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Detecting quantum-coherent nanomechanical oscillations using the current-noise spectrum of a double quantum dot

Physical Review B 2008年第21期78卷 214302-214302页

作者： Neill Lambert Franco Nori Advanced Science Institute The Institute of Physical and Chemical Research (RIKEN) Saitama 351-0198 Japan Department of Physics Center for Theoretical Physics Applied Physics Program Center for the Study of Complex Systems The University of Michigan Ann Arbor Michigan 48109-1040 USA

We consider a nanomechanical resonator coupled to a double quantum dot. We demonstrate how the finite-frequency current-noise spectrum through the double quantum dot can be used to distinguish classical and quantum behavior in the nearby nanoelectromechanical resonator. We also show how the full-frequency current-noise spectrum gives important information on the combined double quantum dot-resonator energy spectrum. Finally, we point out regimes where the quantum state of the resonator becomes squeezed and also examine the cross-correlated electron-phonon current noise.

关键词： electron-phonon interactions micromechanical resonators nanotechnology quantum dots

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On Evaluation of Robust Autonomy for Uninhabited Vehicles and systems

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IFAC Proceedings Volumes 2010年第16期43卷 348-353页

作者： Tristan Perez Alejandro Donaire Brendan P. Willams School of Engineering Discipline of Mechanics and Mechatronics The University of Newcastle Callaghan NSW 2308 AUSTRALIA Centre for Complex Dynamic Systems and Control (CDSC) The University of Newcastle Callaghan NSW 2308 AUSTRALIA Advanced UAS Applications Program Boeing Research & Technology Australia GPO Box 767 Brisbane QLD 4001 AUSTRALIA

This paper discusses a method to quantify robust autonomy of Uninhabited Vehicles and systems (UVS) in aerospace, marine, or land applications. Based on mission-vehicle specific performance criteria, we define an system utility function that can be evaluated using simulation scenarios for an envelope of environmental conditions. The results of these evaluations are used to compute a figure of merit or measure for operational effectiveness (MOE). The procedure is then augmented to consider faults and the performance of mechanisms to handle these faulty operational modes. This leads to a measure of robust autonomy (MRA). The objective of the proposed figures of merit is to assist in decision making about vehicle performance and reliability at both vehicle development stage (using simulation models) and at certification stage (using hardware-in-the-loop testing). Performance indices based on dynamic and geometric tasks associated with vehicle manoeuvring problems are proposed, and an example of a two-dimensional fly scenario is provided to illustrate the use of the proposed figures of merit.

关键词： uninhabited vehicles performance evaluation manoeuvring problem

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Low-symmetry vacancy-related spin qubit in hexagonal boron nitride

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npj Computational Materials 2024年第1期10卷 1318-1326页

作者： Rohit Babar Gergely Barcza Anton Pershin Hyoju Park Oscar Bulancea Lindvall GergőThiering Örs Legeza Jamie H.Warner Igor A.Abrikosov Adam Gali Viktor Ivády HUN-REN Wigner Research Centre for Physics PO Box 49H-1525 BudapestHungary MTA-ELTE Lendület“Momentum”NewQubit Research Group Pázmány PéterSétány 1/A1117 BudapestHungary Department of Atomic Physics Insitute of PhysicsBudapest University of Technology and EconomicsMűegyetem rakpart 3.H-1111 BudapestHungary Walker Department of Mechanical Engineering and Materials Graduate Program Texas Materials InstituteThe University of Texas at AustinAustinTX78712USA Department of Physics Chemistry and BiologyLinköping UniversitySE-58183 LinköpingSweden Institute for Advanced Study Technical University of MunichLichtenbergstrasse 2a85748 GarchingGermany MTA-WFK Lendület“Momentum”Semiconductor Nanostructures Research Group PO Box 49H-1525 BudapestHungary Department of Physics of Complex Systems Eötvös Loránd UniversityEgyetem tér 1-3H-1053 BudapestHungary

Point defect qubits in semiconductors have demonstrated their outstanding capabilities for high spatial resolution sensing generating broad multidisciplinary *** boron nitride(hBN)hosting point defect qubits have recently opened up new horizons for quantum sensing by implementing sensing *** sensitivity of point defect sensors in hBN is currently limited by the linewidth of the magnetic resonance signal,which is broadened due to strong hyperfine couplings.

关键词： boron defect hexagonal

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IVS O5: New developments and research trends for intelligent vehicles

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IEEE Intelligent systems 2005年第4期20卷 10-14页

作者： Wang, Fei-Yue Li, Li Song, Jingyan Niehsen, Wolfgang Zheng, Nan-Ning University of Arizona Chinese Academy of Science United States University of Arizona United States Tsinghua University China Chinese Academy of Sciences China Robert Bosch Corporate Research United States Xi'an Jiaotong University China Department of Automation Tsinghua University Beijing China University of Arizona's Systems Industrial Engineering Department United States University's Program in Advanced Research of Complex Systems United States Key Laboratory of Complex Systems and Intelligence Science Chinese Academy of Sciences China Robert Bosch Corporate Research United States Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University China

Recent advances and research trends for intelligent vehicles were studied. Vehicle-state sensing focuses on measuring a vehicle's movement and monitoring its actuators. Individual-vehicle-control research focuses mainly on guaranteeing driving safety. The results suggest that intervehicle, vehicle-roadside, and vehicle-driver information sharing currently the most attractive trend in intelligent-vehicle research.

关键词： Intelligent vehicle highway systems

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Anti-PT flatbands

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Physical Review A 2022年第2期105卷 L021305-L021305页

作者： Arindam Mallick Nana Chang Alexei Andreanov Sergej Flach Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Daejeon 34126 Korea Beijing National Research Center for Information Science and Technology Tsinghua University Beijing 100084 China Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing 100875 People's Republic of China Basic Science Program Korea University of Science and Technology (UST) Daejeon 34113 Korea

We consider tight-binding single-particle lattice Hamiltonians which are invariant under an antiunitary antisymmetry: the anti-PT symmetry. The Hermitian Hamiltonians are defined on d-dimensional non-Bravais lattices. For an odd number of sublattices, the anti-PT symmetry protects a flatband at energy E=0. We derive the anti-PT constraints on the Hamiltonian and use them to generate examples of generalized kagome networks in two and three lattice dimensions. Furthermore, we show that the anti-PT symmetry persists in the presence of uniform DC fields and ensures the presence of flatbands in the corresponding irreducible Wannier-Stark band structure. We provide examples of the Wannier-Stark band structure of generalized kagome networks in the presence of DC fields, and their implementation using Floquet engineering.

关键词： Electrical conductivity Stark effect Symmetry protected topological states Electronically polarized systems Lattices Discrete symmetries in condensed matter Lattice models in condensed matter Symmetries in condensed matter

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Topological photonics and beyond:introduction

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Photonics research 2021年第1期9卷 I0001-I0002页

作者： ANDREA ALù LAURA PILOZZI HAITAN XU JINGYUN FAN Photonics Initiative Advanced Science Research CenterCity University of New YorkNew York 10031USA Physics Program Graduate CenterCity University of New YorkNew YorkNew York 10016USA Institute for Complex Systems National Research Council(ISC-CNR)Via dei Taurini 1900185 RomeItaly Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Topological photonics has been opening exciting opportunities in recent optics *** this feature issue,we present a collection of papers outlining state-of-the-art and application perspectives for this thriving field o... 详细信息

关键词： beyond optics photonics

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Developing and improving transportation systems: The structure and operation of IEEE intelligent transportation systems society

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IEEE Transactions on Intelligent Transportation systems 2005年第3期6卷 261-264页

作者： Wang, Fei-Yue Herget, Charles Zeng, Daniel IEEE ITSS Chinese Academy of Sciences Institute of Automation Beijing 100080 China University of Arizona Department of Systems and Industrial Engineering Tucson AZ 85721 United States IEEE ITSS Herget Associates Alameda CA 94501 United States IEEE ITSS University of Arizona Department of Management Information Systems Tucson AZ 85721 United States Program for Advanced Research in Complex Systems University of Arizona Tucson Key Laboratory of Complex Systems and Intelligence Science Chinese Academy of Sciences ITS Department of the IEEE Intelligent Systems IEEE ITS Society IEEE SMC Board of Governors Herget Associates Alameda CA IEEE Standards ITS US Department of Transportation Department of Management Information Systems University of Arizona INFORMS AAAI and ACM IEEE ITS Society Technical Activities of the Chinese Association for Science and Technology United States

This editorial introduces the structure and operation of the IEEE Intelligent Transportation systems Society (ITSS). A brief history of the ITSS is presented, along with its mission, organizational structure, and a re... 详细信息

关键词： Transportation

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Lower limit on the achievable temperature in resonator-based sideband cooling

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Physical Review B 2008年第3期78卷 035406-035406页

作者： M. Grajcar S. Ashhab J. R. Johansson Franco Nori Advanced Science Institute The Institute of Physical and Chemical Research (RIKEN) Wako-shi 351-0198 Japan Department of Experimental Physics Comenius University SK-84248 Bratislava Slovakia Center for Theoretical Physics Physics Department Applied Physics Program Center for the Study of Complex Systems The University of Michigan Ann Arbor Michigan 48109-1040 USA CREST Japan Science and Technology Agency (JST) Kawaguchi Saitama 332-0012 Japan

A resonator with eigenfrequency ωr can be effectively used as a cooler for another linear oscillator with a much smaller frequency ωm⪡ωr. A huge cooling effect, which could be used to cool a mechanical oscillator below the energy of quantum fluctuations, has been predicted by several authors. However, here we show that there is a lower limit T∗ on the achievable temperature, given by T∗=Tmωm/ωr, that was not considered in previous work and can be higher than the quantum limit in realistic experimental realizations. We also point out that the decay rate of the resonator, which previous studies stress should be small, must be larger than the decay rate of the cooled oscillator for effective cooling.

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Quantum electrodynamics and photon-assisted tunneling in long Josephson junctions

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Physical Review B 2008年第13期78卷 134518-134518页

作者： A. O. Sboychakov Sergey Savel’ev Franco Nori Advanced Science Institute The Institute of Physical and Chemical Research (RIKEN) Wako-shi Saitama 351-0198 Japan Institute for Theoretical and Applied Electrodynamics Russian Academy of Sciences 125412 Moscow Russia Department of Physics Loughborough University Loughborough LE11 3TU United Kingdom Department of Physics Center for Theoretical Physics Applied Physics Program Center for the Study of Complex Systems The University of Michigan Ann Arbor Michigan 48109-1040 USA

We describe the interaction between an electromagnetic field and a long Josephson junction driven by a dc current. We calculate the amplitudes of emission and absorption of light via the creation and annihilation of quantized Josephson plasma waves (JPWs). Both the energies of JPW quanta and the amplitudes of light absorption and emission strongly depend on the junction’s length and can be tuned by an applied dc current. Moreover, photon-assisted macroscopic quantum tunneling in long Josephson junctions shows resonances when the frequency of the outside radiation coincides with the current-driven eigenfrequencies of the quantized JPWs.

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Electronic properties of armchair graphene nanoribbons

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Physical Review B 2009年第12期79卷 125420-125420页

作者： A. V. Rozhkov S. Savel’ev Franco Nori Institute for Theoretical and Applied Electrodynamics Russian Academy of Sciences 125412 Moscow Russia Advanced Science Institute The Institute of Physical and Chemical Research (RIKEN) Wako-shi Saitama 351-0198 Japan Department of Physics Loughborough University Loughborough LE11 3TU United Kingdom Department of Physics Center for Theoretical Physics Applied Physics Program Center for the Study of Complex Systems The University of Michigan Ann Arbor Michigan 48109-1040 USA

We investigate the electronic band structure of an undoped graphene armchair nanoribbon. We demonstrate that such nanoribbon always has a gap in its electronic spectrum. Even if the parameters of the noninteracting Hamiltonian are fine tuned to a point where single-electron calculations predict a metallic dispersion, the system becomes unstable toward the spontaneous deformation of the carbon-carbon bonds dangling at the edges of the nanoribbon. This deformation produces a spectral gap. However, to directly observe this instability it is necessary to have a precise control over the parameters of the system, which is rarely possible in practice. As a result, the nanoribbon’s Hamiltonian deviates from the instability point. This deviation plays the role of an effective external field biasing the instability in a particular direction. Since the radicals passivating the edge affect the dangling bonds, one may vary this field to some extent by choosing different radicals for passivation. Unfortunately, this approach lacks the accuracy required for a thorough cancellation of the effective field. Disordering the effective field is a more convenient tool of controlling the electronic properties. Such disorder can be introduced through random substitution of the radicals passivating the edges by different radicals. We show that disorder could tune a nanoribbon of finite length back to the gapless regime. This would significantly influence the electronic properties of the system. Specifically, we show that the electrical transport through a nanoribbon is strongly affected by edge disorder.

关键词： band structure dangling bonds graphene nanostructured materials

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