Preserving entanglement and the fidelity of three-qubit quantum states undergoing decoherence using weak measurement |
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| Authors: | Liao Xiang-Ping Fang Mao-Fa Fang Jian-Shu Zhu Qian-Quan |
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| Affiliation: | a College of Science, Hunan University of Technology, Zhuzhou 412008, China;b College of Physics and Information Science, Hunan Normal University, Changsha 410081, China |
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| Abstract: | We demonstrate a method to preserve entanglement and improve fidelity of three-qubit quantum states undergoing amplitude-damping decoherence using weak measurement and quantum measurement reversal.It is shown that we are able to enhance entanglement to the greatest extent,and to circumvent entanglement sudden death by increasing the weak measurement strength both for the GHZ state and the W state.The weak measurement technique can also enhance the fidelity to the quantum region and even close to 1 for the whole range of the decoherence parameter in both of the two cases.In addition,the W state can maintain more fidelity than the GHZ state in the protection protocol.However,the GHZ state has a higher success probability than the W state. |
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| Keywords: | entanglement protection quantum fidelity weak measurement |
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