Inhomogeneous light shift effects on atomic quantum state evolution in non-destructive measurements

Patrick Joachim Windpassinger, Daniel Oblak, Ulrich Busk Hoff, Jürgen Appel, Niels Kjærgaard, Eugene S. Polzik

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Various parameters of a trapped collection of cold and ultracold atoms can be determined non-destructively by measuring the phase shift of an off-resonant probe beam, caused by the state-dependent index of refraction of the atoms. The dispersive light–atom interaction, however, gives rise to a differential light shift (ac Stark shift) between the atomic states which, for a non-uniform probe intensity distribution, causes an inhomogeneous dephasing between the atoms. In this paper, we investigate the effects of this inhomogeneous light shift in non-destructive measurement schemes in cold caesium. We interpret our experimental data on dispersively probed Rabi oscillations and Ramsey fringes in terms of a simple light shift model which is shown to describe the observed behavior well. Furthermore, we show that by using spin echo techniques, the inhomogeneous phase shift distribution between the two clock levels can be reversed.
Original languageEnglish
Article number053032
JournalNew Journal of Physics
Volume10
Number of pages15
ISSN1367-2630
DOIs
Publication statusPublished - 2008
Externally publishedYes

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