Spectroscopy using dipole-phonon quantum logic

Abstract:Dipole-phonon quantum logic (DPQL) offers novel approaches for state preparation, measurement, and control of quantum information in molecular ion qubits. Here we report the first experimental demonstration of DPQL as a spectroscopic tool using the shared motional mode of a CaO$^+$-Ca$^+$ ion chain to measure the frequency splitting of the ground $\Omega$-doublet of CaO$^+$. By comparing the dipole-phonon signal across three trap-frequency ramp ranges, we determine the splitting to be $\omega_{mol}=2\pi\times454\pm1$ kHz and place a lower bound on the effective dipole-phonon coupling. The rate of observation is limited by the low thermal population in the molecular ground rotational state.

arXiv:2610.07680 [quant-ph]

(or arXiv:2610.07680v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.07680 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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