Amplitude-Damping Decoherence Suppression of Two-Qubit Entangled States by Weak Measurements |
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| Authors: | Qiao-Yun Tan Lin Wang Jin-Xiang Li Jiao-Wen Tang Xin-Wen Wang |
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| Affiliation: | 1. Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, 421002, People’s Republic of China
2. Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha, 410081, People’s Republic of China
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| Abstract: | Taming decoherence is a critical issue in quantum information science. We here investigate amplitude-damping decoherence suppression of two-qubit entangled states by weak quantum measurements. It is shown that the weak measurements can effectively suppress the decoherence for different initial entangled states. More interestingly, we show that the weak measurements have different effects on the entanglement protection for two entangled states which are equivalent under a local unitary operation. This result implies that the entanglement protection effect could be modulated according to different demands. |
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