Squeezed-light optical magnetometry.
We demonstrate a light-shot-noise-limited magnetometer based on the Faraday effect in a hot unpolarized ensemble of rubidium atoms. By using off-resonant, polarization-squeezed probe light, we improve the sensitivity of the magnetometer by 3.2 dB. The technique could improve the sensitivity of the most advanced magnetometers and quantum nondemolition measurements of atomic spin ensembles.
Wolfgramm
Florian
F
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
Cerè
Alessandro
A
Beduini
Federica A
FA
Predojević
Ana
A
Koschorreck
Marco
M
Mitchell
Morgan W
MW
D008280:Magnetics / Q000295:instrumentation* / Q000379:methods; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D055095:Optics and Photonics; D017785:Photons; D012413:Rubidium / Q000737:chemistry*
D012413:Rubidium