Optical Measurements of Weak Absorption Beyond Shot-Noise Limit

Wang Hai, Xie Changde, Pan Qing, Xue Chenyang, Zhang Yun and Peng Kunchi ()
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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

A chapter in Quantum Communication, Computing, and Measurement, 1997, pp 445-453 from Springer

Abstract: 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.

Keywords: Intensity Difference; Shot Noise; Weak Absorption; Optical Parametric Oscillator; Minimum Detectable Absorption (search for similar items in EconPapers)
Date: 1997
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DOI: 10.1007/978-1-4615-5923-8_48

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