Chinese Journal of Quantum Electronics, Volume. 32, Issue 4, 438(2015)
Optimal phase-covariant quantum cloning
In quantum information science, quantum cloning theory is a basic one that provides an absolute security of quantum cryptography. The explicit transformation of the optimal 1→M=d+1 phase-covariant quantum cloning in d dimensions was derived and then this kind of cloning machine to the 1→M=kd+1 (for integer k) case was generized and the explicit transformation was obtained. By exploiting the formulation of the nonoptimal 2→M=2k+1 phase-covariant quantum cloning in 2 dimensions, the optimal cloning transformation was derived. The copy fidelities of the two kinds of cloning machines are coincident with the theoretical values found.
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ZHANG Gang, PAN Guozhu, YUAN Hao. Optimal phase-covariant quantum cloning[J]. Chinese Journal of Quantum Electronics, 2015, 32(4): 438
Received: Apr. 1, 2015
Accepted: --
Published Online: Nov. 30, 2015
The Author Email: Gang ZHANG (zhanggang@wxc.edu.cn)