D. G. Norris, A. D. Cimmarusti, L. A. Orozco, P. Barberis-Blostein, H. J. Carmichael
An anomalous light shift in the precession of a ground-state Zeeman coherence
is observed: the Larmor frequency increases with the strength of a drive that
is blue (red) detuned from a transition out of the lower (upper) energy level.
Our measurements are made on Rb 85 atoms traversing an optical cavity
containing a few photons; shifts as large as 1% per photon are recorded. The
anomalous shift arises from an accumulation of phase driven by quantum jumps.
It is stochastic and accompanied by broadening.
View original:
http://arxiv.org/abs/1202.3159
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