Oral/9. Quantum Optics and Quantum Information Technology

Tsinghua University;Tsinghua University;Tsinghua University;Tsinghua University

Recently, we propose a temporal ghost imaging scheme based on frequency correlation, which is a stable degree of freedom when photons propagate over fibers. We demonstrate its feasibility with both quantum light source and thermal light source. The quantum temporal ghost imaging is based on a telecom-band quantum light source, which generates frequency-correlated photon pairs. It is realized by spontaneous four-wave mixing in a piece of silicon waveguide under continuous-wave pumping. The quantum state of the photon pairs has a broad spectrum, hence, the two photons in a pair has broadband frequency correlation. The signal and idler photons are separated by a filter system, which are centered at 1510 nm and 1550 nm, respectively, with a bandwidth of 16 nm at both sides. The temporal GI scheme is based on frequency correlation of two beams, which can also be realized by thermal light sources. In the experiment, the thermal light source is realized by SFWM in the silicon waveguide, since both signal and idler photons generated by spontaneous four-wave mixing are under thermal statistics. The pump light of the source is generated by a mode-lock fiber laser with a repetitive rate of 40 MHz. Two optical filters are used to control the linewidth of the pulsed pump light and select the signal photons, by which the linewidth of the selected signal photons is 3 nm and they are under single-mode thermal state.