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Second-order interference of true thermal light from a warm atomic ensemble in two independent unbalanced interferometers

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Photonics Research 2021年第1期9卷 49-53页

作者： JIHO PARK heonoh kim HAN SEB MOON Department of Physics Pusan National UniversityGeumjeong-GuBusan 46241Republic of Korea

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 ***.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 *** 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 *** 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 *** 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.

关键词： ensemble thermal atomic

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Hong–Ou–Mandel interference of two independent continuous-wave coherent photons

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Photonics Research 2020年第9期8卷 1491-1495页

作者： heonoh kim DANBI kim JIHO PARK AND HAN SEB MOON Department of Physics Pusan National UniversityGeumjeong-GuBusan 46241South Korea

Interference between two completely independent photons lies at the heart of many photonic quantum information applications such as quantum repeaters,teleportation,and quantum key ***,we report the observation of Hong–Ou–Mandel(HOM)interference with two independent continuous-wave coherent light sources that are neither synchronized nor share any common *** prepare indistinguishable photons from two independent laser sources,we employ high-precision frequency-stabilization techniques using the 5 S1∕2(F=3)-5P1∕2(F'=3)transition line of 85 Rb *** successfully observe an HOM interference fringe with two independent continuous-wave coherent photons originating from either the frequency-locked or the frequency-modulated *** interference fringe involving two-photon beating is also observed when the frequency difference between the two interfering photons is beyond the spectral bandwidth of the individual coherent *** carry out further experiments to verify the robustness of the source preparation regardless of the separation distance between the two independent photon sources.

关键词： coherent photons quantum

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Two-photon interference between continuous-wave coherent photons temporally separated by a day

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Photonics Research 2020年第3期8卷 338-342页

作者： DANBI kim JIHO PARK TAEK JEONG heonoh kim HAN SEB MOON Department of Physics Pusan National UniversityGeumjeong-GuBusan 46241South Korea

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 *** we report on two-photon interference with temporally separated continuous-wave coherent photons by using a temporal post-selection method with an arbitrary time *** 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 ***,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.

关键词： separated coherent photon

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