4.2 Article

Photon correlation transients in a weakly blockaded Rydberg ensemble

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IOP PUBLISHING LTD
DOI: 10.1088/1361-6455/ab728f

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Rydberg blockade; collective response; single photon

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  1. EPSRC [1771120] Funding Source: UKRI

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The nonlinear and non-local effects in atomic Rydberg media under electromagnetically induced transparency (EIT) make it a versatile platform for fundamental studies and applications in quantum information. In this paper, we study the dynamics of a Rydberg-EIT system in an ensemble that allows for more than one Rydberg excitation in the propagation direction. The density of two-level atoms is such that transient superradiant effects occur. We experimentally observe a cross-over between coherent collective emission ('flash') of two-level atoms to a Rydberg dressed regime ('dressed flash') under EIT condition. The complex dynamics are characterised using both intensity and time correlation measurements. We show that while steady-state EIT gives a second order correlation g((2)) = 0.79 0.04, the Rydberg-dressed flash exhibits anti-bunching down to 0.2 0.04.

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