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Chinese Science Bulletin 2012年第18期57卷 2194-2199页

作者： WU ReBing ZHANG Jing LI ChunWen LONG GuiLu TARN TzyhJong Department of Automation Tsinghua UniversityBeijing 100084China Center for Quantum Information Science and Technology TNListBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China Electrical and Systems Engineering Department Washington University in St.LouisSt.LouisMissouri 63130USA

The past decade or two has witnessed tremendous progress in theory and practice of quantum control *** different scientific disciplines ranging from fundamental particle physics to nanotechnology,the goal of quantum control has been to develop effective and efficient tools for common analysis and design,but more importantly would pave the way for future technological *** article briefly reviews basic quantum control theory from the perspective of modeling,analysis and design,as well as considers future research directions.

关键词：量子系统控制技术粒子物理学学科范围纳米技术理论建模量子控制设计

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Feshbach projection-operator partitioning for quantum open systems: Stochastic approach

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Physical Review A 2012年第3期85卷 032123-032123页

作者： Jun Jing Lian-Ao Wu J. Q. You Ting Yu Center for Controlled Quantum Systems and Department of Physics and Engineering Physics Stevens Institute of Technology Hoboken New Jersey 07030 USA Ikerbasque Basque Foundation for Science 48011 Bilbao Spain Department of Theoretical Physics and History of Science Basque Country University (EHU/UPV) PO Box 644 48080 Bilbao Spain Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China

The dynamics of a state of interest coupled to a non-Markovian environment is studied by concatenating the non-Markovian quantum state diffusion equation and the Feshbach projection-operator partitioning technique. An exact one-dimensional stochastic master equation is derived as a general tool for controlling an arbitrary component of the system. We show that the exact one-dimensional stochastic master equation can be efficiently solved beyond the widely adapted second-order master equations. The generality and applicability of this hybrid approach is justified and exemplified by several coherence control problems concerning quantum state protection against leakage and decoherence.

关键词： OPERATOR theory quantum theory ENERGY levels (quantum mechanics) MARKOV processes PARTITIONS (Mathematics) STOCHASTIC differential equations -- Numerical solutions COHERENCE (Optics)

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Nonperturbative dynamical decoupling control: A spin-chain model

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Physical Review A 2012年第3期86卷 032303-032303页

作者： Zhao-Ming Wang Lian-Ao Wu Jun Jing Bin Shao Ting Yu Department of Physics Ocean University of China Qingdao 266100 China Department of Theoretical Physics and History of Science The Basque Country University (EHU/UPV) and IKERBASQUE Basque Foundation for Science 48011 Bilbao Spain Center for Controlled Quantum Systems and Department of Physics and Engineering Physics Stevens Institute of Technology Hoboken New Jersey 07030 USA Key Laboratory of Cluster Science of Ministry of Education and School of Physics Beijing Institute of Technology Beijing 10081 China

This paper considers a spin-chain model by numerically solving the exact model to explore the nonperturbative dynamical decoupling regime, where an important issue recently arose. Our study has revealed a few universal features of nonperturbative dynamical control irrespective of the types of environments and system-environment couplings. We have shown that, for the spin-chain model, there is a threshold and a large pulse parameter region where the effective dynamical control can be implemented, in contrast to the perturbative decoupling schemes where the permissible parameters are represented by a point or converge to a very small subset in the large parameter region admitted by our nonperturbative approach. An important implication of the nonperturbative approach is its flexibility in implementing the dynamical control scheme in an experimental setup. Our findings have exhibited several interesting features of the nonperturbative regimes such as the chain-size independence, pulse strength upper bound, noncontinuous valid parameter regions, etc. Furthermore, we find that our nonperturbative scheme is robust against randomness in model fabrication and time-dependent random noise.

关键词： NUCLEAR spin RANDOM noise theory PERTURBATION (Mathematics) NUMERICAL analysis ROBUST control MATHEMATICAL models physics experiments

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Single-Photon and Photon-Number-Resolving Detectors Integrated with Waveguide Circuits

Single-Photon and Photon-Number-Resolving Detectors Integrat...

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Conference on Lasers and Electro-Optics Europe

作者： D. Sahin A. Gaggero P. Jiang Z. Zhou S. Jahanmirinejad F. Mattioli R. Leoni J. Beetz M. Lermer M. Kamp S. Hofling M. Thompson A. Fiore COBRA Research Institute Eindhoven University of Technology PO Box 513. 5600 MB Eindhoven. The Netherlands Tstituto di Fotonica e Nanotecnologie. CNR. Via Cineto Romano 42 00156 Roma. Italy Centre for Quantum Photonics. H. H. Wills Physics Laboratoiy & Department of Electrical and Electronic Engineering University of Bristol Merchant Venturers Building Woodland Road. Bristol BS8 1UB UK Technische Physik and Wilhelm Conrad Röntgen Research Center for Complex Material Systems. Universität Würzburg. Am Hubland. D-97074 Würzburg Germany

ISBN: (纸本)9781479905942

The integration of single-photon and photon-number-resolving detectors with single-photon sources and passive circuits is essential to realise fully-functional quantum photonic integrated circuits. We have recently demonstrated the first waveguide single photon detectors (WSPDs) [1] and a polarisation-independent on-chip autocorrelator for the measurement of the second-order correlation function g~(2)(τ) [2], based on superconducting NbN nanowires on top of a GaAs/AlGaAs ridge waveguide.

关键词： Gallium arsenide Multimode interference Nanowires Scanning electron microscopy Single photon detectors Superconductors

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Decoherence suppression via non-Markovian coherent feedback control

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Physical Review A 2012年第5期86卷 052304-052304页

作者： Shi-Bei Xue Re-Bing Wu Wei-Min Zhang Jing Zhang Chun-Wen Li Tzyh-Jong Tarn Department of Automation Tsinghua University Beijing 100084 People's Republic of China Center for Quantum Information Science and Technology TNList Beijing 100084 People's Republic of China Department of Physics and Center for Quantum Information Science National Cheng Kung University Tainan 70101 Taiwan Department of Electrical and Systems Engineering Washington University St. Louis Missouri 63130 USA

In this paper, we present a coherent feedback control scheme for non-Markovian bosonic systems, in which an engineered quantum control field is introduced to couple both the system and the noise bath. The closed-loop dynamics of the system is described by an exact non-Markovian quantum Langevin equation, where the spectral density functions of the noise and the quantum control field, as well as their coupling, are combined into a single memory kernel function. We show that the coupling between the quantum control field with the noise bath can be used as a feedback control to modulate the memory kernel function. As a result, the noise bath can be driven out of resonance with the system and the decoherence can be efficiently suppressed. The effectiveness of the controllability is demonstrated with a photonic circuit in photonic crystals.

关键词： FEEDBACK control systems LANGEVIN equations SPECTRAL energy distribution NOISE control COUPLINGS (Gearing) KERNEL functions

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Evading quantum Mechanics: engineering a Classical Subsystem within a quantum Environment

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Physical Review X 2012年第3期2卷 031016-031016页

作者： Mankei Tsang Carlton M. Caves Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117583 Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117551 Center for Quantum Information and Control University of New Mexico MSC07-4220 Albuquerque New Mexico 87131-0001 USA Centre for Engineered Quantum Systems School of Mathematics and Physics The University of Queensland St. Lucia Brisbane 4072 Australia

quantum mechanics is potentially advantageous for certain information-processing tasks, but its probabilistic nature and requirement of measurement backaction often limit the precision of conventional classical information-processing devices, such as sensors and atomic clocks. Here we show that, by engineering the dynamics of coupled quantum systems, it is possible to construct a subsystem that evades the measurement backaction of quantum mechanics, at all times of interest, and obeys any classical dynamics, linear or nonlinear, that we choose. We call such a system a quantum-mechanics-free subsystem (QMFS). All of the observables of a QMFS are quantum-nondemolition (QND) observables; moreover, they are dynamical QND observables, thus demolishing the widely held belief that QND observables are constants of motion. QMFSs point to a new strategy for designing classical information-processing devices in regimes where quantum noise is detrimental, unifying previous approaches that employ QND observables, backaction evasion, and quantum noise cancellation. Potential applications include gravitational-wave detection, optomechanical-force sensing, atomic magnetometry, and classical computing. Demonstrations of dynamical QMFSs include the generation of broadband squeezed light for use in interferometric gravitational-wave detection, experiments using entangled atomic-spin ensembles, and implementations of the quantum Toffoli gate.

关键词： Optics quantum physics quantum Information

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Absolute maximal entanglement and quantum secret sharing

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Physical Review A 2012年第5期86卷 052335-052335页

作者： Wolfram Helwig Wei Cui José Ignacio Latorre Arnau Riera Hoi-Kwong Lo Center for Quantum Information and Quantum Control (CQIQC) Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Ontario M5S 3G4 Canada Departament d’Estructura i Constituents de la Matèria Universitat de Barcelona 647 Diagonal 08028 Barcelona Spain Max Planck Institute for Gravitational Physics Albert Einstein Institute Am Mühlenberg 1 D-14476 Golm Germany Dahlem Center for Complex Quantum Systems Freie Universität Berlin 14195 Berlin Germany

We study the existence of absolutely maximally entangled (AME) states in quantum mechanics and its applications to quantum information. AME states are characterized by being maximally entangled for all bipartitions of the system and exhibit genuine multipartite entanglement. With such states, we present a parallel teleportation protocol which teleports multiple quantum states between groups of senders and receivers. The notable features of this protocol are that (i) the partition into senders and receivers can be chosen after the state has been distributed, and (ii) one group has to perform joint quantum operations while the parties of the other group only have to act locally on their system. We also prove the equivalence between pure state quantum secret sharing schemes and AME states with an even number of parties.

关键词： quantum entanglement quantum information theory quantum teleportation INFORMATION sharing DISTRIBUTION (Probability theory)

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Spin-3 quasinormal modes of the BTZ black hole

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Physical Review D 2012年第8期85卷 084007-084007页

作者： Yun Soo Myung Yong-Wan Kim Young-Jai Park Institute of Basic Science and School of Computer Aided Science Inje University Gimhae 621-749 Korea Department of Physics and Center for Quantum Spacetime Sogang University Seoul 121-742 Korea Department of Service Systems Management and Engineering Sogang University Seoul 121-742 Korea

Using the operator approach, we obtain quasinormal modes (QNMs) of the Bañados-Teitelboim-Zanelli black hole in spin-3 topologically massive gravity by solving the first-order equation of motion with the transverse-traceless condition. We find that these are different from those obtained when solving the second-order differential equation for the third-rank tensor of spin-3 field subject to suitable boundary conditions and having the sign ambiguity of mass. However, it is shown clearly that two approaches to the left-moving QNMs are identical, while the right-moving QNMs of solving the second-order equation are given by descendants of the operator approach.

关键词： BLACK holes (Astronomy) NUCLEAR spin ASTROphysics GRAVITY DIFFERENTIAL equations BOUNDARY value problems OPERATOR theory

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Reduced decoherence in non-markovian systems lacking decoherence free subspaces

Reduced decoherence in non-markovian systems lacking decoher...

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Laser Science, LS 2011

作者： Broadbent, C.J. Jing, J. Yu, T. Eberly, J.H. Rochester Theory Center Department of Physics and Astronomy University of Rochester Rochester NY 14627 United States Center for Controlled Quantum Systems Department of Physics and Engineering Physics Stevens Institute of Technology Hoboken NJ 07030 United States

By numerically simulating the exact master equation for the degenerate vee-type threelevel systems, we demonstrate the existence of states with drastically reduced decoherence in an open quantum systems which does not... 详细信息

ISBN: (纸本)9781557529176

关键词： quantum optics

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Dynamics of interacting qubits coupled to a common bath: Non-Markovian quantum-state-diffusion approach

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Physical Review A 2011年第3期84卷 032101-032101页

作者： Xinyu Zhao Jun Jing Brittany Corn Ting Yu []Center for Controlled Quantum Systems and the Department of Physics and Engineering Physics Stevens Institute of Technology Hoboken New Jersey 07030 USA

Non-Markovian dynamics is studied for two interacting qubits strongly coupled to a dissipative bosonic environment. We derive a non-Markovian quantum-state-diffusion (QSD) equation for the coupled two-qubit system without any approximations, and in particular, without the Markov approximation. As an application and illustration of our derived time-local QSD equation, we investigate the temporal behavior of quantum coherence dynamics. In particular, we find a strongly non-Markovian regime where entanglement generation is significantly modulated by the environmental memory. Additionally, we study residual entanglement in the steady state by analyzing the steady-state solution of the QSD equation. Finally, we discuss an approximate QSD equation.

关键词： particular Additionally equation ILLUSTRATIONS Baths Entanglement approximation dynamics Steady state

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