Cygorek, M; Scerri, E D; Santana, T S; Koong, Z X; Gerardot, B D; Ganger, E M (2023) Signatures of cooperative emission in photon coincidence: superradiance versus measurement-induced cooperativity. Physical Review A, 107. 023718

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Abstract

It is well known that indistinguishable quantum emitters confined to length scales smaller than the wavelength of the light become superradiant resulting in qualitative modifications of optical signals such as photon coincidences compared to uncorrelated and distinguishable emitters. 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 analyze the connection between cooperative emission by selective measurement and superradiance as well as their impact on optical signals. We find that an anti-dip in 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 suficient and time-dependent data is necessary to clearly demonstrate a superradiant enhancement of the spontaneous radiative decay rate.

Item Type:	Article
Subjects:	Optical Radiation and Photonics > Few Photon Science
Divisions:	Quantum Technologies
Identification number/DOI:	10.1103/PhysRevA.107.023718
Last Modified:	18 Oct 2023 14:13
URI:	https://eprintspublications.npl.co.uk/id/eprint/9847