Cavity quantum electrodynamics, a central research field in optics and solid-state physics1,2,3, addresses properties of atom-like emitters in cavities and can be divided into a weak and a strong coupling regime. For weak coupling, the spontaneous emission can be enhanced or reduced compared with its vacuum level by tuning discrete cavity modes in and out of resonance with the emitter2,4,5,6,7,8,9,10,11,12,13. However, the most striking change of emission properties occurs when the conditions for strong coupling are fulfilled. In this case there is a change from the usual irreversible spontaneous emission to a reversible exchange of energy between the emitter and the cavity mode. This coherent coupling may provide a basis for future applications in quantum information processing or schemes for coherent control. Until now, strong coupling of individual two-level systems has been observed only for atoms in large cavities14,15,16,17. Here we report the observation of strong coupling of a single two-level solid-state system with a photon, as realized by a single quantum dot in a semiconductor microcavity. The strong coupling is manifest in photoluminescence data that display anti-crossings between the quantum dot exciton and cavity-mode dispersion relations, characterized by a vacuum Rabi splitting of about 140 µeV.
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Yamamoto, Y. & Slusher, R. E. Optical processes in microcavities. Physics Today 46, 66–73 (1993)
Gerard, J. M. & Gayral, B. InAs quantum dots: artificial atoms for solid-state cavity-quantum electrodynamics. Physica E 9, 131–139 (2001)
Vahala, K. J. Optical microcavities. Nature 424, 839–846 (2003)
Kleppner, D. Inhibited spontaneous emission. Phys. Rev. Lett. 47, 233–236 (1981)
Goy, P., Raimond, J. M., Cross, M. M. & Haroche, S. Observation of cavity-enhanced single-atom spontaneous emission. Phys. Rev. Lett. 50, 1903–1906 (1983)
Gabrielse, G. & Dehmelt, H. Observation of inhibited spontaneous emission. Phys. Rev. Lett. 55, 67–70 (1985)
Hulet, R. G., Hilfer, E. S. & Kleppner, D. Inhibited spontaneous emission by a Rydberg atom. Phys. Rev. Lett. 55, 2137–2140 (1985)
Gerard, J. M. et al. Enhanced spontaneous emission by quantum boxes in a monolithic optical microcavity. Phys. Rev. Lett. 81, 1110–1113 (1998)
Bayer, M. et al. Inhibition and enhancement of the spontaneous emission of quantum dots in structured microresonators. Phys. Rev. Lett. 86, 3168–3171 (2001)
Solomon, G. S., Pelton, M. & Yamamoto, Y. Single-mode spontaneous emission from a single quantum dot in a three-dimensional microcavity. Phys. Rev. Lett. 86, 3903–3906 (2001)
Pelton, M. et al. Efficient source of single photons: a single quantum dot in a micropost microcavity. Phys. Rev. Lett. 89, 233602-1-4 (2002)
Santori, C., Fattal, D., Vuckovic, J., Solomon, G. S. & Yamamoto, Y. Indistinguishable photons from a single-photon device. Nature 419, 594–597 (2002)
Michler, P. et al. A quantum dot single-photon turnstile device. Science 290, 2282–2285 (2000)
Hood, C. J., Chapman, M. S., Lynn, T. W. & Kimble, H. J. Real-time cavity QED with single atoms. Phys. Rev. Lett. 80, 4157–4160 (1998)
Mabuchi, H. & Doherety, A. C. Cavity quantum electrodynamics: coherence in context. Science 298, 1372–1377 (2002)
McKeever, J. et al. Experimental realization of one-atom laser in the regime of strong coupling. Nature 425, 268–271 (2003)
McKeever, J. et al. State-insensitive cooling and trapping of single atoms in an optical cavity. Phys. Rev. Lett. 90, 133602-1-4 (2003)
Monroe, C. Quantum information processing with atoms and photons. Nature 416, 238–246 (2002)
Imamoglu, A. et al. Quantum information processing using quantum dot spins and cavity QED. Phys. Rev. Lett. 83, 4204–4207 (1999)
Stievater, T. H. et al. Rabi oscillations of excitons in single quantum dots. Phys. Rev. Lett. 87, 133603-1-4 (2001)
Li, X. Q. & Yan, Y. J. Quantum computation with coupled quantum dots in optical microcavities. Phys. Rev. B 65, 205301-1-5 (2002)
Kiraz, A., Atatüre, M. & Imamoglu, A. Quantum-dot single-photon sources: Prospects for applications in linear optics quantum-information processing. Phys. Rev. A. 69, 032305 (2004)
Andreani, L., Panzarini, G. & Gerard, J. M. Strong-coupling regime for quantum boxes in pillar microcavities: Theory. Phys. Rev. B 60, 13276–13279 (1999)
Rudin, S. & Reinecke, T. L. Oscillator model for vacuum Rabi splitting in microcavities. Phys. Rev. B 59, 10227–10233 (1999)
Purcell, E. M. Spontaneous emission probabilities at radio frequencies. Phys. Rev. 69, 681 (1946)
Bayer, M. & Forchel, A. Temperature dependence of the exciton homogeneous linewidths in In0.6Ga0.4As/GaAs self-assembled quantum dots. Phys. Rev. B 65, 041308-1-4 (R) (2002)
Guest, J. R. et al. Measurement of optical absorption by a single quantum dot exciton. Phys. Rev. B 65, 241310-1-4 (2002)
Shimizu, Y. et al. Control of light pulse propagation with only a few cold atoms in a high finesse microcavity. Phys. Rev. Lett. 89, 233001-1-4 (2002)
Partial financial support of this work by the DARPA QuIST program, the Deutsche Forschungsgemeinschaft via Research Group Quantum Optics in Semiconductor Nanostructures, the Office of Naval Research and the ONR Nanoscale Electronics Program, INTAS and the State of Bavaria is acknowledged.
The authors declare that they have no competing financial interests.
Contains supporting details of the sample technology as well as a discussion of the dot linewidth, the control of the in-plane dot position, single dot identification and the number of photons in a cavity at a given time. (DOC 26 kb)
Schematic layer layout of the two-dimensional optical cavity. (PDF 18 kb)
Temperature dependence of PL spectra for a 1.5 mm microcavity showing the tuning of a single QD exciton through resonance with the cavity mode in the weak coupling regime. (PDF 59 kb)
Legends to Supplementary Figures 1 and 2. (DOC 20 kb)
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Reithmaier, J., Sęk, G., Löffler, A. et al. Strong coupling in a single quantum dot–semiconductor microcavity system. Nature 432, 197–200 (2004). https://doi.org/10.1038/nature02969
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