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Acta Sinica Quantum Optica

The Generation and the Measurement of High Power Twin Beams

Jiangrui Gao

Published Jan 1, 2006• 0 citations
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Abstract

This paper discusses a measurement scheme of high power twin beams generated by a non-degenerated optical parametric oscillator operating above threshold.The beam splitter can be used in the measurement scheme for high power twin beams without disturbing quantum correlation.An experimental demonstration is also given in this paper.

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arXiv:quant-ph/0512093•Optics Letters•Mar 29, 2006•84 citations
The signal and idler beams from a non-degenerate, above threshold, optical parametric oscillator have a strong quantum correlation, which are called twin beams. This correlation arises from the simultaneous generation of the signal and idler photons in the form of twin pairs of photons through the parametric down conversion, and the generated twin beams have exactly the same photon statistics. As a result, the fluctuations on the difference between the intensities of the twin beams are reduced with respect to the shot noise limit, that is, intensity-difference squeezing. We give a comprehensive overview of the generation of twin beams using the optical parametric oscillator, and the applications exploiting the quantum correlation of twin beams are presented.
The quantum entanglement of amplitude and phase quadratures between two intense optical beams with a total intensity of 22 mW and a frequency difference of 1 nm, which are produced from an optical parametric oscillator operating above threshold, is experimentally demonstrated with two sets of unbalanced Mach-Zehnder interferometers. The measured quantum correlations of intensity and phase are in reasonable agreement with the results calculated based on a semiclassical analysis of the noise characteristics given by Fabre et al. [J. Phys. (France) 50, 1209 (1989)].