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Updated: Dec 7, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Spectral-temporal biphoton waveform of photon pairs from cascade-type warm atoms
Jiho Park1, Taek Jeong1, Han Seb Moon2
1Department of Physics, Pusan National University, Geumjeong-Gu, Busan, 46241, South Korea.
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.
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