Cited by 1,419Quantum Information and CryptographyQuantum Mechanics and ApplicationsQuantum many-body systems

Entanglement measures and purification procedures

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Vedral, V., Plenio, M. B.·1998·Physical Review A

Abstract

We improve previously proposed conditions each measure of entanglement has to satisfy. We present a class of entanglement measures that satisfy these conditions and show that the quantum relative entropy and Bures metric generate two measures of this class. We calculate the measures of entanglement for a number of mixed two spin-1/2 systems using the quantum relative entropy, and provide an efficient numerical method to obtain the measures of entanglement in this case. In addition, we prove a number of properties of our entanglement measure that have important physical implications. We briefly explain the statistical basis of our measure of entanglement in the case of the quantum relative entropy. We then argue that our entanglement measure determines an upper bound to the number of singlets that can be obtained by any purification procedure.

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Crossref · 10.1103/physreva.57.1619

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  • The relative entropy is another quantifier of quantum correlations in MPS, defined as the distance between ρ and the density matrix σ of the closest disentangled state.

    “Another quantifier of quantum correlations in such states is the so called relative entropy [6] defined as the 'distance' between the density matrix ρ and the density matrix σ of the closest disentangled state”

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Research works printed but not linked: 5

  1. ͓2͔ A. K. Ekert, Ph.D. thesis, Clarendon Laboratory, Oxford, 1991.
  2. ͓5͔ A. Uhlmann, lanl e-print quant-ph/9704017. · arXiv
  3. ͓10͔ M. Reed and B. Simon, Methods of Modern Mathematical Physics-Functional Analysis ͑Academic Press, New York, 1980͒.
  4. M. J. Donald, Math. Proc. Camb. Philos. Soc. 101, 363 ͑1987͒.
  5. ͓25͔ M. Hayashi, lanl e-print quant-ph/9704040 1997. · arXiv

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Authors
Vedral, V., & Plenio, M. B.
Affiliations
Imperial College London (GB)
Venue
Physical Review A
Published
1998-03-01
Volume
57
Issue
3
Pages
1619-1633
ISSN
  • 0556-2791 (ISSN-L)
  • 1050-2947
  • 1094-1622
OpenAlex
W2025236523
Cited by
1,419
References
34
Citations by year
2026: 27 · 2025: 49 · 2024: 38 · 2023: 76 · 2022: 51 · 2021: 42 · 2020: 44 · 2019: 60 · 2018: 58 · 2017: 57 · 2016: 45 · 2015: 54 · 2014: 42 · 2013: 39 · 2012: 47
FWCI
55.54
Type
journal article
Language
en
Open access
Locations
  • Physical Review A (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
  • Spiral (Imperial College London) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Alexander von Humboldt-Stiftung
  • Engineering and Physical Sciences Research Council
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum many-body systems
Keywords
entanglement measures, purification procedure, quantum relative entropy, Bures metric, singlets, entanglement quantification

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