Photon statistics as an interference phenomenon

Beitrag in einer Fachzeitschrift

Details zur Publikation

Autor(en): Mehringer T, Mährlein S, von Zanthier J, Agarwal G
Zeitschrift: Optics Letters
Jahr der Veröffentlichung: 2018
Band: 43
Heftnummer: 10
Seitenbereich: 2304-2307
ISSN: 0146-9592


Interference of light fields, first postulated by Young, is one of the fundamental pillars of physics. Dirac extended this observation to the quantum world by stating that each photon interferes only with itself. A precondition for interference to occur is that no welcher-weg information labels the paths the photon takes; otherwise, the interference vanishes. This remains true, even if two-photon interference is considered, e.g., in the Hong-Ou-Mandel-experiment. Here, the two photons interfere only if they are indistinguishable, e.g., in frequency, momentum, polarization, and time. Less known is the fact that two-photon interference and photon indistinguishability also determine the photon statistics in the overlapping light fields of two independent sources. As a consequence, measuring the photon statistics in the far field of two independent sources reveals the degree of indistinguishability of the emitted photons. In this Letter, we prove this statement in theory using a quantum mechanical treatment. We also demonstrate the outcome experimentally with a simple setup consisting of two statistically independent thermal light sources with adjustable polarizations. We find that the photon statistics vary indeed as a function of the polarization settings, the latter determining the degree of welcher-weg information of the photons emanating from the two sources. (C) 2018 Optical Society of America.

FAU-Autoren / FAU-Herausgeber

Agarwal, Girish Prof.
Professur für Experimentalphysik
Mährlein, Simon
Professur für Experimentalphysik
Mehringer, Thomas
Professur für Experimentalphysik
von Zanthier, Joachim Prof. Dr.
Professur für Experimentalphysik


Mehringer, T., Mährlein, S., von Zanthier, J., & Agarwal, G. (2018). Photon statistics as an interference phenomenon. Optics Letters, 43(10), 2304-2307.

Mehringer, Thomas, et al. "Photon statistics as an interference phenomenon." Optics Letters 43.10 (2018): 2304-2307.


Zuletzt aktualisiert 2018-10-08 um 23:01