Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Fourth-order interference between perpendicularly polarized beams with different intensities in a HOM interferometer

HOM 간섭계에서 세기가 다른 수직편광된 빔사이의 4차 간섭

  • Kim, Heon-Oh (School of Mathematics and Applied Physics, University of Ulsan) ;
  • Kim, Tae-Soo (School of Mathematics and Applied Physics, University of Ulsan) ;
  • Ko, Jeon-Hoon (Laboratory for Quantum Optics, Korea Atomic Energy Research Institute)
  • 김헌오 (울산대학교 수학 및 물리기술학부) ;
  • 김태수 (울산대학교 수학 및 물리기술학부) ;
  • 고정훈 (한국원자력연구소 양자광학기술개발팀)
  • Published : 2003.04.01
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Abstract

We have observed a nonclassical effect in a fourth-order interference experiment with the photon pairs produced by parametric down-conversion and the Hong-Ou-Handel interferometer. For interfering classical fields with orthogonal polarizations, the visibility can be no larger than 50%, and it depends on the ratio of the two beam intensities. It is found that not only is our observed visibility of 85％ well above 50％, but it is also independent of the two beam intensities in coincidence measurements made in a two-photon polarization correlation experiment.

매개하향변환과정에서 발생한 광자쌍과 Hong-Ou-Mandel 간섭계를 이용한 4차 간섭실험에서 비고전적인 간섭효과를 관측하였다. 편광방향이 서로 수직인 두 광의 4차 간섭에서 간섭무늬의 선명도가 고전적인 한계인 50%를 넘는 최대 85%의 간섭무늬를 관측하였다. 또한 두 빔의 세기 비율이 증가할수록 간섭무늬의 선명도가 감소하는 고전적인 간섭현상과 달리 두 광의 세기 비율이 1:10인 경우에도 83%의 선명도를 갖는 간섭효과를 측정하였다.

Keywords

References

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