A Continuous Non-demolition Measurement of the Cs Clock Transition Pseudo-spin
arXiv:quant-ph/0506158 · doi:10.1103/PhysRevLett.96.043001
Abstract
We demonstrate a weak continuous measurement of the pseudo-spin associated with the clock transition in a sample of Cs atoms. Our scheme uses an optical probe tuned near the D1 transition to measure the sample birefringence, which depends on the z-component of the collective pseudospin. At certain probe frequencies the differential light shift of the clock states vanishes and the measurement is non-perturbing. In dense samples the measurement can be used to squeeze the collective clock pseudo-spin, and has potential to improve the performance of atomic clocks and interferometers.
4 pages, 4 figures, ReVTeX, modified text in response to referee's comments
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