Chinese Journal of Quantum Electronics, Volume. 28, Issue 5, 583(2011)
A class of optimal phase-covariant quantum cloning
The phase-covariant quantum cloning has an important application in quantum cryptography. By exploiting a general unitary transformation, the fidelity of clones is derived. The result shows that there exists a class of optimal phase-covariant quantum cloning. For these explicit transformations of the phase-covariant quantum cloning, the fidelity of clones is maximal and equal. Based on the cavity quantum electrodynamics, a scheme to implement the transformations of quantum cloning is proposed.
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ZHANG Wen-hai, DAI Jie-lin, CAO Zhuo-liang, YANG Ming. A class of optimal phase-covariant quantum cloning[J]. Chinese Journal of Quantum Electronics, 2011, 28(5): 583
Received: Sep. 25, 2010
Accepted: --
Published Online: Sep. 27, 2011
The Author Email: Wen-hai ZHANG (zhangwenhaianhui@yahoo.com.cn)