Abstract
Protection of entanglement from disturbance of the environment is an essential task in quantum information processing. We investigate the effect of the weak measurement and reversal (WMR) on the protection of the entanglement for an arbitrarily entangled two-qubit pure state from these three typical quantum noisy channels, i.e., amplitude damping channel, phase damping channel and depolarizing quantum channel. Given the parameters of the Bell-like initial qubits’ state |ψ〉 = a|00〉 + d|11〉, it is found that the WMR operation indeed helps for protecting distributed entanglement from the above three noisy quantum channels. But for the Bell-like initial qubits’ state |ϕ〉 = b|01〉 + c|10〉, the WMR operation only protects entanglement in the amplitude damping channel, not for the phase damping and depolarizing quantum channels. In addition, we discuss how the concurrence and the success probability behave with adjusting the weak or the reversal weak measurement strength.
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Acknowledgments
This project was supported by the National Natural Science Foundation of China (Grants No. 61605019 and No. 61505053), the Natural Science Foundation of Hunan Province, China (Grants No. 2015JJ6006, 2016JJ3015 and No. 2015JJ3092), and the Research Foundation of Education Bureau of Hunan Province, China (Grant No. 15C0937, 16B177 and No. 16C0113).
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Li, W., He, Z. & Wang, Q. Protecting Distribution Entanglement for Two-Qubit State Using Weak Measurement and Reversal. Int J Theor Phys 56, 2813–2824 (2017). https://doi.org/10.1007/s10773-017-3448-x
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DOI: https://doi.org/10.1007/s10773-017-3448-x