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arXiv quant-ph/9903048quant-ph
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两个时间可区分脉冲的量子干涉

Quantum interference by two temporally distinguishable pulses

Yoon-Ho Kim, Maria V. Chekhova, Sergei P. Kulik, Yanhua Shih, Timothy E. Keller, Morton H. Rubin

摘要:

我们报道了一种双光子干涉效应,其中纠缠光子对是由两个时间上分离的激光脉冲产生的。在单抽运脉冲情况下,实验方案中没有出现干涉效应。然而,通过引入在时间上延迟的第二泵浦脉冲,然后观察到量子干涉。干涉条纹的可见度依赖于两个激光脉冲之间的延迟时间。用时间上分离的两个激光脉冲产生的双光子振幅的不可逆性解释了这一结果。

英文摘要:

We report a two-photon interference effect, in which the entangled photon pairs are generated from two laser pulses well-separated in time. In a single pump pulse case, interference effects did not occur in our experimental scheme. However, by introducing a second pump pulse delayed in time, quantum interference was then observed. The visibility of the interference fringes shows dependence on the delay time between two laser pulses. The results are explained in terms of indistinguishability of biphoton amplitudes which originated from two temporally separated laser pulses.

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