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We report on an experimental observation of a two-photon ghost interferenceexperiment. A distinguishing feature of our experiment is that the photons aregenerated via a non-degenerated spontaneous four-wave mixing process in a hotatomic ensemble; therefore the photon has narrow bandwidth. Besides, there is alarge difference in frequency between two photons in a pair. Our works may beimportant to achieve more secure, large transmission capacity long-distancequantum communication.

Two-color ghost interference with photon pairs generated in hot atoms