1.5 μm 통신파장대역 진동수 얽힘 광자쌍의 양자간섭
Quantum Interference Experiments with Frequency Entangled Photon Pairs at 1.5 μm Telecommunication Band
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초록
펨토초 펄스형 자발적 매개하향변환에서 생성된 1.5 μm 통신파장대역 광자쌍의 진동수 얽힘상태를 구현하고, 광섬유 기반Hong-Ou-Mandel 간섭계를 이용하여 양자간섭 실험을 수행하였다. 각진동수 ω_1 과 ω_2 에 대응하는 두 광자의 파장은 저밀도 파장분할다중화(coarse wavelength division multiplexing, CWDM) 필터를 이용하여 선택하였고, 간섭계에서 경로차에 따른 두 검출기의 동시계수 측정에서 높은 선명도를 갖는 공간적인 맥놀이 형태의 간섭무늬를 관측하였다.
Abstract
We performed experiments on Hong-Ou-Mandel type two-photon interference with frequency entangled photon pairs at 1.5 μm telecommunication band generated through femtosecond pulsed spontaneous parametric down-conversion. Two different angular frequencies ω_1 and ω_2 were selected using CWDM(coarse wavelength division multiplexing) filters at the output ports of the interferometer. The coincidence counting rates were measured with varying path-length difference between the two interferometer arms to observe the two-photon interference patterns of spatial beating. The obtained visibilities in the net coincidence were close to the theoretical limit of 100%.
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