A precision measurement of the electron's electric dipole moment using trapped molecular ions

Abstract

We describe the first precision measurement of the electron's electric dipole moment (eEDM, $d_e$) using trapped molecular ions, demonstrating the application of spin interrogation times over 700 ms to achieve high sensitivity and stringent rejection of systematic errors. Through electron spin resonance spectroscopy on ${}^{180}{\mathrm{Hf}}^{19}{\mathrm{F}}^{+}$ in its metastable ${}^3{\Delta }_1$ electronic state, we obtain $d_e=(0.9\pm 7.7_{\mathrm{stat}}\pm 1.7_{\mathrm{syst}})\times 10^{-29}e\mathrm{cm}$, resulting in an upper bound of $|d_e|<1.3\times 10^{-28}e\mathrm{cm}$ (90% confidence). Our result provides independent confirmation of the current upper bound of $|d_e|<9.3\times 10^{-29}e\mathrm{cm}$ [J. Baron $\text{et al.}$, Science $\text{343}$, 269 (2014)], and offers the potential to improve on this limit in the near future.

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