Observation of two-photon coalescence in weak coherent wave packets

Arruda, M. F. Z.; Mahdavifar, Moslem; Krop, Thomas; Ribeiro, P. H. Souto; Rafsanjani, Seyed Mohammad Hashemi

doi:10.1364/josab.397209

Cited by 3 publications

(1 citation statement)

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“…Researchers have extensively performed HOM-type TPI experiments with classical light sources such as weak coherent and thermal light beams [23][24][25][26][27][28][29][30][31][32][33][34] . Recently, the measurement of high-visibility HOM fringes with weak coherent photons has played a key role in the practical implementation of measurement-device-independent quantum key distribution protocols [35][36][37][38][39][40] .…”

Section: Introductionmentioning

confidence: 99%

Two-Photon Interferences of Weak Coherent Lights

Kim

Kwon

Moon

2021

Preprint

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Multiphoton interference is an important phenomenon in modern quantum mechanics and experimental quantum optics, and it is fundamental for the development of quantum information science and technologies. Over the last three decades, several theoretical and experimental studies have been performed to understand the essential principles underlying such interference and to explore potential applications. Recently, the two-photon interference (TPI) of phase-randomized weak coherent states has played a key role in the realization of long-distance quantum communication based on the use of classical light sources. In this context, we investigated TPI experiments with weak coherent pulses and quantitatively analyzed the results in terms of the single- and coincidence-counting rates and one- and two-photon interference-fringe shapes. We experimentally examined the Hong-Ou-Mandel-type TPI of phase-randomized weak coherent pulses to compare the TPI effect at the single-photon level with that of correlated photons. Further experiments were also performed with two temporally- and spatially separated weak coherent pulses. Although the observed interference results, including the results of visibility and fringe shape, can be suitably explained by classical intensity correlation, the physics underlying the TPI effect needs to be interpreted as the interference between the two-photon states at the single-photon level within the utilized interferometer. The results of this study can provide a more comprehensive understanding of the TPI of coherent light at the single-photon level.

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Section: Introductionmentioning

confidence: 99%

Two-Photon Interferences of Weak Coherent Lights

Kim

Kwon

Moon

2021

Preprint

View full text Add to dashboard Cite

show abstract

Two-photon interferences of weak coherent lights

Kim

Kwon

Moon

2021

Sci Rep

View full text Add to dashboard Cite

Multiphoton interference is an important phenomenon in modern quantum mechanics and experimental quantum optics, and it is fundamental for the development of quantum information science and technologies. Over the last three decades, several theoretical and experimental studies have been performed to understand the essential principles underlying such interference and to explore potential applications. Recently, the two-photon interference (TPI) of phase-randomized weak coherent states has played a key role in the realization of long-distance quantum communication based on the use of classical light sources. In this context, we investigated TPI experiments with weak coherent pulses at the single-photon level and quantitatively analyzed the results in terms of the single- and coincidence-counting rates and one- and two-photon interference-fringe shapes. We experimentally examined the Hong–Ou–Mandel-type TPI of phase-randomized weak coherent pulses to compare the TPI effect with that of correlated photons. Further experiments were also performed with two temporally- and spatially separated weak coherent pulses. Although the observed interference results, including the results of visibility and fringe shape, can be suitably explained by classical intensity correlation, the physics underlying the TPI effect needs to be interpreted as the interference between the two-photon states at the single-photon level within the utilized interferometer. The results of this study can provide a more comprehensive understanding of the TPI of coherent light at the single-photon level.

show abstract