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High Bandwidth Atomic Magnetometery with Continuous Quantum Non-demolition Measurements

Authors
  • Shah, V.
  • Vasilakis, G.
  • Romalis, M. V.
Type
Published Article
Publication Date
Jan 18, 2010
Submission Date
Jul 13, 2009
Identifiers
DOI: 10.1103/PhysRevLett.104.013601
Source
arXiv
License
Yellow
External links

Abstract

We describe an experimental study of spin-projection noise in a high sensitivity alkali-metal magnetometer. We demonstrate a four-fold improvement in the measurement bandwidth of the magnetometer using continuous quantum non-demolition (QND) measurements. Operating in the scalar mode with a measurement volume of 2 cm^3 we achieve magnetic field sensitivity of 22 fT/Hz^(1/2) and a bandwidth of 1.9 kHz with a spin polarization of only 1%. Our experimental arrangement is naturally back-action evading and can be used to realize sub-fT sensitivity with a highly polarized spin-squeezed atomic vapor.

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