Stroboscopic backaction evasion in a dense alkali-metal vapor

G. Vasilakis, V. Shah, M. V. Romalis

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We explore experimentally quantum nondemolition measurements of atomic spin in a hot potassium vapor in the presence of spin-exchange relaxation. We demonstrate a new technique for backaction evasion by stroboscopic modulation of the probe light. With this technique we study spin noise as a function of polarization for atoms with spin greater than 1/2 and obtain good agreement with a simple theoretical model. We point that, in a system with fast spin exchange, where the spin-relaxation rate is changing with time, it is possible to improve the long-term sensitivity of atomic magnetometry by using quantum nondemolition measurements.

Original languageEnglish (US)
Article number143601
JournalPhysical review letters
Issue number14
StatePublished - Apr 5 2011

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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