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Acta Sinica Quantum Optica

Quantum Correlation of Twin Beams in Time Domain

Jiangrui Gao

Published Jan 1, 2009• 0 citations
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Abstract

This paper discusses a time-domain measurement scheme of quantum correlation of twin beams generated by a non-degenerated optical parametric oscillator operating above threshold.By using data-acquire technique we analyzed quantum correlation of twin beams in timedomain.An experimental demonstration about the change of quantum correlation of twin beams along with the time is given in this paper.

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arXiv:0709.4520•Journal of Physics B Atomic Molecular and Optical Physics•Jan 22, 2008•8 citations
This paper discusses a time-domain measurement scheme of quantum correlation of twin beams generated by a non-degenerated optical parametric oscillator operating above threshold.By using data-acquire technique we analyzed quantum correlation of twin beams in timedomain.An experimental demonstration about the change of quantum correlation of twin beams along with the time is given in this paper.
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.
Quantum entanglement and intensity correlations in continuous variable (CV) regimes have investigated in the time domain in addition to many analogous investigations performed in the frequency domain. The specific signatures of time-resolved CV quadrature entanglement and intensity difference squeezing have been analyzed for periodically-pulsed optical parametric oscillator (OPO). An application to quantum key distribution scheme based on intensity correlation of twin beams has also been considered.
The dependence of quantum correlations of twin beams on the pump finesse of an optical parametric oscillator is studied via a semi-classical analysis. It is found that the phase-sum correlation of the output signal and idler beams from an optical parametric oscillator operating above threshold depends on the finesse of the pump field when the spurious pump phase noise generated inside the optical cavity and the excess noise of the input pump field are involved in the Langevin equations. The theoretical calculations can explain the previously experimental results quantitatively.