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Realization of Optimal Universal and Phase-Covariant Quantum Machines via Input-Output Cavities |
WANG Cong-Rong1, LI Da-Chuang1,2**, ZHANG Feng-Yuan1, XU Rui-Min1 |
1School of Electronics and Information Engineering, Hefei Normal University, Hefei 230601
2Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026 |
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Cite this article: |
WANG Cong-Rong, LI Da-Chuang, ZHANG Feng-Yuan et al 2013 Chin. Phys. Lett. 30 030302 |
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Abstract We present a scheme to realize a special quantum cloning machine via input-output cavities. The cloning machine can copy information from one atom to another distant atom. Choosing different parameters, the method can perform optimal symmetric (asymmetric) universal quantum cloning and optimal symmetric (asymmetric) phase-covariant cloning. Compared to previous schemes, our scheme is more insensitive to actual environmental noise and can get higher fidelity in a current cavity quantum electrodynamics system with an entangled state acting as a quantum channel than a single-photon pulse.
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Received: 10 December 2012
Published: 29 March 2013
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PACS: |
03.67.-a
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(Quantum information)
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03.67.Lx
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(Quantum computation architectures and implementations)
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42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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