Quantum interference by two temporally distinguishable pulses
Yoon-Ho Kim, Maria V. Chekhova, S. P. Kulik, Yanhua H. Shih · Physical Review A · 1999
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 a dependence on the delay time between two laser pulses. The results are explained in terms of indistinguishability of biphoton amplitudes that originates from two temporally separated laser pulses.