Phys. Rev. Lett. 98, 200801 (2007) [4 pages]High-Resolution Magnetometry with a Spinor Bose-Einstein CondensateReceived 15 December 2006; published 17 May 2007 We demonstrate a precise magnetic microscope based on direct imaging of the Larmor precession of a 87Rb spinor Bose-Einstein condensate. This magnetometer attains a field sensitivity of 8.3 pT/Hz1/2 over a measurement area of 120 μm2, an improvement over the low-frequency field sensitivity of modern SQUID magnetometers. The achieved phase sensitivity is close to the atom shot-noise limit, estimated as 0.15 pT/Hz1/2 for a unity duty cycle measurement, suggesting the possibilities of spatially resolved spin-squeezed magnetometry. This magnetometer marks a significant application of degenerate atomic gases to metrology. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.200801
DOI:
10.1103/PhysRevLett.98.200801
PACS:
07.55.Ge, 03.75.Mn
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