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arXiv 2023年

作者： Burridge, Ben M. Faruque, Imad I. Rarity, John G. Barreto, Jorge Quantum Engineering Technology Laboratories University of Bristol Bristol United Kingdom Quantum Engineering Centre for Doctoral Training Centre for Nanoscience & Quantum Information University of Bristol Bristol United Kingdom

Integrated photonics is a powerful contender in the race for a fault-tolerant quantum computer, claiming to be a platform capable of scaling to the necessary number of qubits. This necessitates the use of high-quality quantum states, which we create here using an all-around high-performing photon source on an integrated photonics platform. We use a photonic molecule architecture and broadband directional couplers to protect against fabrication tolerances and ensure reliable operation. As a result, we simultaneously measure a spectral purity of 99.1 ± 0.1 %, a pair generation rate of 4.4 ± 0.1 MHz mW−2, and an intrinsic source heralding efficiency of 94.0 ± 2.9 %. We also see a maximum coincidence-to-accidental ratio of 1644 ± 263. We claim over an order of magnitude improvement in the trivariate trade-off between source heralding efficiency, purity and brightness. Future implementations of the source could achieve in excess of 99 % purity and heralding efficiency using state-of-the-art propagation losses. © 2023, CC BY-NC-ND.

关键词： Efficiency

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Using quantum Cheshire Cats to explore Contextuality and quantum Coherence

Using Quantum Cheshire Cats to explore Contextuality and Qua...

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quantum 2.0, quantum 2024 in quantum 2.0 Conference and Exhibition

作者： Hance, Jonte R. Ji, Ming Hofmann, Holger F. School of Computing Newcastle University 1 Science Square Newcastle upon TyneNE4 5TG United Kingdom Department of Quantum Matter Graduate School of Advanced Science and Engineering Hiroshima University Kagamiyama 1-3-1 Higashi Hiroshima739-8530 Japan Quantum Engineering Technology Laboratories Department of Electrical and Electronic Engineering University of Bristol Woodland Road BristolBS8 1US United Kingdom

We analyse the quantum Cheshire cat using contextuality theory. The results shed a surprising new light on the relation between quantum paradoxes, weak values, and contextuality, a key resource for quantum computing. ... 详细信息

ISBN: (纸本)9781557525185

关键词： quantum computers

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Exchange-Free Polarimetry of a Polarising Object

Exchange-Free Polarimetry of a Polarising Object

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Optical Sensors, Sensors 2022

作者： Hance, Jonte R. Rarity, John Quantum Engineering Technology Laboratories Department of Electrical and Electronic Engineering University of Bristol Woodland Road BristolBS8 1US United Kingdom

We extend exchange-free imaging to polarimetry of a polarising object. This allows imaging of these samples with far less absorbed energy - a key concern when imaging with high-frequency radiation. © 2022 The Aut... 详细信息

ISBN: (纸本)9781557528209

关键词： Polarimeters

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Programmable Photonic Nonlinearity for quantum Simulation

Programmable Photonic Nonlinearity for Quantum Simulation

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and Optical Communications, IPOC 2024

作者： Wang, Ying Nielsen, Kasper H. Deacon, Edward Sund, Patrik I. Liu, Zhe Scholz, Sven Ludwig, Arne Midolo, Leonardo Sørensen, Anders S. Paesani, Stefano Lodahl, Peter Niels Bohr Institute University of Copenhagen Blegdamsvej 17 Copenhagen2100 Denmark Quantum Engineering and Technology Laboratories School of Physics Department of Electrical and Electronic Engineering University of Bristol Bristol United Kingdom Lehrstuhl für Angewandte Festkörperphysik Ruhr-Universität Bochum Universitätsstrasse 150 BochumD-44780 Germany NNF Quantum Computing Programme Niels Bohr Institute University of Copenhagen Blegdamsvej 17 Copenhagen2100 Denmark

ISBN: (纸本)9798350379266

Light-matter interaction at the quantum level provides a versatile interface driving photonic quantum technologies toward practical applications. We demonstrate multi-mode photonic circuits that enable precise programming of linear and nonlinear phase configurations at the single-photon level. The nonlinearity operation is realized using a solid-state quantum emitter, a self-assembled quantum dot, integrated into a nanophotonic device. The quantum dot interfaces with a temporal linear optical interferometer, creating a programmable nonlinear photonic platform that is necessary for implementing quantum protocols that require strong nonlinearities, such as the quantum simulation of anharmonic molecular dynamics. © 2024 IEEE.

关键词： Nanocrystals

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Heralded generation of entanglement with photons

arXiv

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arXiv 2025年

作者： Forbes, Imogen Ghafari, Farzad Deacon, Edward C.R. Singh, Sukhjit P. Lavie, Emilien Yard, Patrick Shaw, Reece D. Laing, Anthony Tischler, Nora Quantum Engineering and Technology Laboratories School of Physics Department of Electrical and Electronic Engineering University of Bristol BristolBS8 1TL United Kingdom Centre for Quantum Dynamics Griffith University Yuggera Country BrisbaneQLD4111 Australia

Entangled states of photons form the backbone of many quantum technologies. Due to the lack of effective photon-photon interactions, the generation of these states is typically probabilistic. In the prevailing but fundamentally limited generation technique, known as postselection, the target photons are measured destructively in the generation process. By contrast, in the alternative approach—heralded state generation—the successful creation of a desired state is verified by the detection of ancillary photons. Heralded state generation is superior to postselection in several critical ways: It enables free usage of the prepared states, allows for the success probability to be arbitrarily increased via multiplexing, and provides a scalable route to quantum information processing using photons. Here, we review theoretical proposals and experimental realizations of heralded entangled photonic state generation, as well as the impact of realistic experimental errors. We then discuss the wide-ranging applications of these states for quantum technologies, including resource states in linear optical quantum computing, entanglement swapping for repeater networks, fundamental physics, and quantum metrology. Copyright © 2025, The Authors. All rights reserved.

关键词： quantum computers

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Chiral phonon activated spin Seebeck effect in chiral materials

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 149-155页

作者： Xiao Li Jinxin Zhong Jinluo Cheng Hao Chen Huiqian Wang Jun Liu Dali Sun Lifa Zhang Jun Zhou Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy ScienceSchool of Physics and TechnologyNanjing Normal UniversityNanjing 210023China Center for Phononics and Thermal Energy Science China-EU Joint Lab for NanophononicsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of ScienceChangchun 130033China Department of Mechanical and Aerospace Engineering North Carolina State UniversityRaleigh NC 27606USA Department of Physics North Carolina State UniversityRaleigh NC 27695USA Organic and Carbon Electronics Laboratories(ORaCEL) North Carolina State UniversityRaleigh NC 27606USA

Efficient generation of spin polarization is very important for spintronics and quantum computation. In chiral materials without magnetic order nor spin-orbit coupling, we find a new spin selectivity effect—chiral phonon activated spin Seebeck(CPASS)effect. Starting with the nonequilibrium distribution of chiral phonons under a temperature gradient, the CPASS coefficients are computed based on the Boltzmann transport theory. With both the phonon-drag and band transport contributions, the spin accumulations generated by the CPASS effect exhibit quadratic dependence on the temperature gradient. The strength of the CPASS effect and the relative magnitude of both contributions are tunable by the chemical potential modulation. The CPASS effect, which gives a promising explanation on the traditional chiral-induced spin selectivity effect, provides opportunities for the exploration of advanced spintronic devices based on chiral materials even in the absence of any magnetic order and spin-orbit coupling.

关键词： spin Seebeck effect chiral phonon phonon-drag contribution efficient spin generation

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Counterfactual Polarimetry of a Polarising Object

Counterfactual Polarimetry of a Polarising Object

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Jonte R. Hance John Rarity Department of Electrical and Electronic Engineering Quantum Engineering Technology Laboratories University of Bristol Bristol UK

We extend counterfactual imaging to polarimetry of a polarising object. This allows imaging of these samples with far less absorbed energy - a key concern when imaging with high-frequency radiation.

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Multifunctional SnO_(2) QDs/MXene Heterostructures as Laminar Interlayers for Improved Polysulfide Conversion and Lithium Plating Behavior

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Nano-Micro Letters 2024年第11期16卷 156-169页

作者： Shungui Deng Weiwei Sun Jiawei Tang Mohammad Jafarpour Frank Nüesch Jakob Heier Chuanfang Zhang College of Materials Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China Laboratory for Functional Polymers Swiss Federal Laboratories for Materials Science and Technology(EMPA)Überlandstrasse 1298600 DübendorfSwitzerland Institute of Materials Science and Engineering Ecole Polytechnique Fédérale de Lausanne(EPFL)Station 121015 LausanneSwitzerland Key Laboratory of Quantum Materials and Devices of Ministry of Education School of PhysicsSoutheast UniversityNanjing 211189People’s Republic of China SEU‑FEI Nano‑Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096People’s Republic of China

Poor cycling stability in lithium–sulfur(Li–S)batteries necessitates advanced electrode/electrolyte design and innovative interlayer *** catalysis has emerged as a promising approach,leveraging the adsorption and catalytic performance on lithium polysulfides(LiPSs)to inhibit LiPSs shuttling and improve redox *** this study,we report an ultrathin and laminar SnO_(2)@MXene heterostructure interlayer(SnO_(2)@MX),where SnO_(2) quantum dots(QDs)are uniformly distributed across the MXene *** combined structure of SnO_(2) QDs and MXene,along with the creation of numerous active boundary sites with coordination electron environments,plays a critical role in manipulating the catalytic kinetics of sulfur *** Li–S cell with the SnO_(2)@MX-modified separator not only demonstrates superior electrochemical performance compared to cells with a bare separator but also induces homogeneous Li deposition during *** a result,an areal capacity of 7.6 mAh cm^(-2) under a sulfur loading of 7.5 mg cm^(-2) and a high stability over 500 cycles are *** work demonstrates a feasible strategy of utilizing a laminar separator interlayer for advanced Li–S batteries awaiting commercialization and may shed light on the understanding of heterostructure catalysis with enhanced reaction kinetics.

关键词： Lithium-sulfur battery Heterogeneous catalysis Heterostructure Redox kinetics Lithium dendrites

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Visible Multi-Wavelength Combiner and Power Splitter for Optical Lattice Clocks with Silica Planar Lightwave Circuit 16

Visible Multi-Wavelength Combiner and Power Splitter for Opt...

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16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Konisho, Shiori Sakamoto, Junji Imai, Hiromitsu Akatsuka, Tomoya Katori, Hidetoshi Oguri, Katsuya Hashimoto, Toshikazu Sogawa, Tetsuomi Ntt Corporation Ntt Device Technology Laboratories 3-1 Morinosato Wakamiya Kanagawa Atsugi Japan Ntt Corporation Ntt Basic Research Laboratories 3-1 Morinosato Wakamiya Kanagawa Atsugi Japan Riken Quantum Metrology Laboratory 2-1 Hirosawa Saitama Wako Japan Graduate School of Engineering The University of Tokyo Department of Applied Physics 2-11-16 Yayoi Bunkyo-ku Tokyo Japan Ntt Corporation Ntt Science and Core Technology Laboratory Group 3-1 Morinosato Wakamiya Kanagawa Atsugi Japan

We fabricated a visible multi-wavelength combiner and power splitter for optical lattice clocks (OLC) using a silica planar lightwave circuit. Magneto-optical trap was observed, which represents an important first ste... 详细信息

ISBN: (纸本)9798350372076

关键词： Optical beam splitters

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Quantifying Hidden Nonlinear Noise in Integrated Photonics

arXiv

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arXiv 2022年

We present experimental and simulated results to quantify the impact of nonlinear noise in integrated photonic devices relying on spontaneous four-wave mixing. Our results highlight the need for design rule adaptations to mitigate the otherwise intrinsic reduction in quantum state purity. The best strategy in devices with multiple parallel photon sources is to strictly limit photon generation outside of the sources. Otherwise, our results suggest that purity can decrease below 40%. © 2022, CC BY-NC-ND.

关键词： Four wave mixing

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