Wednesday, June 6, 2012

1206.0944 (Alessandro Ridolfo et al.)

Photon Blockade in the Ultrastrong Coupling Regime    [PDF]

Alessandro Ridolfo, Martin Leib, Salvatore Savasta, Michael J. Hartmann
We explore photon coincidence counting statistics in the ultrastrong-coupling regime where the atom-cavity coupling rate becomes comparable the cavity resonance frequency. In this regime usual normal order correlation functions fail to describe the output photon statistics. By expressing the electric-field operator in the cavity-emitter dressed basis we are able to propose correlation functions that are valid for arbitrary degrees of light-matter interaction. Our results show that the standard photon blockade scenario does not persist for ultrastrong coupling. Instead we observe parametric processes even for two-level emitters and temporal oscillations of intensity correlation functions at a frequency given by the ultrastrong photon emitter coupling. These effects can be traced back to the presence of two-photon cascade decays induced by counter-rotating interaction terms.
View original: http://arxiv.org/abs/1206.0944

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