Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Effects of noise on coincidence detection in an optical system with entangled state photons

얽힘상태 광을 이용한 광학계에서 잡광이 동시계수에 미치는 영향

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

The influences of background and environmental noise on coincidence detection are investigated with entangled photons produced by parametric down-conversion process. When the down-converted photons are mixed with thermal light, the coincidence rate did not vary with increasing noise level because the accidental coincidences are discriminated at the short resolving time window. The entangled photon source and the coincidence technique can effectively be used for a noise-free communication channel in the new field of quantum information transmission and processing. ssing.

두 검출기를 이용하여 매개하향변환과정에서 발생하는 광자쌍을 동시계수할 때 배경 및 잡광이 동시계수에 미치는 영향을 조사하였다. 열광원에서 나온 광자들이 광자쌍과 함께 입사할 때 측정장치 내에서 분해시간에 의해 이러한 잡광을 효과적으로 제거하기 때문에 광자쌍의 동시계수에는 전형 영향을 미치지 않았다. 이러한 얽힘 상태의 광원의 동시계수 측정방법은 신호광의 손실이나 잡광의 영향을 최소화하는 정보처리와 전송 및 통신체계에 효과적으로 이용될 수 있다.

Keywords

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