Optimal quantum cloning via spin networks

Journal Article · Fri Sep 15 00:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.034303· OSTI ID:20857777

Qing, Chen ^[1]; Jianhua, Cheng; Kelin, Wang ^[2]; Jiangfeng, Du ^[1]

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1. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China)
2. Department of Modern Physics, University of Science and Technology of China, Hefei 230026 (China)

In this paper we demonstrate that optimal 1{yields}M phase-covariant cloning quantum cloning is available via free dynamical evolution of spin networks. By properly designing the network and the couplings between spins, we show that optimal 1{yields}M phase-covariant cloning can be achieved if the initial state is prepared as a specific symmetric state. Especially, when M is an odd number, the optimal phase-covariant cloning can be achieved without ancillas. Moreover, we demonstrate that the same framework is capable for optimal 1{yields}2 universal cloning.

• OSTI ID: 20857777
• Journal Information: Physical Review. A, Vol. 74, Issue 3; Other Information: DOI: 10.1103/PhysRevA.74.034303; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COUPLING
DATA TRANSMISSION
ENERGY LEVELS
QUANTUM COMPUTERS
QUANTUM MECHANICS
QUANTUM NUMBERS
SPIN