Cooperative emission from solid-state quantum emitters
Moritz Cygorek
Cooperative emission from solid-state quantum emittersMoritz Cygorek aa 1Open Quantum Systems Group, Technical University of Dortmund, 44227 Dortmund, GermanyMaterials for Sustainable Development Conference (MATSUS)Proceedings of MATSUS Spring 2024 Conference (MATSUS24)#PeroQuant24 - Halide perovskites for quantum technologiesBarcelona, Spain, 2024 March 4th - 8thOrganizers: Simon Boehme, Sascha Feldmann and Maksym KovalenkoInvited Speaker, Moritz Cygorek, presentation 555DOI: https://doi.org/10.29363/nanoge.matsus.2024.555Publication date: 18th December 2023Novel growth and fabrication technologies allow for an unprecedented level of control over nanoscale semiconductor quantum devices. Recently, several groups have demonstrated samples where multiple quantum dots can be tuned into resonance [1,2]. When multiple quantum emitters become indistinguishable, collective quantum effects like superradiance and measurement-induced cooperative emission [2] emerge due to entanglement between the emitters. A detailed understanding of the signatures of cooperative emission is challenging for several reasons: First, close-to-identical emitters operate in a regime where non-degerate perturbation theory breaks down. Second, real-world quantum devices typically strongly interact with local phonon baths as well as with a global photonic environment, and the different environments generally influence each other. Moreover, the presence of ad- ditional imperfections like spectral wandering further obfuscates the physical picture. Nevertheless, for few emitters, the problem of cooperative emission in the presence of multiple environments can be solved numerically exactly using the process tensor (PT) formalism [3,4]. Here, I report on recent theoretical and experimental findings and summarize the current understanding of cooperative emission in semiconductor nanostructures. This in- cludes the discussion of how genuine superradiance can be distinguished from measurement- induced cooperative emission, how to interpret peaks in g(2) photon correlation experi- ments, and why inter-emitter correlations remain strong for long times despite strong interactions with phonons. References:[1] J.-H. Kim, S. Aghaeimeibodi, C. J. K. Richardson, R. P. Leavitt, E. Waks, Nano Lett. 18, 4734 (2018).[2] Z.X. Koong, M. Cygorek, E. Scerri, T. S. Santana, S. I. Park, J. D. Song, E. M. Gauger, B. D. Gerardot, Sci. Adv. 8, abm8171 (2022).[3] M. Cygorek, M. Cosacchi, A. Vagov, V. M. Axt, B. W. Lovett, J. Keeling, E. M. Gauger, Nature Physics 18, 662 (2022).[4] J. Wiercinski, E. M. Gauger, M. Cygorek, Phys. Rev. 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