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Universal Quantum Cloning Machines for Two Identical Mixed Qubits |
| YANG Shuai;ZHAO Mei-Sheng;LIU Nai-Le;CHEN Zeng-Bing |
| Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026 |
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YANG Shuai, ZHAO Mei-Sheng, LIU Nai-Le et al 2007 Chin. Phys. Lett. 24 3048-3050 |
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Abstract We present a series of universal quantum cloning machines for two identical mixed qubits. Every machine is optimal in the sense that it achieves the optimal bound of the single copy shrinking factor. Unlike in the case of pure state cloning, the single copy shrinking factor does not uniquely determine the cloning map in the case of mixed state cloning.
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03.67.Ca
03.65.Ta
89.70.+c
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Received: 22 June 2007
Published: 23 October 2007
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