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【Jiho Park】
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Quantum Optics
Second-order interference of true thermal light from a warm atomic ensemble in two independent unbalanced interferometers
Editors' Pick
Download:696次
Jiho Park
Heonoh Kim
Han Seb Moon
*
Author Affiliations
Abstract
Department of Physics, Pusan National University, Geumjeong-Gu, Busan 46241, Republic 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 J. Phys.
18
,
032002
(
2016
)
NJOPFM
1367-2630
10.1088/1367-2630/18/3/032002
]. 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
Rb
87
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.
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Photonics Research
2021, 9(1): 01000049
Quantum Optics
Hong–Ou–Mandel interference of two independent continuous-wave coherent photons
Download:672次
Heonoh Kim
1†
Danbi Kim
1†
Jiho Park
Han Seb Moon
*
Author Affiliations
Abstract
Department of Physics, Pusan National University, Geumjeong-Gu, Busan 46241, South 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 distribution. Here, 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 reference. To prepare indistinguishable photons from two independent laser sources, we employ high-precision frequency-stabilization techniques using the
5
S
1
/
2
(
F
=
3
)
?
5
P
1
/
2
(
F
′
=
3
)
transition line of
Rb
85
atoms. We successfully observe an HOM interference fringe with two independent continuous-wave coherent photons originating from either the frequency-locked or the frequency-modulated lasers. An 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 photons. We carry out further experiments to verify the robustness of the source preparation regardless of the separation distance between the two independent photon sources.
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Photonics Research
2020, 8(9): 09001491
Quantum Optics
Two-photon interference between continuous-wave coherent photons temporally separated by a day
Download:576次
Danbi Kim
Jiho Park
Taek Jeong
Heonoh Kim
Han Seb Moon
*
Author Affiliations
Abstract
Department of Physics, Pusan National University, Geumjeong-Gu, Busan 46241, South 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 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.
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Photonics Research
2020, 8(3): 03000338
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