期刊
PHYSICAL REVIEW A
卷 80, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.80.032306
关键词
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资金
- Scientific Research on Innovative Areas [20104003]
- LFPPI network
We propose a quantum cloning machine, which clones a qubit into two clones assuming known modulus of expectation value of Pauli sigma(z) matrix. The process is referred to as the mirror phase-covariant cloning for which the input state is a priori less known than that for the standard phase-covariant cloning. Analytical expressions describing the cloning transformation and fidelity of the clones are found. Extremal equations for the optimal cloning are derived and analytically solved by generalizing a method of Fiurasek [Phys. Rev. A 64, 062310 (2001)]. Quantum circuits implementing the optimal cloning transformation and their physical realization in a quantum-dot system are described.
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