Robustness of Entanglement During Decoherence |
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Authors: | KIMK wang-Il ZHAO Bao-Kui LI Hong-Mei LU Jing-Bin |
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Institution: | 1. College of Physics, Jilin University, Changchun 130012, China;
2. Department of Physics, Kim Il Sung University, Pyongyang, DPR Korea |
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Abstract: | Finding the most robust entangled states during the whole process of decoherence is a particularly fundamental problem for quantum physics and quantum information processing. In this paper, the decoherence process of two-qubit system under two individual identical decoherence channels is investigated systematically. We find that although the robustness of two-qubit states with same initial entanglement is usually different, the Bell-like states are always the most robust entangled states during decoherence. That is to say, affected by the same amount of noise, the remain entanglement of an arbitrary two-qubit state is not more than that of a Bell-like state with the same initial entanglement. |
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Keywords: | decoherence open systems entanglement |
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