Spectral\u2013temporal biphoton waveform of photon pairs from cascade-type warm atoms

Jiho Park,Taek Jeong,Han Seb Moon

doi:10.1038/s41598-020-73610-2

Abstract

We investigate the spectral–temporal biphoton waveforms of the photon pairs emitted from cascade-type two-photon-coherent warm 87Rb atoms via the spontaneous four-wave mixing process in the 5S1/2–5P3/2–5D5/2 transition, under the condition of the different detuning frequencies (symmetric detuning conditions of ± 1 GHz) of the pump and coupling lasers relative to the 5P3/2 state. In both detuning cases corresponding to ± 1 GHz, the biphoton temporal waveforms and biphoton spectral waveforms of the photon pairs are measured by means of time-resolved coincidence photon counting and stimulated measurements, respectively. Although photon-pairs were generated using opposite detunings, we confirm that the spectral–temporal biphoton waveforms of the photon pairs are very similar. Furthermore, we observe Hong–Ou–Mandel interference with 82% visibility with the two independent heralded single photons.

Highlights

We investigate the spectral–temporal biphoton waveforms of the photon pairs emitted from cascadetype two-photon-coherent warm 87Rb atoms via the spontaneous four-wave mixing process in the 5S1/2–5P3/2–5D5/2 transition, under the condition of the different detuning frequencies of the pump and coupling lasers relative to the 5P3/2 state
The biphoton temporal waveform (BTW) and biphoton spectral waveform (BSW) of the photon pairs are measured by time-resolved coincidence photon counting and stimulated measurements, respectively
We experimentally investigated the dependence of photon pairs from the 5S1/2 − 5P3/2 − 5D5/2 transition of 87Rb atoms on the detuning frequencies δ of the pump and coupling lasers relative to the 5P3/2 state

Summary

Introduction

We investigate the spectral–temporal biphoton waveforms of the photon pairs emitted from cascadetype two-photon-coherent warm 87Rb atoms via the spontaneous four-wave mixing process in the 5S1/2–5P3/2–5D5/2 transition, under the condition of the different detuning frequencies (symmetric detuning conditions of ± 1 GHz) of the pump and coupling lasers relative to the 5P3/2 state. We investigate the spectral–temporal biphoton waveforms of photon pairs generated in the 5S1/2–5P3/2–5D5/2 transition of 87Rb atoms for two cases: the detuning frequencies of + 1 GHz and − 1 GHz from the one-photon transitions of the pump laser under the cascade-type two-photon resonant condition.

Results

Conclusion