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Q: Fachverband Quantenoptik und Photonik

Q 16: Quantum Optics

Q 16.4: Poster

Donnerstag, 23. September 2021, 16:30–18:30, P

Collective emission of nitrogen-vacancy centers in nanodiamond agglomerates — •Ashkan Zand, Jonas Gutsche, Marek Bültel, and Artur Widera — Technische Universität Kaiserslautern und Landesforschungszentrum OPTIMAS, 67663 Kaiserslautern, Germany

Individual quantum emitters form a fundamental building block in emerging quantum technology. Collective effects, such as superradiance in ensembles of emitters, might improve the performance of such applications even further. In the transition to larger scales, however, correlations of collective systems might be covered in the environmental background.

We will present the experimental observation of Dicke-superradiance of nitrogen-vacancy (NV) centers in highly-doped nanodiamond agglomerates. Fluorescence-lifetime measurements show results consistent with increased collective effects in larger agglomerates. By contrast, the second-order correlation function fails to quantify collective effects for the case of an ensemble of collectively contributing domains to the emission. Therefore, a new figure of merit to trace and quantify collective emission based on the fluctuation statistics of the emitted light is introduced. Analyzing the quantity, we reveal increased collective effects of large diamond agglomerates.

While the experimental data originates from NV centers in diamond, the theoretical model presented here applies to a variety of other emitters such as other color centers or quantum dots, shedding light on collective effects in scalable quantum systems.