Continuous nondemolition measurement of the Cs clock transition pseudospin

Souma Chaudhury, Greg A. Smith, Kevin Schulz, Poul S. Jessen

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


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 z 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.

Original languageEnglish (US)
Article number043001
JournalPhysical review letters
Issue number4
StatePublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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