Protecting Entanglement in a Common Phase Decoherence Environment using Weak Measurement and Quantum Measurement Reversal |
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| Authors: | Qiong Wang Jian-Sheng Tang Zhi He Ji-Bing Yuan |
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| Institution: | 1.College of Physics and Electronics,Hunan University of Arts and Science,Changde,China;2.Hunan Province Cooperative Innovation Center for The Construction and Development of Dongting Lake Ecological Economic Zone,Changde,China;3.Hunan Province Key Laboratory of Photoelectric Information Integration and Optical Manufacturing Technology,Changde,China;4.Hunan First Normal University,Changsha,China;5.College of Physics and Electronic Engineering,Hengyang Normal University,Hengyang,China |
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| Abstract: | Protection of entanglement from disturbance of the environment is an essential task in quantum information processing. We investigate the entanglement protection of a qubit-qubit system interacting with a phase decoherence reservoir by employing the weak measurement (WM) and quantum measurement reversal (QMR). We show explicitly that the quantum entanglement can be obviously protected by means of the proper WM and QMR. In particular, we found that there is a specific initial state parameter region, the entanglement protection ratio, which is determined only by the initial state parameter and independent of the form of the spectral density of the reservoir. |
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