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Quantum Information Processing
Published in: Quantum Information Processing 1/2016

01-01-2016

Geometric measure of quantum discord with weak measurements

Authors: Lei Li, Qing-Wen Wang, Shu-Qian Shen, Ming Li

Published in: Quantum Information Processing | Issue 1/2016

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Abstract

Super quantum discord based on weak measurements was introduced by Singh and Pati (Ann Phys 343:141–152, 2014). We propose a geometric way of quantifying quantum discord with weak measurements. It is shown that this geometric measure of quantum discord with weak measurements (GQDW) is linearly dependent on geometric measure of quantum discord (Dakic et al. in Phys Rev Lett 105:190502, 2010) and only captures partial quantumness of the states. It is found that the quantum correlation can be extracted by a sequence of infinitesimal weak measurements. Finally, the level surfaces of GQDW for Bell-diagonal states are depicted and the results are demonstrated by explicit example.
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Metadata
Title
Geometric measure of quantum discord with weak measurements
Authors
Lei Li
Qing-Wen Wang
Shu-Qian Shen
Ming Li
Publication date
01-01-2016
Publisher
Springer US
Published in
Quantum Information Processing / Issue 1/2016
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-015-1184-9

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