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Kirilov, E

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Kirilov

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Kirilov, E

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2011 - 20162

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Author's Publications: search.filters.isAuthorOfPublication.d4171e13-e296-4715-a5ce-0fae85c3cb97

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    Stimulated Raman Adiabatic Passage Preparation of a Coherent Superposition of ThO H3Δ1 States for an Improved Electron Electric-Dipole-Moment Measurement
    (American Physical Society (APS), 2016) Panda, Cristian; O, B. R.; West, A. D.; Baron, J.; Hess, P; Hoffman, C.; Kirilov, E; Overstreet, C. B.; West, Elizabeth Petrik; DeMille, D.; Doyle, John; Gabrielse, Gerald
    Experimental searches for the electron electric-dipole moment (EDM) probe new physics beyond the standard model. The current best EDM limit was set by the ACME Collaboration [Science 343, 269 (2014), 10.1126/science.1248213], constraining time-reversal symmetry (T ) violating physics at the TeV energy scale. ACME used optical pumping to prepare a coherent superposition of ThO H3Δ1 states that have aligned electron spins. Spin precession due to the molecule's internal electric field was measured to extract the EDM. We report here on an improved method for preparing this spin-aligned state of the electron by using stimulated Raman adiabatic passage (STIRAP). We demonstrate a transfer efficiency of 75 %±5 % , representing a significant gain in signal for a next-generation EDM experiment. We discuss the particularities of implementing STIRAP in systems such as ours, where molecular ensembles with large phase-space distributions are transferred via weak molecular transitions with limited laser power and limited optical access.
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    Magnetic and Electric Dipole Moments of the \(H\ ^3\Delta_1\) State in ThO
    (American Physical Society, 2011) Vutha, Amar; Spaun, Ben; Gurevich, Yulia Vsevolodovna; Hutzler, Nicholas; Kirilov, E; Doyle, John; Gabrielse, Gerald; DeMille, David
    The metastable \(H\ ^3\Delta_1\) state in the thorium monoxide (ThO) molecule is highly sensitive to the presence of a CP-violating permanent electric dipole moment of the electron (eEDM). The magnetic dipole moment \(\mu_H\) and the molecule-fixed electric dipole moment \(D_H\) of this state are measured in preparation for a search for the eEDM. The small magnetic moment \(\mu_H = 8.5(5) \times 10^{-3}\ \mu_B\) displays the predicted cancellation of spin and orbital contributions in a \(^3\Delta_1\) paramagnetic molecular state, providing a significant advantage for the suppression of magnetic field noise and related systematic effects in the eEDM search. In addition, the induced electric dipole moment is shown to be fully saturated in very modest electric fields (\(<\) 10 V/cm). This feature is favorable for the suppression of many other potential systematic errors in the ThO eEDM search experiment.