Experimental Quantum Cloning with Prior Partial Information

Jiangfeng Du, Thomas Durt, Ping Zou, Hui Li, L. C. Kwek, C. H. Lai, C. H. Oh, and Artur Ekert

Phys. Rev. Lett. 94, 040505 – Published 2 February 2005

Abstract

When prior partial information about a state to be cloned is available, it can be cloned with a fidelity higher than that of universal quantum cloning. We experimentally verify this intriguing relationship between the cloning fidelity and the prior information by reporting the first experimental optimal quantum state-dependent cloner, using nuclear magnetic resonance techniques. Our experiments may further cast important implications into many quantum information processing protocols.

Received 17 May 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.040505

Authors & Affiliations

Jiangfeng Du^1,2,*, Thomas Durt³, Ping Zou¹, Hui Li¹, L. C. Kwek⁴, C. H. Lai², C. H. Oh², and Artur Ekert^2,5

¹Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
²Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
³TONA-TENA Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium
⁴Department of Natural Sciences, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616
⁵Centre for Quantum Computation, DAMTP, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom

^*Electronic address: djf@ustc.edu.cn

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Vol. 94, Iss. 4 — 4 February 2005

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