We report the demonstration of a second-order interference experiment by use of thermal light emitted from a warm atomic ensemble in two spatially separated unbalanced Michelson interferometers(UMIs).This novel multip...We report the demonstration of a second-order interference experiment by use of thermal light emitted from a warm atomic ensemble in two spatially separated unbalanced Michelson interferometers(UMIs).This novel multipath correlation interference with thermal light has been theoretically proposed by Tamma[New J.Phys.18,032002(2016)].In our experiment,the bright thermal light used for second-order interference is superradiantly emitted via collective two-photon coherence in Doppler-broadened cascade-type 87 Rb atoms.Owing to the long coherence time of the thermal light from the atomic ensemble,we observe its second-order interference in the two independent UMIs by means of time-resolved coincidence detection.The temporal waveforms of the interfering thermal light in the two spatially separated UMIs exhibit similarities with the temporal two-photon waveform of time–energy entangled photon pairs in Franson interferometry.Our results can contribute toward a better understanding of the relation between first-and second-order interferences that are at the heart of photonics-based quantum information science.展开更多
An understanding of the phenomenon of light interference forms the kernel underlying the discovery of the nature of light from the viewpoints of both classical physics and quantum physics.Here we report on two-photon ...An understanding of the phenomenon of light interference forms the kernel underlying the discovery of the nature of light from the viewpoints of both classical physics and quantum physics.Here we report on two-photon interference with temporally separated continuous-wave coherent photons by using a temporal post-selection method with an arbitrary time delay.Although the temporal separation of a day between the photons is considerably longer than the coherence time of the light source,we observe the Hong–Ou–Mandel(HOM)interference of the pairwise two-photon state.Furthermore,we experimentally demonstrate the HOM interference observed in one of the interferometer-output modes by using only one single-photon detector for a large temporal separation.展开更多
基金National Research Foundation of Korea(2018R1A2A1A19019181,2020M3E4A1080030)Institute for Information and Communications Technology Promotion(IITP-2020-0-01606)。
文摘We report the demonstration of a second-order interference experiment by use of thermal light emitted from a warm atomic ensemble in two spatially separated unbalanced Michelson interferometers(UMIs).This novel multipath correlation interference with thermal light has been theoretically proposed by Tamma[New J.Phys.18,032002(2016)].In our experiment,the bright thermal light used for second-order interference is superradiantly emitted via collective two-photon coherence in Doppler-broadened cascade-type 87 Rb atoms.Owing to the long coherence time of the thermal light from the atomic ensemble,we observe its second-order interference in the two independent UMIs by means of time-resolved coincidence detection.The temporal waveforms of the interfering thermal light in the two spatially separated UMIs exhibit similarities with the temporal two-photon waveform of time–energy entangled photon pairs in Franson interferometry.Our results can contribute toward a better understanding of the relation between first-and second-order interferences that are at the heart of photonics-based quantum information science.
基金National Research Foundation of Korea(2018R1A2A1A19019181)。
文摘An understanding of the phenomenon of light interference forms the kernel underlying the discovery of the nature of light from the viewpoints of both classical physics and quantum physics.Here we report on two-photon interference with temporally separated continuous-wave coherent photons by using a temporal post-selection method with an arbitrary time delay.Although the temporal separation of a day between the photons is considerably longer than the coherence time of the light source,we observe the Hong–Ou–Mandel(HOM)interference of the pairwise two-photon state.Furthermore,we experimentally demonstrate the HOM interference observed in one of the interferometer-output modes by using only one single-photon detector for a large temporal separation.
