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Entropy 2015, 17(6), 4293-4322; doi:10.3390/e17064293

Concurrence Measurement for the Two-Qubit Optical and Atomic States

1,2
and
2,3,*
1
College of Mathematics & Physics, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
2
Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing 210003, China
3
Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jay Lawrence
Received: 27 March 2015 / Revised: 9 June 2015 / Accepted: 16 June 2015 / Published: 19 June 2015
(This article belongs to the Section Quantum Information)
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Abstract

Concurrence provides us an effective approach to quantify entanglement, which is quite important in quantum information processing applications. In the paper, we mainly review some direct concurrence measurement protocols of the two-qubit optical or atomic system. We first introduce the concept of concurrence for a two-qubit system. Second, we explain the approaches of the concurrence measurement in both a linear and a nonlinear optical system. Third, we introduce some protocols for measuring the concurrence of the atomic entanglement system. View Full-Text
Keywords: quantum entanglement; concurrence; quantum nondemolition measurement quantum entanglement; concurrence; quantum nondemolition measurement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhou, L.; Sheng, Y.-B. Concurrence Measurement for the Two-Qubit Optical and Atomic States. Entropy 2015, 17, 4293-4322.

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