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Q: Fachverband Quantenoptik und Photonik

Q 10: Cavity QED

Q 10.4: Vortrag

Montag, 11. März 2024, 18:00–18:15, HS 1199

Cavity-mediated collective emission from few emitters in a diamond membrane — •Kerim Köster¹, Maximilian Pallmann¹, Yuan Zhang², Julia Heupel³, Timon Eichhorn¹, Cyril Popov³, Klaus Mølmer⁴, and David Hunger¹ — ¹Karlsruhe Institute of Technology, Germany — ²Zhengzhou University, China — ³University of Kassel, Germany — ⁴University of Copenhagen, Denmark

When an ensemble of quantum emitters couples to a common radiation field, their polarizations can synchronize and a collective emission termed superfluorescence can occur. Entering this regime in a free-space setting requires a large number of emitters with a high spatial density as well as coherent optical transitions with small inhomogeneity. Here we show that by coupling nitrogen-vacancy (NV) centers in a diamond membrane to a high-finesse microcavity, also few, incoherent, inhomogeneous, and spatially separated emitters - as are typical for solid state systems - can enter the regime of collective emission. We observe a super-linear power dependence of the emission rate as a hallmark of collective emission. Furthermore, we find simultaneous photon bunching and antibunching on different timescales in the second-order auto-correlation function, revealing cavity-induced interference in the quantized emission from about fifteen emitters. We develop theoretical models and find that the population of collective states together with cavity enhancement and filtering can explain the observations. Such a system has prospects for the generation of multi-photon quantum states, and for the preparation of entanglement in few-emitter systems. Related publication: arXiv:2311.12723v1

Keywords: Superfluorescence; NV centers; Microcavity; Purcell effect; Collective emission