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First-step experiment in developing optical-spring quantum locking for DECIGO: sensitivity optimization for simulated quantum noise by completing the square

arXiv

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arXiv 2022年

作者： Ishikawa, Tomohiro Kawasaki, Yuki Tsuji, Kenji Yamada, Rika Watanabe, Izumi Wu, Bin Iwaguchi, Shoki Shimizu, Ryuma Umemura, Kurumi Nagano, Koji Enomoto, Yutaro Komori, Kentaro Michimura, Yuta Furusawa, Akira Kawamura, Seiji Department of Physics Nagoya University Aichi Nagoya464-8602 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Kanagawa Sagamihara252-5210 Japan Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Department of Physics University of Tokyo Bunkyo Tokyo113-0033 Japan LIGO Laboratory California Institute of Technology PasadenaCA91125 United States Graduate School of Science University of Tokyo Bunkyo Tokyo113-0033 Japan Center for Quantum Computing RIKEN 2-1 Hirosawa Saitama Wako351-0198 Japan The Kobayashi-Maskawa Institute for the Origin of Particles and the Universe Nagoya University Aichi Nagoya464-8602 Japan

DECi-hertz Interferometer Gravitational Wave Observatory (DECIGO) is a future mission for a space-borne laser interferometer. DECIGO has 1,000-km-long arm cavities mainly to detect the primordial gravitational waves (PGW) at lower frequencies around 0.1 Hz. Observations in the electromagnetic spectrum have lowered the bounds on the upper limit of PGW energy density (Ωgw ∼ 10−15 → 10−16). As a result, DECIGO’s target sensitivity, which is mainly limited by quantum noise, needs further improvement. To maximize the feasibility of detection while constrained by DECIGO’s large diffraction loss, a quantum locking technique with an optical spring was theoretically proposed to improve the signal-to-noise ratio of the PGW. In this paper, we experimentally verify one key element of the optical-spring quantum locking: sensitivity optimization by completing the square of multiple detector outputs. This experiment is operated on a simplified tabletop optical setup with classical noise simulating quantum noise. We succeed in getting the best of the sensitivities with two different laser powers by the square completion method. © 2022, CC BY.

关键词： Gravity waves

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Open hardware solutions in quantum technology

APL Quantum

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APL Quantum 2024年第1期1卷

作者： Nathan Shammah Anurag Saha Roy Carmen G. Almudever Sébastien Bourdeauducq Anastasiia Butko Gustavo Cancelo Susan M. Clark Johannes Heinsoo Loïc Henriet Gang Huang Christophe Jurczak Janne Kotilahti Alessandro Landra Ryan LaRose Andrea Mari Kasra Nowrouzi Caspar Ockeloen-Korppi Guen Prawiroatmodjo Irfan Siddiqi William J. Zeng Unitary Fund San Francisco California 94104 USA Qruise GmbH 66113 Saarbruecken Germany Technical University of Valencia Valencia Spain M-Labs Limited North Point Hong Kong Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Fermi National Accelerator Laboratory Batavia Illinois 60510 USA Sandia National Laboratories Albuquerque New Mexico 87123 USA IQM Quantum Computers Espoo 02150 Finland PASQAL 7 rue Leonard de Vinci 91300 Massy France Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Quantonation 75010 Paris France Center for Quantum Computing Science and Engineering Michigan State University East Lansing Michigan 48824 USA Microsoft Quantum Redmond Washington 98052 USA

Quantum technologies, such as communication, computing, and sensing, offer vast opportunities for advanced research and development. While an open-source ethos currently exists within some quantum technologies, especially in quantum computer programming, we argue that there are additional advantages in developing open quantum hardware (OQH). Open quantum hardware encompasses open-source software for the control of quantum devices in labs, blueprints, and open-source toolkits for chip design and other hardware components, as well as openly accessible testbeds and facilities that allow cloud-access to a wider scientific community. We provide an overview of current projects in the OQH ecosystem, identify gaps, and make recommendations on how to close them at present. More open quantum hardware would accelerate technology transfer to and growth of the quantum industry and increase accessibility in science.

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CoRE MOF DB: A Curated Experimental Metal-Organic Framework Database with Machine-Learned Properties for Integrated Material-Process Screening

SSRN

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SSRN 2024年

作者： Zhao, Guobin Brabson, Logan M. Chheda, Saumil Huang, Ju Kim, Haewon Liu, Kunhuan Mochida, Kenji Pham, Thang D. Prerna Terrones, Gianmarco G. Yoon, Sunghyun Zoubritzky, Lionel Coudert, François-Xavier Haranczyk, Maciej Kulik, Heather J. Moosavi, Seyed Mohamad Sholl, David S. Siepmann, J. Ilja Snurr, Randall Q. Chung, Yongchul G. School of Chemical and Biomolecular Engineering Pusan National University Busan46241 Korea Republic of School of Chemical & Biomolecular Engineering Georgia Institute of Technology AtlantaGA30332 United States Department of Chemistry Chemical Theory Center University of Minnesota 207 Pleasant Street SE MinneapolisMN55455 United States Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Avenue SE MinneapolisMN55455 United States Department of Chemistry Kavli Energy Nanoscience Institute Bakar Institute of Digital Materials for the Planet College of Computing Data Science and Society University of California BerkeleyCA94720 United States Chemical Engineering & Applied Chemistry University of Toronto TorontoONM5S 3E5 Canada Department of Chemical & Biological Engineering Northwestern University EvanstonIL60208 United States Department of Chemical Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Chimie ParisTech PSL University CNRS Institut de Recherche de Chimie Paris Paris75005 France Air Liquide Campus Innovation Paris Les Loges-en-Josas 78350 France IMDEA Materials Institute Getafe Madrid28906 Spain Department of Chemistry Massachusetts Institute of Technology CambridgeMA02139 United States Oak Ridge National Laboratory Oak RidgeTN37830 United States

We present an updated version of the CoRE MOF database, which includes a curated set of computation-ready MOF crystal structures designed for high-throughput computational materials discovery. Data collection and curation procedures were improved from the previous version to enable more frequent updates in the future. Machine learning-predicted properties, such as stability metrics and heat capacities, are included in the dataset to streamline screening activities. An updated version of MOFid was developed to provide detailed information on metal nodes, organic linkers, and topologies of a MOF structure. DDEC06 partial atomic charges of MOFs were assigned based on a machine learning model. Gibbs-Ensemble Monte Carlo simulations were used to classify the hydrophobicity of MOFs. The finalized dataset was subsequently used to perform integrated material-process screening for various carbon capture conditions using high-fidelity temperature-swing adsorption (TSA) simulations. Our workflow identified multiple MOF candidates that are predicted to outperform CALF-20 for these applications. © 2024, The Authors. All rights reserved.

关键词： Carbon capture and utilization

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Acceleration-induced effects in stimulated light-matter interactions

arXiv

引用

arXiv 2021年

作者： Šoda, Barbara Sudhir, Vivishek Kempf, Achim Department of Physics University of Waterloo WaterlooONN2L 3G1 Canada Perimeter Institute for Theoretical Physics WaterlooONN2L 2Y5 Canada Department of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA02139 United States LIGO Laboratory Massachusetts Institute of Technology CambridgeMA02139 United States Department of Applied Mathematics University of Waterloo WaterlooONN2L 3G1 Canada Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada

The interaction between light and an atom proceeds via three paradigmatic mechanisms: spontaneous emission, stimulated emission, and absorption. All three are resonant processes in the sense that they require that the radiation field be resonant with the atomic transition. The non-resonant counterparts of these effects, while necessary to maintain locality of the interaction in principle, are usually negligible because their effects tend to average out over multiple cycles of the radiation field. This state of affairs does not hold if the atom is accelerated. We show that, when accelerated, the non-resonant effects can be made to dominate over the conventional resonant effects. In fact we show that the non-resonant effects can be vastly enhanced by stimulation, and that suitably chosen acceleration can entirely suppress the resonant effects. In the class of effects that we study, the Unruh effect is the special case of vanishing stimulation. © 2021, CC BY-NC-ND.

关键词： Atoms

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Unruh effect of detectors with quantized center-of-mass

arXiv

引用

arXiv 2021年

作者： Sudhir, Vivishek Stritzelberger, Nadine Kempf, Achim Department of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA02139 United States LIGO Laboratory Massachusetts Institute of Technology CambridgeMA02139 United States Department of Applied Mathematics University of Waterloo WaterlooONN2L 3G1 Canada Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Perimeter Institute for Theoretical Physics WaterlooONN2L 2Y5 Canada Department of Physics University of Waterloo WaterlooONN2L 3G1 Canada

The Unruh effect is the prediction that particle detectors accelerated through the vacuum get excited by the apparent presence of radiation quanta - a fundamental quantum phenomenon in the presence of acceleration. Prior treatments of the Unruh effect, that presume a classically prescribed trajectory, do not account for the quantum dynamics of the detector's center-of-mass. Here, we study more realistic detectors whose center of mass is a quantized degree of freedom being accelerated by an external classical field. We investigate the detector's recoil due to the emission of Unruh quanta. Vice versa, we also study the recoil's impact on the emission of Unruh quanta and the excitation of the detector. We find that the recoil due to the emission of Unruh quanta may be a relevant experimental signature of the Unruh effect. © 2021, CC BY-NC-SA.

关键词： Degrees of freedom (mechanics)

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High-Speed Graphene-based Sub-Terahertz Receivers enabling Wireless Communications for 6G and Beyond

arXiv

引用

arXiv 2024年

作者： Soundarapandian, Karuppasamy Pandian Castilla, Sebastián Koepfli, Stefan M. Marconi, Simone Kulmer, Laurenz Vangelidis, Ioannis de la Bastida, Ronny Rongione, Enzo Tongay, Sefaattin Watanabe, Kenji Taniguchi, Takashi Lidorikis, Elefterios Tielrooij, Klaas-Jan Leuthold, Juerg Koppens, Frank H.L. ICFO - Institut de Ciències Fotòniques The Barcelona Institute of Science and Technology Castelldefels Barcelona08860 Spain Zurich8092 Switzerland Department of Materials Science and Engineering University of Ioannina Ioannina45110 Greece BIST and CSIC Campus UAB Bellaterra Barcelona08193 Spain Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Materials Science and Engineering University of California BerkeleyCA94720-1760 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Institute of Materials Science and Computing Ioannina45110 Greece Department of Applied Physics TU Eindhoven Den Dolech 2 Eindhoven5612 AZ Netherlands ICREA - Institució Catalana de Recerca i Estudis Avançats Barcelona08010 Spain

In recent years, the telecommunications field has experienced an unparalleled proliferation of wireless data traffic. Innovative solutions are imperative to circumvent the inherent limitations of the current technology, in particular in terms of capacity. Carrier frequencies in the sub-terahertz (sub-THz) range (~0.2-0.3 THz) can deliver increased capacity and low attenuation for short-range wireless applications. Here, we demonstrate a direct, passive and compact sub-THz receiver based on graphene, which outperforms state-of-the-art sub-THz receivers. These graphene-based receivers offer a cost-effective, CMOS-compatible, small-footprint solution that can fulfill the size, weight, and power consumption (SWaP) requirements of 6G technologies. We exploit a sub-THz cavity, comprising an antenna and a back mirror, placed in the vicinity of the graphene channel to overcome the low inherent absorption in graphene and the mismatch between the areas of the photoactive region and the incident radiation, which becomes extreme in the sub-THz range. The graphene receivers achieve a multigigabit per second data rate with a maximum distance of ~3 m from the transmitter, a setup-limited 3 dB bandwidth of 40 GHz, and a high responsivity of 0.16 A/W, enabling applications such as chip-to-chip communication and close proximity device-to-device communication. Copyright © 2024, The Authors. All rights reserved.

关键词： CMOS integrated circuits

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Quasiparticle Trapping at Vortices Producing Josephson Supercurrent Enhancement

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Physical Review Letters 2022年第20期128卷 207001-207001页

作者： Yosuke Sato Kento Ueda Yuusuke Takeshige Hiroshi Kamata Kan Li Lars Samuelson H. Q. Xu Sadashige Matsuo Seigo Tarucha Department of Applied Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Center for Emergent Matter Science RIKEN 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan Laboratoire de Physique de l’École Normale Supérieure ENS PSL Research University CNRS Sorbonne Université Université Paris Diderot Sorbonne Paris Cité 24 rue Lhomond 75231 Paris Cedex 05 France Beijing Key Laboratory of Quantum Devices Key Laboratory for the Physics and Chemistry of Nanodevices and School of Electronics Peking University Beijing 100871 China Division of Solid State Physics and NanoLund Lund University Box 118 SE-221 00 Lund Sweden Department of Electrical and Electronic Engineering Southern University of Science and Technology 1088 Xueyuan Blvd Nanshan Shenzhen Guangdong 518055 China Beijing Academy of Quantum Information Sciences Beijing 100193 China JST PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan RIKEN Center for Quantum Computing RIKEN 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan

The Josephson junction of a strong spin-orbit material under a magnetic field is a promising Majorana fermion candidate. Supercurrent enhancement by a magnetic field has been observed in the InAs nanowire Josephson junctions and assigned to a topological transition. In this work we observe a similar phenomenon but discuss the nontopological origin by considering the trapping of quasiparticles by vortices that penetrate the superconductor under a finite magnetic field. This assignment is supported by the observed hysteresis of the switching current when sweeping up and down the magnetic field. Our experiment shows the importance of quasiparticles in superconducting devices with a magnetic field, which can provide important insights for the design of qubits using superconductors.

关键词： Majorana fermions Spin-orbit coupling Josephson junctions Nanowires Superconductors

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DESIGN AND IMPLEMENTATION OF THE ILLINOIS EXPRESS QUANTUM METROPOLITAN AREA NETWORK

arXiv

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arXiv 2022年

作者： Chung, Joaquin Eastman, Ely M. Kanter, Gregory S. Kapoor, Keshav Lauk, Nikolai Peña, Cristián Plunkett, Robert Sinclair, Neil Thomas, Jordan M. Valivarthi, Raju Xie, Si Kettimuthu, Rajkumar Kumar, Prem Spentzouris, Panagiotis Spiropulu, Maria Data Science and Learning Division Argonne National Laboratory 9700 S Cass Ave. LemontIL60439 United States The University of Chicago Consortium for Advanced Science and Engineering 924 E 57th St ChicagoIL60637 United States NuCrypt Llc 1840 Oak Ave EvanstonIL60201 United States Center for Photonic Communication and Computing Department of Electrical and Computer Engineering McCormick School of Engineering and Applied Science Northwestern University 2145 Sheridan Road EvanstonIL60208-3118 United States Division of Physics Mathematics and Astronomy California Institute of Technology 1200 E. California Blvd. PasadenaCA91125 United States California Institute of Technology 1200 E. California Blvd. PasadenaCA91125 United States Fermi National Accelerator Laboratory Kirk Rd and Pine St BataviaIL60510 United States John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. CambridgeMA02138 United States 2205 Tech Drive Suite 1-160 EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University 2145 Sheridan Road EvanstonIL60208-3112 United States

The Illinois Express Quantum Network (IEQNET) is a program to realize metropolitan scale quantum networking over deployed optical fiber using currently available technology. IEQNET consists of multiple sites that are geographically dispersed in the Chicago metropolitan area. Each site has one or more quantum nodes (Q-Nodes) representing the communication parties in a quantum network. Q-Nodes generate or measure quantum signals such as entangled photons and communicate the measurement results via standard, classical signals and conventional networking processes. The entangled photons in IEQNET nodes are generated at multiple wavelengths, and are selectively distributed to the desired users via transparent optical switches. Here we describe the network architecture of IEQNET, including the Internet-inspired layered hierarchy that leverages softwaredefined networking (SDN) technology to perform traditional wavelength routing and assignment between the Q-Nodes. Specifically, SDN decouples the control and data planes, with the control plane being entirely implemented in the classical domain. We also discuss the IEQNET processes that address issues associated with synchronization, calibration, network monitoring, and scheduling. An important goal of IEQNET is to demonstrate the extent to which the control plane classical signals can co-propagate with the data plane quantum signals in the same fiber lines (quantum-classical signal "coexistence"). This goal is furthered by the use of tunable narrow-band optical filtering at the receivers and, at least in some cases, a wide wavelength separation between the quantum and classical channels. We envision IEQNET to aid in developing robust and practical quantum networks by demonstrating metro-scale quantum communication tasks such as entanglement distribution and quantum-state teleportation. Copyright © 2022, The Authors. All rights reserved.

关键词： Network architecture

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Numerical study of heat transfer in Rayleigh-Bénard convection under rarefied gas conditions

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Physical Review E 2020年第1期102卷 013102-013102页

作者： B. Goshayeshi G. Di Staso F. Toschi H. J. H. Clercx Fluid Dynamics Laboratory and J.M. Burgers Center for Fluid Dynamics Department of Applied Physics Eindhoven University of Technology P. O. Box 513 5600 MB Eindhoven The Netherlands Centre of Analysis Scientific Computing and Applications W&I Department of Mathematics and Computer Science Eindhoven University of Technology P. O. Box 513 5600 MB Eindhoven The Netherlands Istituto per le Applicazioni del Calcolo Consiglio Nazionale delle Ricerche 00185 Rome Italy

The focus of this research is to delineate the thermal behavior of a rarefied monatomic gas confined between horizontal hot and cold walls, physically known as rarefied Rayleigh-Bénard (RB) convection. Convection in a rarefied gas appears only for high temperature differences between the horizontal boundaries, where nonlinear distributions of temperature and density make it different from the classical RB problem. Numerical simulations adopting the direct simulation Monte Carlo approach are performed to study the rarefied RB problem for a cold to hot wall temperature ratio equal to r=0.1 and different rarefaction conditions. Rarefaction is quantified by the Knudsen number, Kn. To investigate the long-time thermal behavior of the system two ways are followed to measure the heat transfer: (i) measurements of macroscopic hydrodynamic variables in the bulk of the flow and (ii) measurements at the microscopic scale based on the molecular evaluation of the energy exchange between the isothermal wall and the fluid. The measurements based on the bulk and molecular scales agreed well. Hence, both approaches are considered in evaluations of the heat transfer in terms of the Nusselt number, Nu. To characterize the flow properly, a modified Rayleigh number (Ram) is defined to take into account the nonlinear temperature and density distributions at the pure conduction state. Then the limits of instability, indicating the transition of the conduction state into a convection state, at the low and large Froude asymptotes are determined based on Ram. At the large Froude asymptote, simulations following the onset of convection showed a relatively small range for the critical Rayleigh (Ram=1770±15) that flow instability occurs at each investigated rarefaction degree. Moreover, we measured the maximum Nusselt values Numax at each investigated Kn. It was observed that for Kn≥0.02, Numax decreases linearly until the transition to conduction at Kn≈0.03, known as the rarefaction limit for

关键词： Flow instability Rarefied flows Rayleigh-Bénard convection

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Autonomous Deployment of a Solar Panel Using Elastic Origami and Distributed Shape-Memory-Polymer Actuators

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Physical Review applied 2019年第6期11卷 064069-064069页

作者： Tian Chen Osama R. Bilal Robert Lang Chiara Daraio Kristina Shea Engineering Design and Computing Laboratory Department of Mechanical and Process Engineering ETH Zurich Zurich 8092 Switzerland Division of Engineering and Applied Science California Institute of Technology Pasadena California 91125 USA Lang Origami Altadena California 91001 USA

We introduce a metamaterial-based self-deployable system with a rotational periodicity. As a demonstration, we propose an autonomous solar panel array that is programmed to self-deploy in response to changes in the surrounding temperature. We achieve shape reconfiguration and structural stability by exploiting the physical properties in the constituting material and the architecture of the wedge-shaped unit cell. The unit cell consists of one arm of the elastic “flasher” origami and a pair of scissor mechanisms. First, kinematic analysis shows the difference between the theoretical behavior and behavior considering the physical dimensions. This is used to optimize the expansion ratio. Second, the deployment mechanics are enabled through the shape-memory effect inherent in the underlying polymer. A viscoelastic constitutive model is constructed to accurately predict the self-expanding behavior. Lastly, the collapsing and deployment dynamics are discussed. Bifurcation is observed during folding, leading to two different end states, a disk or a cone. By investigating the energy landscape of the system, an apparatus is introduced to enable the disk-shaped folding. A two-stage expansion is observed during deployment. The system first rotates and then expands radially. The resulting system is three-dimensionally (3D) printed, achieves an expansion ratio of 1000% in under 40 s, and shows excellent agreement with simulation prediction both in the collapsed and expanded configurations.

关键词： Origami & Kirigami Smart materials Thermomechanical effects Elastomers Polymer glasses Shape-memory materials Solar cells Finite-element method

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