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  • Articles  (11)
  • Quantum information  (11)
  • 2015-2019  (11)
  • Reviews of Modern Physics  (11)
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  • 1
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    Macroscopic quantum states: Measures, fragility, and implementations (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-01
    Description: Author(s): Florian Fröwis, Pavel Sekatski, Wolfgang Dür, Nicolas Gisin, and Nicolas Sangouard Schrödinger’s thought experiment of a cat in superposition of being dead and alive. [Rev. Mod. Phys. 90, 025004] Published Thu May 31, 2018
    Keywords: Quantum information
    Print ISSN: 0034-6861
    Electronic ISSN: 1539-0756
    Topics: Physics
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  • 2
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    Adiabatic quantum computation (2018)
    American Physical Society (APS)
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    Publication Date: 2018-01-30
    Description: Author(s): Tameem Albash and Daniel A. Lidar The simple act of slowly varying the parameters of a quantum system so that it remains always in its ground state is extremely rich from an information processing point of view. For an ideal, closed system, this adiabatic evolution is equivalent to full quantum computation, and it is convenient for establishing quantum algorithms for optimization. This review presents adiabatic quantum algorithms, proves the closed-system equivalence of the adiabatic and circuit models of quantum computation, reviews the placement of adiabatic quantum computation in the more general classification of computational complexity theory, and discusses the case of “stoquastic” quantum evolutions. [Rev. Mod. Phys. 90, 015002] Published Mon Jan 29, 2018
    Keywords: Quantum information
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  • 3
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    Quantum-enhanced measurements without entanglement (2018)
    American Physical Society (APS)
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    Publication Date: 2018-09-06
    Description: Author(s): Daniel Braun, Gerardo Adesso, Fabio Benatti, Roberto Floreanini, Ugo Marzolino, Morgan W. Mitchell, and Stefano Pirandola Entangled quantum states can enhance measurement precision. But quantum mechanics harbors other possibilities for enhancing precision, including some that have nothing to do with entanglement. This review surveys various strategies with unentangled probes by which measurements have been improved. Among the approaches considered are those that rely on particle statistics and correlations in highly mixed states. Often nonentangled states are more robust, and these approaches are feasible in current experiments: here the current states of research are shown in cold atoms, nonlinear optics, and nanomechanical oscillators. [Rev. Mod. Phys. 90, 035006] Published Wed Sep 05, 2018
    Keywords: Quantum information
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  • 4
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    Quantum metrology with nonclassical states of atomic ensembles (2018)
    American Physical Society (APS)
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    Publication Date: 2018-09-06
    Description: Author(s): Luca Pezzè, Augusto Smerzi, Markus K. Oberthaler, Roman Schmied, and Philipp Treutlein Entanglement is the basis of quantum technologies aimed at revolutionizing measurements, computing, and communications. This article reviews methods to improve measurement precision and sensitivity by harnessing entangled states of many atomic probe particles. The achievements of different experimental entanglement schemes are presented with theoretical analyses of their fundamental and practical limits, discussing prospects for applications in clocks, frequency standards, and measurements of forces and fields. [Rev. Mod. Phys. 90, 035005] Published Wed Sep 05, 2018
    Keywords: Quantum information
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  • 5
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    Entropic uncertainty relations and their applications (2017)
    American Physical Society (APS)
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    Publication Date: 2017-02-14
    Description: Author(s): Patrick J. Coles, Mario Berta, Marco Tomamichel, and Stephanie Wehner The Heisenberg uncertainty principle has a more precise formulation in terms of inequalities involving quantum entropies. Currently known entropic uncertainty relations are presented; they capture and extend Heisenberg’s idea of the unpredictability of the outcomes of incompatible measurements. Distinct results are obtained for finite- and infinite-dimensional Hilbert spaces. Applications are surveyed, including the formulation of entanglement witnesses, current ideas about wave-particle duality, and the analysis of quantum cryptography. [Rev. Mod. Phys. 89, 015002] Published Mon Feb 06, 2017
    Keywords: Quantum information
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  • 6
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    Quantum random number generators (2017)
    American Physical Society (APS)
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    Publication Date: 2017-02-23
    Description: Author(s): Miguel Herrero-Collantes and Juan Carlos Garcia-Escartin In mathematics and computer science, random numbers have the role of a resource for assisting proofs, making cryptography secure, and enabling computational protocols. This role motivates efforts to produce random numbers as a physical process. Potential physical sources abound, but arguably the most fundamental are those based on elementary quantum mechanical processes. This review discusses the current status of devices that generate quantum random numbers. [Rev. Mod. Phys. 89, 015004] Published Wed Feb 22, 2017
    Keywords: Quantum information
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  • 7
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    Quantum sensing (2017)
    American Physical Society (APS)
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    Publication Date: 2017-07-26
    Description: Author(s): C. L. Degen, F. Reinhard, and P. Cappellaro Quantum technologies are increasingly driving the field of precision metrology. While current techniques for sensing and recording time rely on classical devices, quantum sensors exploit quantum systems to reach unprecedented levels of precision. The working part of the sensor contains one or a few qubits, and resources like quantum entanglement are chosen and tailored to maximize sensitivity. This review introduces quantum sensing from the perspective of working experimentalists, with specific sensor implementations, concepts and methods, and recent developments. [Rev. Mod. Phys. 89, 035002] Published Tue Jul 25, 2017
    Keywords: Quantum information
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  • 8
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    Dynamics of non-Markovian open quantum systems (2017)
    American Physical Society (APS)
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    Publication Date: 2017-01-24
    Description: Author(s): Inés de Vega and Daniel Alonso This review gives a summary of the many techniques that are used in the analysis of open quantum systems. Emphasis is on those cases where it is unsuitable to use a memoryless or Markovian point of view, generally because there is no large separation of time scales between system and environment dynamics. The approaches reviewed include master equations, Heisenberg equations of motion, chain mapping representations, and various stochastic methods such as path integral Monte Carlo and stochastic equations. Guidance is given on how to evaluate the suitability of each of these methods for application in different physical problems. [Rev. Mod. Phys. 89, 015001] Published Fri Jan 20, 2017
    Keywords: Quantum information
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  • 9
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    Quantum memories at finite temperature (2016)
    American Physical Society (APS)
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    Publication Date: 2016-11-16
    Description: Author(s): Benjamin J. Brown, Daniel Loss, Jiannis K. Pachos, Chris N. Self, and James R. Wootton While the typical scenario for quantum error correction involves active intervention there are advantages to a passive quantum memory, for which a suitably designed interaction Hamiltonian will naturally protect the coherence of low-lying states from decoherence induced by a thermal environment. This review summarizes and discusses the various theoretical attempts to find a workable scenario for a passive quantum memory. [Rev. Mod. Phys. 88, 045005] Published Tue Nov 15, 2016
    Keywords: Quantum information
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  • 10
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    Quantum error correction for quantum memories (2015)
    American Physical Society (APS)
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    Publication Date: 2015-04-08
    Description: Author(s): Barbara M. Terhal It may seem inevitable that highly entangled quantum states are susceptible to disturbance through interaction with a decohering environment. However, certain multiqubit entangled states are well protected from common forms of decoherence as the quantum information is hidden in inherently nonlocal d... [Rev. Mod. Phys. 87, 307] Published Tue Apr 07, 2015
    Keywords: Quantum information
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  • 11
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    Cavity-based quantum networks with single atoms and optical photons (2015)
    American Physical Society (APS)
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    Publication Date: 2015-12-03
    Description: Author(s): Andreas Reiserer and Gerhard Rempe A vision has formed in recent years of the components necessary for a large-scale quantum network. Single trapped atoms can serve as the nodes of this network, with the links established by flying photons that are coupled to the atoms using optical resonators. This review describes progress towards the goal of multinode networks using the current generation of experiments, which have achieved unprecedented levels of atomic qubit control and light-matter coupling efficiencies. [Rev. Mod. Phys. 87, 1379] Published Tue Dec 01, 2015
    Keywords: Quantum information
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