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Optical Measurements of Weak Absorption Beyond Shot-Noise Limit

In: Quantum Communication, Computing, and Measurement

Author

Listed:
  • Wang Hai

    (Shanxi University, Institute of Opto-Electronics)

  • Xie Changde

    (Shanxi University, Institute of Opto-Electronics)

  • Pan Qing

    (Shanxi University, Institute of Opto-Electronics)

  • Xue Chenyang

    (Shanxi University, Institute of Opto-Electronics)

  • Zhang Yun

    (Shanxi University, Institute of Opto-Electronics)

  • Peng Kunchi

    (Shanxi University, Institute of Opto-Electronics)

Abstract

The optical measurement of weak absorption beyond the shot-noise limit (SNL) has been achieved by employing quantum-correlated twin beams from a nondegenerate optical parametric oscillator operating above threshold. An improvement in signal-to-noise ratio of 2.5dB relative to SNL is obtained for the weak absorption measurements. Semiclassical theoretical analyses demonstrate that the minimum detectable absorptance is able to trend toward zero through the proposed regime if the intensity difference squeezing between the twin beams is perfect.

Suggested Citation

  • Wang Hai & Xie Changde & Pan Qing & Xue Chenyang & Zhang Yun & Peng Kunchi, 1997. "Optical Measurements of Weak Absorption Beyond Shot-Noise Limit," Springer Books, in: O. Hirota & A. S. Holevo & C. M. Caves (ed.), Quantum Communication, Computing, and Measurement, pages 445-453, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4615-5923-8_48
    DOI: 10.1007/978-1-4615-5923-8_48
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