Open AccessEntanglement Protection of Two‐Qubit System in Non‐Markovian Reservoir via Weak Measurement and Weak Measurement Reversal
Author(s) -
Guo Xiuli,
Zhang Yanliang,
Kang Guodong,
Zhou Qingping
Publication year - 2019
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2018.06.004
Subject(s) - qubit , quantum entanglement , weak measurement , markov process , statistical physics , physics , quantum mechanics , mathematics , quantum , statistics
The protection schemes of the entanglement in the system of two entangled atoms from nonMarkovian reservoirs via previous Weak measurement (pre‐WM) and posterior Weak measurement reversal (post‐WMR) are investigated. We firstly compare the effects of combination applying of pre‐WM and post‐WMR (scheme 1) and twice Weak measurements (WMs) (scheme 2) in the condition of different initial entangled states. The analysis indicates that the protection performance of scheme 1 is much better than that of scheme 2. The scheme 1 was utilized when the system of two entangled atoms suffers from the independent reservoirs. The numerical results show that the combination of pre‐WM and post‐WMR can effectively enhance entanglement and shorten the time of Entanglement sudden death (ESD) in non‐Makovain environment. We have found the optimum of WM strengthens is drastically related to the initial entangled state.