A5086216547- Photonic and Optical Devices
- Quantum Information and Cryptography
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Topological Materials and Phenomena
- Neural Networks and Reservoir Computing
- Quantum optics and atomic interactions
- Photorefractive and Nonlinear Optics
- Phase-change materials and chalcogenides
- Optical Network Technologies
- Nonlinear Optical Materials Studies
- Advanced Fluorescence Microscopy Techniques
- Chalcogenide Semiconductor Thin Films
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Random lasers and scattering media
- Silicon Nanostructures and Photoluminescence
- Orbital Angular Momentum in Optics
- Laser-Matter Interactions and Applications
- Advanced Photonic Communication Systems
- Advanced Optical Sensing Technologies
- Semiconductor Lasers and Optical Devices
- Ocular Surface and Contact Lens
- Optical Coherence Tomography Applications
Xanadu Quantum Technologies (Canada)
2019-2025
Macquarie University
2016-2020
Pennsylvania State University
2016-2018
Centre for Ultrahigh Bandwidth Devices for Optical Systems
2011-2016
The University of Sydney
2007-2015
Abstract A quantum computer attains computational advantage when outperforming the best classical computers running best-known algorithms on well-defined tasks. No photonic machine offering programmability over all its gates has demonstrated advantage: previous machines 1,2 were largely restricted to static gate sequences. Earlier demonstrations also vulnerable spoofing 3 , in which heuristics produce samples, without direct simulation, lying closer ideal distribution than do samples from...
The non-deterministic nature of photon sources is a key limitation for single-photon quantum processors. Spatial multiplexing overcomes this by enhancing the heralded yield without output noise. Here intrinsic statistical limit an individual source surpassed spatially two monolithic silicon-based correlated pair in telecommunications band, demonstrating 62.4% increase unwanted multipair generation. We further demonstrate scalability scheme photons generated waveguides pumped via integrated...
One-dimensional models with topological band structures represent a simple and versatile platform to demonstrate novel concepts. Here we experimentally study topologically protected states in silicon at the interface between two dimer chains different Zak phases. Furthermore, propose that, system where trivial defect modes coexist, can probe them independently. Tuning configuration of interface, observe transition single compound state. These results provide new paradigm for waveguiding...
Photonics offers a promising platform for quantum computing1–4, owing to the availability of chip integration mass-manufacturable modules, fibre optics networking and room-temperature operation most components. However, experimental demonstrations are needed complete integrated systems comprising all basic functionalities universal fault-tolerant operation5. Here we construct (sub-performant) scale model computer using 35 photonic chips demonstrate its functionality feasibility. This...
Nanophotonic resonators can generate broadband quadrature squeezing and single temporal mode photon number difference squeezing.
It is a fundamental challenge in quantum optics to deterministically generate indistinguishable single photons through non-deterministic nonlinear optical processes, due the intrinsic coupling of single- and multi-photon generation probabilities these processes. Actively multiplexing generated many temporal modes can decouple probabilities, but key issues are minimize resource requirements allow scalability, ensure indistinguishability photons. We demonstrate from four solely using...
Abstract Entangled multiphoton states lie at the heart of quantum information, computing, and communications. In recent years, topology has risen as a new avenue to robustly transport in presence fabrication defects, disorder, other noise sources. Whereas topological protection single photons correlated been recently demonstrated experimentally, observation topologically protected entangled thus far remained elusive. Here, we experimentally demonstrate spatially biphoton states. We observe...
Abstract A key resource for quantum optics experiments is an on‐demand source of single and multiple photon states at telecommunication wavelengths. This letter presents a heralded based on hybrid technology approach, combining high efficiency periodically poled lithium niobate waveguides, low‐loss laser inscribed circuits, fast (>1 MHz) fibre coupled electro‐optic switches. Hybrid interfacing different platforms promising route to exploiting the advantages existing has permitted...
Developing quantum computing relies on realizing controllable nonclassical states of light or matter. Researchers show that photon pairs can feature strong entanglement and reconfigurable correlations.
In this Letter we demonstrate frequency conversion in the single-photon regime through Bragg-scattering four-wave mixing with near-unit efficiency a 750 m long commercially available dispersion-engineered highly nonlinear fiber, where all photons and pump laser frequencies are low-loss telecommunications band. We achieve 99.1%±4.9% downconversion 98.0%±5.0% upconversion of by 12 nm using weak coherent state an average input 0.27 per detection gate window.
Single photons are of paramount importance to future quantum technologies, including communication and computation. Nonlinear photonic devices using parametric processes offer a straightforward route generating photons, however additional nonlinear may come into play interfere with these sources. Here we analyse spontaneous four-wave mixing (SFWM) sources in the presence multi-photon processes. We conduct experiments silicon gallium indium phosphide crystal waveguides which display...
We demonstrate low Raman-noise correlated photon-pair generation in a dispersion-engineered 10 mm As2S3 chalcogenide waveguide at room temperature. show coincidence-to-accidental ratio (CAR) of 16.8, 250 times increase compared with previously published results waveguide, corresponding brightness 3×10(5) pairs·s(-1)·nm(-1) generated the chip. Dispersion engineering our enables photon passbands to be placed spontaneous Raman scattering (SpRS) window 7.4 THz detuning from pump. This Letter...
In this Letter we demonstrate heralded single-photon generation in a III-V semiconductor photonic crystal platform through spontaneous four-wave mixing. We achieve high brightness of 3.4×10(7) pairs·s(-1) nm(-1) W(-1) facilitated dispersion engineering and the suppression two-photon absorption gallium indium phosphide material. Photon pairs are generated with coincidence-to-accidental ratio over 60 low g(2) (0) 0.06 proving nonclassical operation single photon regime.
We classically measure the entire propagation matrix of a few-mode fiber and use spatial light modulator to undo modal mixing recover single-photons launched onto each eigenmodes at one end, but arriving as mixed superpositions other. exploit orthogonality these channels improve isolation between quantum classical channel different polarization modes wavelengths. The diversity provides an additional 35dB in addition that provided by wavelength.
Graphene and boron nitride are two-dimensional materials whose atoms arranged in a honeycomb lattice. Their unique properties arise because their electrons behave like relativistic particles (without with mass, respectively)---namely, they obey the Dirac equation. Here, we use photonic analog of to observe physics silicon integrated optical platform. This will allow for applications dispersions (gapped ungapped) be realized an on-chip, nanophotonic
Photon-number resolving transition-edge sensors (TESs) with near unity system detection efficiency enable novel approaches to quantum computing, for example, heralding robust Gottesman–Kitaev–Preskill qubit states. Increasing the speed of detectors increases rate at which these states can be heralded. In addition, depending on details scheme, faster reduce complexities hardware implementation. previous work, we demonstrated that adding a small amount gold between tungsten film and silicon...
We demonstrate integrated spatial multiplexing of heralded single photons generated from a 96 μm long silicon photonic crystal waveguide in bidirectional pump configuration. By using low-loss fiber-coupled opto-ceramic switch, the technique enhances brightness photon source by 51.2±4.0% while maintaining coincidence-to-accidental ratio. Compared with demonstration two individual sources, scheme represents twofold reduction footprint nonlinear devices for future large-scale integration...
We report the characterization of correlated photon pairs generated in dispersion-engineered silicon slow-light photonic crystal waveguides pumped by picosecond pulses. found that taking advantage 15 nm flat-band window (vg ~ c/30) bandwidth for photon-pair generation 96 and 196 \mum long was at least 11.2 nm; while a 396 waveguide reduced to 8 (only half due increased impact phase matching longer waveguide). The key metrics source: coincidence accidental ratio (CAR) pair brightness were...
We demonstrate a sub-centimeter spatial resolution fiber-based distributed temperature sensor with enhanced measurement accuracy and reduced acquisition time. Our approach employs time domain analysis of backscattered Stokes anti-Stokes photons generated via spontaneous Raman scattering in chalcogenide (ChG) As2S3 fiber for monitoring. The performance is significantly improved by exploiting the high coefficient increased refractive index ChG fiber. achieve uncertainty ± 0.65 °C short only 5...
In this paper we investigate uncorrelated noise from spontaneous Raman scattering (SpRS) and its effect on photon-pair generation in chalcogenide (As2S3). We measure a coincidence-to-accidental ratio (CAR) of 4.2 7 cm As2S3 single-mode fiber, with enhancements our previous result attributed to pulsed pumping cooling. Using an analytical model characterize the magnitude SpRS at different temperatures. Our analysis shows that even after cooling liquid nitrogen temperature (77 K), is still...
We investigate the generation of random numbers via quantum process spontaneous Raman scattering. Spontaneous photons are produced by illuminating a highly nonlinear chalcogenide glass (As2S3) fiber with CW laser at power well below stimulated threshold. Single collected and separated into two discrete wavelength detuning bins equal scattering probability. The sequence photon detection clicks is converted bit stream. Postprocessing applied to remove detector bias, resulting in final rate...