Quantum state engineering with entangled squeezed states and photon number detector

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

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish
Article number17
Pages (from-to)87-94
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2005
Externally publishedYes
EventQuantum Optics and Applications in Computing and Communications II - Beijing, China
Duration: 2004 Nov 102004 Nov 12


  • Continuous variable dense coding
  • Enhancement of entanglement
  • Non-Gaussian state generation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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