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Comment on "Optical control of the refractive index of a single atom": it is needed to shout "wake up"

V. A. Kuz’menko

Published Aug 3, 2006• 0 citations
OpenAlex

Abstract

T. Kampschulte, et al., in Phys. Rev. Lett., {\bf 105}, 153603 (2010) observed surprising for them a strong cooling effect in the presence of resonance vertical probe Raman laser beam. However, this cooling effect is a simple and natural consequence of the fundamental property of quantum physics: time reversal noninvariance.

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We experimentally demonstrate the elementary case of electromagnetically induced transparency with a single atom inside an optical cavity probed by a weak field. We observe the modification of the dispersive and absorptive properties of the atom by changing the frequency of a control light field. Moreover, a strong cooling effect has been observed at two-photon resonance, increasing the storage time of our atoms twenty-fold to about 16 seconds. Our result points towards all-optical switching with single photons.
It is theoretically shown that storage and time reversal of light pulses can be achieved in a coupled-resonator optical waveguide by dynamic tuning of the cavity resonances without maintaining the translational invariance of the system. The control exploits the Bloch oscillation motion of a light pulse in the presence of a refractive index ramp, and it is therefore rather different from the mechanism of adiabatic band compression and reversal proposed by Yanik and Fan in recent works [Phys. Rev. Lett., 92, 083901 (2004); 93, 173903 (2004)].