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Phys. Rev. A 72, 042304 (2005) [7 pages]

Experimental demonstration of quantum teleportation of a squeezed state

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Nobuyuki Takei1,2, Takao Aoki1,2, Satoshi Koike1, Ken-ichiro Yoshino1, Kentaro Wakui1,2,3, Hidehiro Yonezawa1,2, Takuji Hiraoka1, Jun Mizuno2,3, Masahiro Takeoka2,3, Masashi Ban2,4, and Akira Furusawa1,2
1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2CREST, Japan Science and Technology (JST) Agency, 1-9-9 Yaesu, Chuo-ku, Tokyo 103-0028, Japan
3National Institute of Information and Communication Technology (NICT), 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan
4Advanced Research Laboratory, Hitachi Ltd, 2520 Akanuma, Hatoyama, Saitama 350-0395, Japan

Received 7 November 2003; published 3 October 2005

Quantum teleportation of a squeezed state is demonstrated experimentally. Due to some inevitable losses in experiments, a squeezed vacuum necessarily becomes a mixed state which is no longer a minimum uncertainty state. We establish an operational method of evaluation for quantum teleportation of such a state using fidelity and discuss the classical limit for the state. The measured fidelity for the input state is 0.85±0.05 , which is higher than the classical case of 0.73±0.04 . We also verify that the teleportation process operates properly for the nonclassical state input and its squeezed variance is certainly transferred through the process. We observe the smaller variance of the teleported squeezed state than that for the vacuum state input.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.72.042304
DOI: 10.1103/PhysRevA.72.042304
PACS: 03.67.Hk, 03.65.Ud, 42.50.Dv

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