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arXiv 2023年

作者： Hance, Jonte R. Ji, Ming Hofmann, Holger F. 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, to see if this can tell us anything about how best to interpret this paradox. We show that this scenario can be analysed using the relation between three different measurements, which seem to result in a logical contradiction. We discuss how this contextual behaviour links to weak values, and coherences between prohibited states. Rather than showing a property of the particle is disembodied, the quantum Cheshire cat instead demonstrates the effects of these coherences, which are typically found in pre- and postselected systems. © 2023, CC BY.

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quantum computing for corrosion-resistant materials and anti-corrosive coatings design

arXiv

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arXiv 2024年

作者： Nguyen, Nam Watts, Thomas W. Link, Benjamin Williams, Kristen S. Sanders, Yuval R. Elman, Samuel J. Kieferova, Maria Bremner, Michael J. Morrell, Kaitlyn J. Elenewski, Justin Isaacs, Eric B. Johnson, Samuel D. Mathieson, Luke Obenland, Kevin M. Otten, Matthew Sundareswara, Rashmi Holmes, Adam Boeing Research & Technology United States HRL Laboratories LLC MalibuCA United States Centre for Quantum Software and Information School of Computer Science Faculty of Engineering & Information Technology University of Technology SydneyNSW2007 Australia Centre for Quantum Computation and Communication Technology University of Technology SydneyNSW2007 Australia MIT Lincoln Laboratory LexingtonMA United States Department of Physics University of Wisconsin - Madison MadisonWI United States

Recent estimates indicate that the U.S. Department of Defense spends over $20 billion USD annually on corrosion-related maintenance. This expenditure is accompanied by a substantial loss in asset readiness, ranging from 10% to 30%. Moreover, the global costs associated with corrosion damage have been estimated at an astonishing $2.5 trillion USD per year, or approximately 3.4% of global GDP in 2016. This project aims to describe how quantum computers might be leveraged to fundamentally change the way material-environment interactions are modeled for material discovery, selection, and design. This project also seeks to understand the plausibility and utility of replacing portions of classical computing workflows with algorithms optimized for quantum computing hardware. The utility of quantum computers is explored through the lens of two industrially relevant problems: (1) characterizing magnesium alloy corrosion properties in aqueous environments and (2) identifying stable niobium-rich alloys with corrosion resistance at temperatures above 1500K. This paper presents an end-to-end analysis of the complexity of both classical and quantum algorithms used in application workflows. Resource estimates are produced using a custom software package, pyLIQTR, based on the qubitized quantum Phase Estimation (QPE) algorithm. Estimates for the two aforementioned applications show that industrially-relevant computational models that have the potential to deliver commercial utility require quantum computers with thousands to hundreds of thousands of logical qubits and the ability to execute 1013 to 1019 T-gates. These estimates represent an upper bound and motivate continued research into improved quantum algorithms and resource reduction techniques. © 2024, CC BY.

关键词： Corrosion resistance

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Suppressing Counter-Rotating Errors for Fast Single-Qubit Gates with Fluxonium

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PRX quantum 2024年第4期5卷 040342-040342页

作者： David A. Rower Leon Ding Helin Zhang Max Hays Junyoung An Patrick M. Harrington Ilan T. Rosen Jeffrey M. Gertler Thomas M. Hazard Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Present address: Atlantic Quantum Cambridge MA 02139 USA. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Present address: HRL Laboratories Malibu CA 90265 USA. Lincoln Laboratory Massachusetts Institute of Technology Lexington Massachusetts 02421 USA

Qubit decoherence unavoidably degrades the fidelity of quantum logic gates. Accordingly, realizing gates that are as fast as possible is a guiding principle for qubit control, necessitating protocols for mitigating error channels that become significant as gate time is decreased. One such error channel arises from the counter-rotating component of strong, linearly polarized drives. This error channel is particularly important when gate times approach the qubit Larmor period and represents the dominant source of infidelity for sufficiently fast single-qubit gates with low-frequency qubits such as fluxonium. In this work, we develop and demonstrate two complementary protocols for mitigating this error channel. The first protocol realizes circularly polarized driving in circuit QED through simultaneous charge and flux control. The second protocol—commensurate pulses—leverages the coherent and periodic nature of counter-rotating fields to regularize their contributions to gates, enabling single-qubit gate fidelities reliably exceeding 99.997%. This protocol is platform independent and requires no additional calibration overhead. This work establishes straightforward strategies for mitigating counter-rotating effects from strong drives in circuit QED and other platforms, which we expect to be helpful in the effort to realize high-fidelity control for fault-tolerant quantum computing.

关键词： Qubits

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Error Correcting States in Ultracold Atoms

arXiv

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arXiv 2023年

作者： Kendell, Harry C.P. Ferranti, Giacomo Weidner, Carrie A. Quantum Engineering Centre for Doctoral Training University of Bristol BristolBS8 1FD United Kingdom Quantum Engineering Technology Laboratories H. H. Wills Physics Laboratory Department of Electrical Electronic and Mechanical Engineering University of Bristol BristolBS8 1FD United Kingdom

We demonstrate a method for encoding Gottesman-Kitaev-Preskill (GKP) error-correcting qubits with single ultracold atoms trapped in individual sites of a deep optical lattice. Using quantum optimal control protocols, we demonstrate the generation of GKP qubit states with 10 dB squeezing, which is the current minimum allowable squeezing level for use in surface code error correction. States are encoded in the vibrational levels of the individual lattice sites and generated via phase modulation of the lattice potential. Finally, we provide a feasible experimental protocol for the realization of these states. Our protocol opens up possibilities for generating large arrays of atomic GKP states for continuous-variable quantum information. © 2023, CC BY.

关键词： Optical lattices

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Plasma functionalized MoSe2 for efficient nonenzymatic sensing of hydrogen peroxide in ultra-wide pH range

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SmartMat 2022年第3期3卷 491-502页

作者： Yang Luo Donghai Wu Zehui Li Xiao‐Yan Li Yinghong Wu Shien‐Ping Feng Carlo Menon Houyang Chen Paul K.Chu Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongHong KongChina Empa Swiss Federal Laboratories for Materials Science and TechnologyETH DomainDübendorfSwitzerland Centre for Water Technology and Policy Department of Civil EngineeringThe University of Hong KongHong KongChina Henan Key Laboratory of Nanocomposites and Applications Institute of Nanostructured Functional MaterialsHuanghe S&T UniversityZhengzhouChina State Key Laboratory for Mesoscopic Physics Collaborative Innovation Center of Quantum MatterSchool of PhysicsPeking UniversityBeijingChina Biomedical and Mobile Health Technology Lab Department of Health Sciences and TechnologyETH ZürichZürichSwitzerland Department of Mechanical Engineering The University of Hong KongHong KongChina Department of Chemical and Biological Engineering State University of New York at BuffaloNew YorkUSA

Enzymatic sensors have inherent problems such as the low stability and limited pH range in industrial and biomedical applications and therefore,more efficient nonenzymatic sensors are highly ***,plasmafunctionalized defective MoSe_(2)is prepared and studied as a highly efficient catalyst for electrochemical sensing of H_(2)O_(2).Experiments and theoretical computations show that the plasma-induced Se multi-vacancies and nitrogen dopants generate new active sites,expose more edge active surfaces,narrow the bandgap,and strengthen binding with the·OH intermediate,which imparts new fundamental knowledge about the roles of defects in *** defective MoSe_(2)-catalyzed sensor delivers competitive performance in hydrogen peroxide detection such as a low detection limit of 12.6 nmol/L,wide operational pH range of 1−13,good long-term stability,and high *** portable sensor produced by screen printing confirms the excellent commercial potential and in addition,the results not only reveal a novel concept to design and fabricate high-performance sensors for H_(2)_(O2)but also provide insights into the effectiveness of surface modification of diverse catalytic materials.

关键词： MoSe_(2) plasma functionalization electrochemical sensors hydrogen peroxides portable devices

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Interaction-Free Polarimetry

arXiv

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arXiv 2022年

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

The combination of interaction-free measurement and the quantum Zeno effect has been shown to both increase the signal-to-noise ratio of imaging, and decrease the light intensity flux through the imaged object. So far though, this has only been considered for discrimination between translucent and opaque areas of an object. In this paper, we extend this to the polarimetry of a given sample. This will allow the identification and characterisation of these samples with far less absorbed energy than current approaches—a key concern for delicate samples being probed with high-frequency radiation. Copyright © 2022, The Authors. All rights reserved.

关键词： Polarimeters

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Application of Weighted Chebyshev Approximation in Pulse Design for quantum Gates

Application of Weighted Chebyshev Approximation in Pulse Des...

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IEEE Workshop on Signal Processing Systems (SIPS)

作者： Qi Ding Alan V. Oppenheim Petros T. Boufounos Simon Gustavsson Jeffrey A. Grover Thomas A. Baran William D. Oliver Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Mitsubishi Electric Research Laboratories Cambridge MA USA Department of Physics Massachusetts Institute of Technology Cambridge MA USA Atlantic Quantum Cambridge MA USA

ISBN: (数字)9798350373752

ISBN: (纸本)9798350373769

Chebyshev approximation problems are fundamen-tal in approximation theory and are integral to various engi-neering applications. In this study, we suggest that weighted Chebyshev approximation (WCA) can be effectively applied to designing quantum gates. Specifically, we examine a class of two-qubit gates in superconducting qubits known as controlled-phase (CPHASE) gates, which leverage interactions between higher levels controlled by baseband flux pulses. We frame the design of CPHASE gates as a pulse design problem and propose Chebyshev pulses, generated through WCA, as an alternative solution. We utilize an illustrative example to demonstrate our process of designing a Chebyshev pulse with WCA, then contrast it with a benchmark Slepian pulse for comparison. We find that Chebyshev pulses can facilitate faster CPHASE gates while ensuring leakage errors remain below the desired threshold.

关键词： Baseband Simulation Design methodology Conferences Qubit Logic gates Chebyshev approximation Benchmark testing Signal processing Iterative methods

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

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

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

作者： Shiori Konisho Junji Sakamoto Hiromitsu Imai Tomoya Akatsuka Hidetoshi Katori Katsuya Oguri Toshikazu Hashimoto Tetsuomi Sogawa NTT Device Technology Laboratories NTT Corporation Atsugi Kanagawa Japan NTT Basic Research Laboratories NTT Corporation Atsugi Kanagawa Japan Quantum Metrology Laboratory RIKEN Wako Saitama Japan Department of Applied Physics Graduate School of Engineering The University of Tokyo Tokyo Japan NTT Science and Core Technology Laboratory Group NTT Corporation Atsugi Kanagawa 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: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Atom optics Atom lasers Optical device fabrication Lattices Lasers and electrooptics Charge carrier processes Atoms

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引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Basani, Jasvith Raj Vadlamani, Sri Krishna Bandyopadhyay, Saumil Englund, Dirk R. Hamerly, Ryan Department of Electrical and Computer Engineering Institute for Research in Electronics and Applied Physics Joint Quantum Institute University of Maryland College ParkMD20742 United States Research Laboratory of Electronics Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States NTT Research Inc. PHI Laboratories 940 Stewart Drive SunnyvaleCA94085 United States

We propose a novel architecture for multiport interferometers based on the Sine-Cosine fractal decomposition of unitary matrices. Our design is modular, resilient to hardware imperfections and enables systematically t... 详细信息

ISBN: (纸本)9781957171258

关键词： Fractals

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Weak values and the past of a quantum particle

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Physical Review Research 2023年第2期5卷 023048-023048页

作者： Jonte R. Hance John Rarity James Ladyman Quantum Engineering Technology Laboratories Department of Electrical and Electronic Engineering University of Bristol Woodland Road Bristol BS8 1US United Kingdom Department of Philosophy University of Bristol Cotham House Bristol BS6 6JL United Kingdom

We investigate four key issues with using a nonzero weak value of the spatial projection operator to infer the past path of an individual quantum particle. First, we note that weak measurements disturb a system, so any approach relying on such a perturbation to determine the location of a quantum particle describes the state of a disturbed system, not that of a hypothetical undisturbed system. Second, even assuming no disturbance, there is no reason to associate the nonzero weak value of an operator containing the spatial projection operator with the classical idea of “particle presence.” Third, weak values are only measurable over ensembles, and so to infer properties of individual particles from values of them is problematic. Finally, weak value approaches to the path of a particle do not provide information beyond standard quantum mechanics (and the classical modes supporting the experiment). We know of no experiment with testable consequences that demonstrates a connection between particle presence and weak values.

关键词： Nonlocality Particle phenomena Photonics quantum optics Weak values & weak measurements

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