Continuous Nondemolition Measurement of the Cs Clock Transition Pseudospin

2005/06/30 by Souma Chaudhury, Greg Smith, Greg A. Smith +3 · 3 citations
Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #quant-ph

paper · pdf · doi:10.1103/physrevlett.96.043001

published as Phys. Rev. Lett. 96, 043001 (2006) · 4 pages, 4 figures, ReVTeX, modified text in response to referee's comments

openalex publication_date 2006/01/30 · arxiv created 2006/04/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We demonstrate a weak continuous measurement of the pseudospin 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 component of the collective pseudospin. At certain probe frequencies the differential light shift of the clock states vanishes, and the measurement is nonperturbing. In dense samples the measurement can be used to squeeze the collective clock pseudospin and has the potential to improve the performance of atomic clocks and interferometers.

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