Concurrence Measurement for the Two-Qubit Optical and Atomic States

Entropy

Lan Zhou¹  Yu-Bo Sheng² 

[1] College of Mathematics & Physics, Nanjing University of Posts and Telecommunications, Nanjing 210003, China; E-Mail:;Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing 210003, China

关键词: quantum entanglement;    concurrence;    quantum nondemolition measurement;   

DOI  :  10.3390/e17064293

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland