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Shot-noise-limited spin measurements in a pulsed molecular beam
Authors
WC Campbell
D Demille
+10 more
JM Doyle
G Gabrielse
YV Gurevich
PW Hess
NR Hutzler
E Kirilov
BR O'Leary
E Petrik
B Spaun
AC Vutha
Publication date
26 July 2013
Publisher
eScholarship, University of California
Abstract
Heavy diatomic molecules have been identified as good candidates for use in electron electric dipole moment (eEDM) searches. Suitable molecular species can be produced in pulsed beams, but with a total flux and/or temporal evolution that varies significantly from pulse to pulse. These variations can degrade the experimental sensitivity to changes in the spin precession phase of an electrically polarized state, which is the observable of interest for an eEDM measurement. We present two methods for measurement of the phase that provide immunity to beam temporal variations, and make it possible to reach shot-noise-limited sensitivity. Each method employs rapid projection of the spin state onto both components of an orthonormal basis. We demonstrate both methods using the eEDM-sensitive H3Δ1 state of thorium monoxide, and use one of them to measure the magnetic moment of this state with increased accuracy relative to previous determinations. © 2013 American Physical Society
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Last time updated on 25/12/2021