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Proceedings Paper

Quantum state engineering with entangled squeezed states and photon number detector
Author(s): Akira Kitagawa; Katsuji Yamamoto; Koji Nagata; Masahiro Takeoka; Masahide Sasaki
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Paper Abstract

The photon subtraction operation is an effective method to enhance an entanglement of the two-mode squeezed vacuum state. We show that it can be well approximated to the two-mode squeezed state with an enhanced squeezing although it is basically a mixed and non-Gaussian state. Such property can be directly observed by the current technology. We also study the continuous variable quantum dense coding with the photon subtracted two-mode squeezed state. It is shown that, in particular squeezing region, its error probability performance can be greatly improved from the original two-mode squeezed state. Since quantum dense coding is the protocol to transmit classical information, our analysis provides an alternative operational meaning of the entanglement involved in the on-off photon subtracted state, compared to the previous results, such as teleportation or the nonlocality, that could help to quantify the entanglement of mixed and non-Gaussian states.

Paper Details

Date Published: 11 January 2005
PDF: 8 pages
Proc. SPIE 5631, Quantum Optics and Applications in Computing and Communications II, (11 January 2005); doi: 10.1117/12.580852
Show Author Affiliations
Akira Kitagawa, National Institute of Information and Communications Technology (Japan)
CREST, Japan Science and Technology Agency (Japan)
Katsuji Yamamoto, Kyoto Univ. (Japan)
Koji Nagata, National Institute of Information and Communications Technology (Japan)
CREST, Japan Science and Technology Agency (Japan)
Masahiro Takeoka, National Institute of Information and Communications Technology (Japan)
CREST, Japan Science and Technology Agency (Japan)
Masahide Sasaki, National Institute of Information and Communications Technology (Japan)
CREST, Japan Science and Technology Agency (Japan)


Published in SPIE Proceedings Vol. 5631:
Quantum Optics and Applications in Computing and Communications II
Guang-Can Guo; Hoi-Kwong Lo; Masahide Sasaki; Songhao Liu, Editor(s)

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