11-2013
Publisher: IOP Publishing
Date: 09-03-2022
Abstract: In idual optical emitters coupled via coherent interactions are attractive qubits for quantum communications applications. Here, we present the first study of single pairs of interacting rare earth ions and determine the interactions between ions in the pair with high resolution. We identify two ex les of Er 3+ pair sites in Er implanted Si and characterise the interactions using optical Zeeman spectroscopy. We identify one pair as two Er 3+ ions in sites of at least C 2 symmetry coupled via a large, 200 GHz, Ising-like spin interaction in both optical ground and excited states. The high measurement resolution allows non-Ising contributions to the interaction of <?CDATA $ 1 % to be observed, attributed to site distortion. By bringing two optical transitions into resonance with a magnetic field, we observe a 0.8 GHz optical interaction of unusual magnetic-dipole/electric-dipole character with strong polarization selection rules. We discuss the use of this type of strongly coupled, field-tunable rare earth pair system for quantum processing.
Publisher: American Physical Society (APS)
Date: 05-11-2009
Publisher: American Physical Society (APS)
Date: 04-01-2016
Publisher: American Physical Society (APS)
Date: 09-01-2020
Publisher: American Physical Society (APS)
Date: 14-09-2015
Publisher: American Physical Society (APS)
Date: 30-03-2022
Start Date: 2017
End Date: 06-2020
Amount: $360,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2022
End Date: 12-2023
Amount: $1,173,128.00
Funder: Australian Research Council
View Funded ActivityStart Date: 04-2021
End Date: 12-2024
Amount: $515,000.00
Funder: Australian Research Council
View Funded Activity