Signatures of cooperative emission in photon coincidence: Superradiance versus measurement-induced cooperativity

Moritz Cygorek, Eleanor D. Scerri, Ted S. Santana, Zhe X. Koong, Brian D. Gerardot, and Erik M. Gauger
Phys. Rev. A 107, 023718 – Published 17 February 2023

Abstract

Indistinguishable quantum emitters confined to length scales smaller than the wavelength of the light become superradiant. Compared to uncorrelated and distinguishable emitters, superradiance results in qualitative modifications of optical signals such as photon coincidences. However, recent experiments revealed that similar signatures can also be obtained in situations where emitters are too far separated to be superradiant if correlations between emitters are induced by the wave-function collapse during an emission-angle-selective photon detection event. Here, we compare two sources for cooperative emission, superradiance and measurement-induced cooperativity, and analyze their impact on time-dependent optical signals. We find that an antidip in photon coincidences at zero time delay is a signature of interemitter correlations in general but does not unambiguously prove the presence of superradiance. This suggests that photon coincidences at zero time delay alone are not sufficient and time-dependent data are necessary to clearly demonstrate a superradiant enhancement of the spontaneous radiative decay rate.

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  • Received 15 August 2022
  • Accepted 2 February 2023

DOI:https://doi.org/10.1103/PhysRevA.107.023718

©2023 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Moritz Cygorek1, Eleanor D. Scerri1, Ted S. Santana2, Zhe X. Koong1, Brian D. Gerardot1, and Erik M. Gauger1

  • 1SUPA, Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, Scotland, United Kingdom
  • 2National Physical Laboratory, Hampton Road, Teddington TW11 0LW, England, United Kingdom

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Issue

Vol. 107, Iss. 2 — February 2023

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