Large-amplitude coherent-state superposition generated by a time-separated two-photon subtraction from a continuous-wave squeezed vacuum

Masahiro Takeoka, Hiroki Takahashi, and Masahide Sasaki
Phys. Rev. A 77, 062315 – Published 12 June 2008

Abstract

A theoretical analysis is given for a two-photon subtraction from a continuous-wave squeezed vacuum with finite time separation between two detection events. In the cw photon subtraction process, generated states are inevitably described by temporal multimode states. Our approach is based on analytical formulas that are mathematically simple and provide an intuitive understanding of the multimode structure of the system. We show that, in our process, the photon-subtracted squeezed vacuum is generated in two temporal modes and one of these modes acts as an ancillary mode to make the other one a large-amplitude coherent-state superposition.

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  • Received 3 April 2008

DOI:https://doi.org/10.1103/PhysRevA.77.062315

©2008 American Physical Society

Authors & Affiliations

Masahiro Takeoka1,2, Hiroki Takahashi1,2,3, and Masahide Sasaki1,2

  • 1National Institute of Information and Communications Technology, 4-2-1 Nukui-Kita, Koganei, Tokyo 184-8795, Japan
  • 2CREST, Japan Science and Technology Agency, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
  • 3Department of Applied Physics, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

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Issue

Vol. 77, Iss. 6 — June 2008

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