Cavity-mediated collective emission from steady-state subradiance

Kyu-Young Kim, Jin Hee Lee, Woong Bae Jeon, Dong Hyun Park, Suk In Park, Jin Dong Song, Changhyoup Lee () and Je-Hyung Kim ()
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Kyu-Young Kim: Ulsan National Institute of Science and Technology
Jin Hee Lee: Ulsan National Institute of Science and Technology
Woong Bae Jeon: Ulsan National Institute of Science and Technology
Dong Hyun Park: Ulsan National Institute of Science and Technology
Suk In Park: Korea Institute of Science and Technology
Jin Dong Song: Korea Institute of Science and Technology
Changhyoup Lee: Korea Research Institute of Standards and Science
Je-Hyung Kim: Ulsan National Institute of Science and Technology

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Cooperative effects such as super(or sub)radiance in quantum systems arise from the interplay among quantum emitters. While bright superradiant states have been extensively studied and have yielded important insights into cooperative phenomena, subradiant states remain less explored due to their inherently dark state nature. However, subradiance holds significant potential as a valuable quantum resource exploiting long-lived and large-scale entanglement, which is a key for advancing quantum information technologies. Here, we demonstrate strong collective emission from a cavity-mediated steady-state subradiant state. In a tailored photonic environment with balanced cavity dissipation, emitter-field coupling strength, and incoherent pumping, two quantum dots coupled to a low-Q cavity exhibit a steady-state population in a subradiant state with a highly negative cooperativity parameter among the emitters. As a key signature of steady-state subradiance, the system shows strong photon bunching ( $${{{\rm{g}}}}^{\left(2\right)}\left(0\right) > 8$$ g 2 0 > 8 ) and suppressed single-photon decay (36 ns). Furthermore, we investigate that such collective interactions can be manipulated by controlling various system parameters, such as detuning and dephasing, supported by numerical simulations. Our approach to inducing cavity-mediated subradiance paves the way for generating and harnessing quantum correlations among quantum emitters via controlled dissipation.

Date: 2025
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DOI: 10.1038/s41467-025-61629-w

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