Ultrafast single-photon detection at high repetition rates based on optical Kerr gates under focusing

Abstract

The ultrafast detection of single photons is currently restricted by the limited time resolution (a few picoseconds) of the available single-photon detectors. Optical gates offer a faster time resolution, but so far they have been applied mostly to ensembles of emitters. Here, we demonstrate through a semi-analytical model that the ultrafast time-resolved detection of single quantum emitters can be possible using an optical Kerr shutter at gigahertz rates under focused illumination. This technique provides sub-picosecond time resolution, while keeping a gate efficiency at around 85%. These findings lay the ground for future experimental investigations on the ultrafast dynamics of single quantum emitters, with implications for quantum nanophotonics and molecular physics.

Split-step birefringence simulation method for optical Kerr gates

“…Theoretical research plays an important role in the optimization of an ultrafast optical Kerr gate. For example, Fattah et al 10 proposed a semi-analytical model for an optical Kerr shutter at a GHz frequency under focused illumination, laying the foundation for the experimental study of ultrafast dynamics of a single quantum emitter in the future. Tan et al 11 calculated the optimal power ratio and time delay of the two switch pulses in a dual-switched Kerr gate based on theoretical calculations.…”