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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 11, Iss. 1 — Jan. 13, 2003
  • pp: 14–19

Experimental investigation of the intensity fluctuation joint probability and conditional distributions of the twin-beam quantum state

Yun Zhang, Katsuyuki Kasai, and Masayoshi Watanabe  »View Author Affiliations

Optics Express, Vol. 11, Issue 1, pp. 14-19 (2003)

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We give the intensity fluctuation joint probability of the twin-beam quantum state, which was generated with an optical parametric oscillator operating above threshold. Then we present what to our knowledge is the first measurement of the intensity fluctuation conditional probability distributions of twin beams. The measured inference variance of twin beams 0.62±0.02, which is less than the standard quantum limit of unity, indicates inference with a precision better than that of separable states. The measured photocurrent variance exhibits a quantum correlation of as much as -4.9±0.2 dB between the signal and the idler.

© 2002 Optical Society of America

OCIS Codes
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(270.5290) Quantum optics : Photon statistics

ToC Category:
Research Papers

Original Manuscript: December 2, 2002
Revised Manuscript: December 25, 2002
Published: January 13, 2003

Yun Zhang, Katsuyuki Kasai, and Masayoshi Watanabe, "Experimental investigation of the intensity fluctuation joint probability and conditional distributions of the twin-beam quantum state," Opt. Express 11, 14-19 (2003)

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