Remnants of semiclassical bistability in the few-photon regime of cavity QED

Details Remnants of semiclassical bistability in the few-photon regime of cavity QED Remnants of semiclassical bistability in the few-photon regime of cavity QED

2010-12-22

arxiv.org/abs/1012.4873v2

Optics Express Vol. 19, Iss. 24, pp. 24468--24482 (2011)

Physics

Optics

14 pages, 7 figures

Scientific paper

10.1364/OE.19.024468

Broadband homodyne detection of the light transmitted by a Fabry-Perot cavity containing a strongly-coupled $^{133}$Cs atom is used to probe the dynamic optical response in a regime where semiclassical theory predicts bistability but strong quantum corrections should apply. While quantum fluctuations destabilize true equilibrium bistability, our observations confirm the existence of metastable states with finite lifetimes and a hysteretic response is apparent when the optical drive is modulated on comparable timescales. Our experiment elucidates remnant semiclassical behavior in the attojoule ($\sim10$ photon) regime of single-atom cavity QED, of potential significance for ultra-low power photonic signal processing.

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