Roamlis, Budker paper added

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@@ -4465,3 +4465,15 @@ journal = {Science}
 	abstract = {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.}
 	pages = {053601}
 }
+
+@article{romalis2007natphys,
+	author = {{Budker}, D. and {Romalis}, M.},
+	title = "{Optical magnetometry}",
+	journal = {Nature Physics},
+	year = 2007,
+	month = apr,
+	volume = 3,
+	pages = {227-234},
+	doi = {10.1038/nphys566},
+	abstract = {Some of the most sensitive methods of measuring magnetic fields use interactions of resonant light with atomic vapour. Recent developments in this vibrant field have led to improvements in sensitivity and other characteristics of atomic magnetometers, benefiting their traditional applications for measurements of geomagnetic anomalies and magnetic fields in space, and opening many new areas previously accessible only to magnetometers based on superconducting quantum interference devices. We review basic principles of modern optical magnetometers, discuss fundamental limitations on their performance, and describe recently explored applications for dynamical measurements of biomagnetic fields, detecting signals in NMR and MRI, inertial rotation sensing, magnetic microscopy with cold atoms, and tests of fundamental symmetries of nature. }
+}