title: Shot-noise-limited magnetometer with sub-picotesla sensitivity at room temperature.
abstract: We report a photon shot-noise-limited (SNL) optical magnetometer based on amplitude modulated optical rotation using a room-temperature (85)Rb vapor in a cell with anti-relaxation coating. The instrument achieves a room-temperature sensitivity of 70 fT / √Hz at 7.6 μT. Experimental scaling of noise with optical power, in agreement with theoretical predictions, confirms the SNL behaviour from 5 μT to 75 μT. The combination of best-in-class sensitivity and SNL operation makes the system a promising candidate for application of squeezed light to a state-of-the-art atomic sensor.
authors.affiliation: ICFO - Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
authors.forename: Vito Giovanni
authors.initials: VG
authors.lastname: Lucivero
authors.affiliation: Center for Magneto-Optical Research Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland.
authors.forename: Pawel
authors.initials: P
authors.lastname: Anielski
authors.affiliation: Center for Magneto-Optical Research Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Gawlik
authors.affiliation: ICFO - Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
authors.forename: Morgan W
authors.initials: MW
authors.lastname: Mitchell
mesh_terms: D060306:Magnetometry / Q000295:instrumentation* / Q000379:methods*; D012413:Rubidium / Q000737:chemistry*
chemical_list: D012413:Rubidium