Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Influence of decorrelation on phase sensitivity in a Mach-Zehnder interferometer

매개하향변환 과정에서 발생하는 두광자의 상관관계가 Mach-Zehnder 간섭계의 분해능에 미치는 영향

  • 김헌오 (울산대학교 수학 및 물리기술학부) ;
  • 고정훈 (울산대학교 수학 및 물리기술학부) ;
  • 박구동 (울산대학교 수학 및 물리기술학부) ;
  • 김태수 (울산대학교 수학 및 물리기술학부)
  • Published : 2001.08.01
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Abstract

The influences of decorrelation on phase sensitivity are studied with a computer simulation based on the Bayesian theorem, when correlated photons produced by parametric down-conversion are incident on a Mach-Zehnder interferometer. Although the down-converted photons show a perfect correlation in the production process, this degree of correlation may be decreased by reflection, absorption, and scattering during propagation. It is found that this decorrelation results in phase sensitivity degradation, and that the sensitivity is related to the detector quantum efficiency. The results show that when the phase difference between the two paths is smaller the phase sensitivity is better. etter.

Mach-Zehnder 간섭계에 매개하향변환과정에서 발생한 광자쌍을 입사시켰을 때 두광자의 상관관계가 간섭계의 분해능에 미치는 영향을 Bayes 정리에 근거한 전산 시늉으로 분석하였다. 발생과정에서 두광자는 100%의 상관관계를 가지지만 진행중에 반사, 흡수, 산란 등에 의해 소멸되므로 상관관계가 감소하고, 이러한 상관관계의 감소는 간섭계의 위상분해에 있어서 저하를 가져오는 주요 요인이되며, 또한 간섭계의 분해능은 검출기의 양자효율에 관련됨을 확인하였다. 전산시늉으로 얻은결과, 간섭계의 위상치가 적을수록 위상정밀도는 좋아지고 위상차가 증가할수록 위상의 불확정도는 점점 증가하는 경향을 나타내었다.

Keywords

References

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