Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 52, Issue 23, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6455/ab4a61
Keywords
electron electric dipole moment; beyond the standard model; shot-noise limit; spin precession measurement; excess noise suppression; fast polarization switching
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Funding
- NSF
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Experimental searches for the electron electric dipole moment, de, probe new physics beyond the Standard Model. Recently, the ACME Collaboration set a new limit of vertical bar d(e)vertical bar < 1.1 x 10(-29) e . cm.(ACME Collaboration 2018 Nature 562 355-60), constraining time reversal symmetry (T) violating physics in the 3-100 TeV energy scale. ACME extracts d(e) from the measurement of electron spin precession due to the thorium monoxide (ThO) molecule's internal electric field. This recent ACME II measurement achieved an order of magnitude increased sensitivity over ACME I by reducing both statistical and systematic uncertainties in the measurement of the electric dipole precession frequency. The ACME II statistical uncertainty was a factor of 1.7 above the ideal shot-noise limit. We have since traced this excess noise to timing imperfections. When the experimental imperfections are eliminated, we show that shot noise limit is attained by acquiring noise-free data in the same configuration as ACME II.
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