Narrow-Band Biphoton Generation and Quantum Waveform Manipulation with Cold Atoms

Shengwang Du

Shengwang Du

Luwei Zhao, Xianxin Guo, Chang Liu +3 more

Shengwang Du

J. F. Chen, Shanchao Zhang, Hui Yan +3 more

We experimentally demonstrate a technique for shaping the temporal quantum waveform of narrow-band biphotons generated in a cold atomic ensemble via four-wave mixing by periodically modulating the two input classical lasers. We show that it is possible to generate nonclassical paired photons with a predesigned shape of the correlation function.

Luwei Zhao, Xianxin Guo, Yuan Sun +3 more

We demonstrate a technique for shaping the temporal wave function of biphotons generated from spatially modulated spontaneous four-wave mixing in cold atoms. We show that the spatial profile of the pump field can be mapped onto the biphoton temporal wave function in the group delay regime. The spatial profile of the pump laser beam is shaped by using a spatial light modulator. This spatial-to-temporal mapping enables the generation of narrow-band biphotons with controllable temporal waveforms.