High bandwidth atomic magnetometery with continuous quantum nondemolition measurements

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

Research output: Contribution to journalArticlepeer-review

122 Scopus citations


We describe an experimental study of spin-projection noise in a high sensitivity alkali-metal magnetometer. We demonstrate a fourfold improvement in the measurement bandwidth of the magnetometer using continuous quantum nondemolition measurements. Operating in the scalar mode with a measurement volume of 2cm3 we achieve magnetic field sensitivity of 22fT/Hz1/2 and a bandwidth of 1.9 kHz with a spin polarization of only 1%. Our experimental arrangement is naturally backaction evading and can be used to realize sub-fT sensitivity with a highly polarized spin-squeezed atomic vapor.

Original languageEnglish (US)
Article number013601
JournalPhysical review letters
Issue number1
StatePublished - Jan 5 2010

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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