We report the Hong–Ou–Mandel（HOM） interference, with visibility of 91%, produced from two independent single photons retrieved from collective atomic excitations in two separate cold-atom clouds with high optical ...We report the Hong–Ou–Mandel（HOM） interference, with visibility of 91%, produced from two independent single photons retrieved from collective atomic excitations in two separate cold-atom clouds with high optical depths of 90. The high visibility of the HOM dip is ascribed to the pure single photon in the Fock state that was generated from a dense-cold-atom cloud pumping by a short pulse. The visibility is always the same regardless of the time response of the single-photon detectors. This result experimentally shows that the single photons retrieved are in a separable temporal state with their idler photons.展开更多
基金supported by National 973 Program of China(No.2011CB921604)the National Natural Science Foundation of China(NSFC)through the major research plan(Precision Measurement Physics Grant No.91436211)+1 种基金the NSFC Key Research Program(No.11234003)the Young Scientists Research Program(No.11204086)
文摘We report the Hong–Ou–Mandel（HOM） interference, with visibility of 91%, produced from two independent single photons retrieved from collective atomic excitations in two separate cold-atom clouds with high optical depths of 90. The high visibility of the HOM dip is ascribed to the pure single photon in the Fock state that was generated from a dense-cold-atom cloud pumping by a short pulse. The visibility is always the same regardless of the time response of the single-photon detectors. This result experimentally shows that the single photons retrieved are in a separable temporal state with their idler photons.
