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Quantum Measurements and Quantum Metrology

Ed. by Paternostro, Mauro

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2299-114X
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Requirements for two-source entanglement concentration

Mihai Vidrighin
  • Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
  • QOLS, Blackett Laboratory, Imperial College London, London SW7 2BW, United Kingdom
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/ Tim J. Bartley
  • Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
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/ Gaia Donati
  • Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
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/ Xian-Min Jin
  • Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
  • Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, PR China
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/ Marco Barbieri
  • Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
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/ W. Steven Kolthammer
  • Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
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/ Animesh Datta
  • Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
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/ Ian A. Walmsley
  • Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
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Published Online: 2013-02-13 | DOI: https://doi.org/10.2478/qmetro-2013-0002

Abstract

Entanglement enhancement is a key task for quantum technologies. This operation performed on states produced by parametric down-conversion sources has been the object of several recent experimental investigations. In particular, conditional preparation by photon-subtraction has been shown to improve the entanglement of these states. Here we analyse the role played by non-Gaussian and Gaussian measurements in more general entanglement concentration operations performed on a pair of two-mode squeezed vacua. We find stringent requirements for achieving an improved entanglement enhancement by measuring jointly these two resource states.

Keywords: entaglement distillation; non-Gaussian measurements; quantum optics

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About the article


Received: 2012-12-12

Accepted: 2013-01-24

Published Online: 2013-02-13


Citation Information: Quantum Measurements and Quantum Metrology, Volume 1, Pages 5–11, ISSN (Online) 2299-114X, DOI: https://doi.org/10.2478/qmetro-2013-0002.

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