Interference of temporally shaped single photons

We observe the single-photon interference by a single-photon source generated from a spontaneous four-wave mixing process in a cold Rb-85 atomic ensemble. By adjusting the coupling and pump power, we obtain two distinguished temporal modes for single photons. Through an unbalance Mach-Zehnder interferometer, these temporally shaped single photons interfere with themselves and produce constructive or destructive interference according to the phase in the single-photon wave packet. The interferometric results of these temporally shaped single photons match well with the theoretical simulation.