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APS

Lilienfeld Prize Talk: Cavity QED - from Purcell and Casimir to the Era of Strong Coupling for Single Atoms and Photons

Harry J. Kimble

Published May 1, 2004• 0 citations
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We report the fabrication of a 1.2 cm long cavity directly on a nanofiber using femtosecond laser ablation. The cavity modes with finesse values in the range of 200-400 can enable the "strong-coupling" regime of cavity QED, with high cooperativity of 10-20, for a single atom trapped 200 nm away from the fiber surface [Phys. Rev. A80, 053826 (2009)PLRAAN1050-294710.1103/PhysRevA.80.053826]. Such cavity modes can still maintain the transmission between 40%-60%, suggesting a one-pass intracavity transmission of 99.53%. Other cavity modes, which can enable cooperativity in the range of 3-10, show transmission over 60%-85% and are suitable for fiber-based single-photon sources and quantum nonlinear optics in the "Purcell" regime.

arXiv:1701.06719•Optics Letters•Feb 24, 2017•38 citations
In this talk, the authors report realization of high-speed single photon generation on demand in a quantum composite of a single85Rb atom and a Fabry-Perot cavity mode. The key idea in our experiment is to optimize system parameters for high efficiency and repetition rate of single photon generation. For this, we employed cavity parameters for a moderate coupling regime instead of the strong coupling regime with the atom-cavity coupling, cavity decay rate and atom decay rate given as (g, K, γ)/2π = (7, 19, 3) MHz (all half widths), respectively. As a result, we could generate single photons with a high efficiency of 17% at a fast repetition rate up to 10 MHz. A figure of merit, defined as the product of the efficiency and the repetition rate, is 30 times higher than those of any previous experiments in the cavity-QED system.
We report the fabrication of a 1.2 cm long cavity directly on a nanofiber using femtosecond laser ablation. The cavity modes with finesse values in the range of 200-400 can enable the "strong-coupling" regime of cavity QED, with high cooperativity of 10-20, for a single atom trapped 200 nm away from the fiber surface [Phys. Rev. A80, 053826 (2009)PLRAAN1050-294710.1103/PhysRevA.80.053826]. Such cavity modes can still maintain the transmission between 40%-60%, suggesting a one-pass intracavity transmission of 99.53%. Other cavity modes, which can enable cooperativity in the range of 3-10, show transmission over 60%-85% and are suitable for fiber-based single-photon sources and quantum nonlinear optics in the "Purcell" regime.