arXiv:2303.06402

Novel spin-precession method for sensitive EDM searches

A. Boeschoten, Marshall, V. R., T. B. Meijknecht, Anno Touwen, Hendrick L. Bethlem, Anastasia Borschevsky, Steven Hoekstra, Joost W. F. van Hofslot, Klaus Peter Jungmann, Maarten C. Mooij, Rob G. E. Timmermans, Wim Ubachs, Lorenz Willmann

Published Mar 11, 2023• 2 citations

arXiv HTML PDF

Abstract

We demonstrate a spin-precession method to observe and analyze multi-level coherence between all hyperfine levels in the $X ^2Σ^+,N=0$ ground state of barium monofluoride ($^{138}$Ba$^{19}$F). The signal is sensitive to the state-preparation Rabi frequency and external electric and magnetic fields applied in searches for a permanent electric dipole moment (EDM). In the obtained interference spectrum, the electric field and Rabi frequency become observable simultaneously with the EDM. This method reduces systematic biases and the number of auxiliary measurements for such precision measurements.

DOI: 10.48550/arxiv.2303.06402

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arXiv:2303.06402

Novel spin-precession method for sensitive EDM searches

Published Mar 11, 2023• 2 citations

arXiv HTML PDF

Abstract

We demonstrate a spin-precession method to observe and analyze multi-level coherence between all hyperfine levels in the

X ^2Σ^+,N=0

ground state of barium monofluoride (

^{138}

^{19}

F). The signal is sensitive to the state-preparation Rabi frequency and external electric and magnetic fields applied in searches for a permanent electric dipole moment (EDM). In the obtained interference spectrum, the electric field and Rabi frequency become observable simultaneously with the EDM. This method reduces systematic biases and the number of auxiliary measurements for such precision measurements.

DOI: 10.48550/arxiv.2303.06402

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Measurement of the Electric Dipole Moment of Yb171 Atoms in an Optical Dipole Trap

T. A. Zheng, Yutong Yang, S.-Z. Wang +4 more

The permanent electric dipole moment (EDM) of the $^{171}\mathrm{Yb}$ $(I=1/2)$ atom is measured with atoms held in an optical dipole trap. By enabling a cycling transition that is simultaneously spin-selective and spin-preserving, a quantum nondemolition measurement with a spin-detection efficiency of 50% is realized. A systematic effect due to parity mixing induced by a static $E$ field is observed, and is suppressed by averaging between measurements with optical dipole traps in opposite directions. The coherent spin precession time is found to be much longer than 300 s. The EDM is determined to be $d(^{171}\mathrm{Yb})=\phantom{\rule{0ex}{0ex}}(\ensuremath{-}6.8\ifmmode\pm\else\textpm\fi{}{5.1}_{\text{stat}}\ifmmode\pm\else\textpm\fi{}{1.2}_{\mathrm{syst}})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}27}\text{ }\text{ }e\text{ }\mathrm{cm}$, leading to an upper limit of $|d(^{171}\mathrm{Yb})|<1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}26}\text{ }\text{ }e\text{ }\mathrm{cm}$ (95% C.L.). These measurement techniques can be adapted to search for the EDM of $^{225}\mathrm{Ra}$ .The permanent electric dipole moment (EDM) of the $^{171}\mathrm{Yb}$ $(I=1/2)$ atom is measured with atoms held in an optical dipole trap. By enabling a cycling transition that is simultaneously spin-selective and spin-preserving, a quantum nondemolition measurement with a spin-detection efficiency of 50% is realized. A systematic effect due to parity mixing induced by a static $E$ field is observed, and is suppressed by averaging between measurements with optical dipole traps in opposite directions. The coherent spin precession time is found to be much longer than 300 s. The EDM is determined to be $d(^{171}\mathrm{Yb})=\phantom{\rule{0ex}{0ex}}(\ensuremath{-}6.8\ifmmode\pm\else\textpm\fi{}{5.1}_{\text{stat}}\ifmmode\pm\else\textpm\fi{}{1.2}_{\mathrm{syst}})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}27}\text{ }\text{ }e\text{ }\mathrm{cm}$, leading to an upper limit of $|d(^{171}\mathrm{Yb})|<1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}26}\text{ }\text{ }e\text{ }\mathrm{cm}$ (95% C.L.). These measurement techniques can be adapted to search for the EDM of $^{225}\mathrm{Ra}$.

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Cheng Tang, Teng Zhang, David S. Weiss

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arXiv:1802.07892Physical Review AMar 8, 20185 citations

We demonstrate a spin-precession method to observe and analyze multi-level coherence between all hyperfine levels in the

X ^2Σ^+,N=0

ground state of barium monofluoride (

^{138}

^{19}

The permanent electric dipole moment (EDM) of the

^{171}\mathrm{Yb}

(I=1/2)

atom is measured with atoms held in an optical dipole trap. By enabling a cycling transition that is simultaneously spin-selective and spin-preserving, a quantum nondemolition measurement with a spin-detection efficiency of 50% is realized. A systematic effect due to parity mixing induced by a static

E

field is observed, and is suppressed by averaging between measurements with optical dipole traps in opposite directions. The coherent spin precession time is found to be much longer than 300 s. The EDM is determined to be $d(^{171}\mathrm{Yb})=\phantom{\rule{0ex}{0ex}}(\ensuremath{-}6.8\ifmmode\pm\else\textpm\fi{}{5.1}_{\text{stat}}\ifmmode\pm\else\textpm\fi{}{1.2}_{\mathrm{syst}})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}27}\text{ }\text{ }e\text{ }\mathrm{cm}$, leading to an upper limit of $|d(^{171}\mathrm{Yb})|<1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}26}\text{ }\text{ }e\text{ }\mathrm{cm}$ (95% C.L.). These measurement techniques can be adapted to search for the EDM of

^{225}\mathrm{Ra}

First Measurement of the Atomic Electric Dipole Moment of

^{225}

The radioactive radium-225 (

^{225}

Ra) atom is a favorable case to search for a permanent electric dipole moment (EDM). Due to its strong nuclear octupole deformation and large atomic mass,

^{225}

Ra is particularly sensitive to interactions in the nuclear medium that violate both time-reversal symmetry and parity. We have developed a cold-atom technique to study the spin precession of

^{225}

Ra atoms held in an optical dipole trap, and demonstrated the principle of this method by completing the first measurement of its atomic EDM, reaching an upper limit of

|

d

(

^{225}

Ra)

|

m=0

magnetic sublevel, the shot-noise-limited uncertainty of these measurements is

1/\sqrt{2F(F+1)}

smaller than that of a Larmor precession measurement. When the populations in the even (or odd) magnetic sublevels are combined, we show that these measurements are independent of the tensor Stark shift and the second order Zeeman shift. We discuss the complicating effect of a transverse magnetic field and show that when the ratio of the tensor Stark shift to the transverse magnetic field is sufficiently large, an EDM measurement with atoms initialized in the superposition of the stretched states can reach the optimal sensitivity.