Quantum state engineering with entangled squeezed states and photon number detector

Akira Kitagawa, Katsuji Yamamoto, Koji Nagata, Masahiro Takeoka, Masahide Sasaki

研究成果: Conference article査読


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.

ジャーナルProceedings of SPIE - The International Society for Optical Engineering
出版ステータスPublished - 2005
イベントQuantum Optics and Applications in Computing and Communications II - Beijing, China
継続期間: 2004 11月 102004 11月 12

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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