The strong coupling of photons and matter1 in semiconductor nanocavities has been a test bed for cavity quantum electrodynamics2,3 (QED). Vacuum Rabi oscillation4,5,6,7,8—the coherent exchange of a single quantum between a single quantum dot (SQD) and an optical cavity—and highly efficient cavity-QED lasers9,10,11,12,13,14,15,16,17,18,19 have both been reported. The coexistence of vacuum Rabi oscillation and laser oscillation seems to be contradictory, but it has recently been predicted theoretically that the strong-coupling effect could be sustained in laser oscillation20. Here, we demonstrate the onset of lasing in the strong-coupling regime in an SQD–cavity system. A high-quality semiconductor optical nanocavity and strong SQD–field coupling enabled the onset of lasing while maintaining the fragile coherent exchange of quanta.
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We thank S. Ishida, M. Shirane, S. Ohkouchi, Y. Igarashi, A. Tandaechanurat, K. Watanabe, T. Nakaoka, S. Kako and K. Aoki for their technical support and fruitful discussions. This research was supported by the Special Coordination Funds for Promoting Science and Technology and by KAKENHI 20760030, the Ministry of Education, Culture, Sports, Science and Technology, Japan.
The authors declare no competing financial interests.
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Nomura, M., Kumagai, N., Iwamoto, S. et al. Laser oscillation in a strongly coupled single-quantum-dot–nanocavity system. Nature Phys 6, 279–283 (2010). https://doi.org/10.1038/nphys1518
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