Spectroscopy using dipole-phonon quantum logic

@misc{qi2026spectroscopy,
  title = {{Spectroscopy using dipole-phonon quantum logic}},
  author = {Lu Qi and Evan C. Reed and Duanyang Wang and Boyan Yu and Kenneth R. Brown},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.07680},
  eprint = {2610.07680},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.07680},
}

TY  - UNPB
TI  - Spectroscopy using dipole-phonon quantum logic
AU  - Lu Qi
AU  - Evan C. Reed
AU  - Duanyang Wang
AU  - Boyan Yu
AU  - Kenneth R. Brown
PY  - 2026
DA  - 2026/10/06
PB  - arXiv
DO  - 10.48550/arxiv.2610.07680
UR  - https://arxiv.org/abs/2610.07680
AB  - 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 Ω-doublet of CaO^+. By comparing the dipole-phonon signal across three trap-frequency ramp ranges, we determine the splitting to be ω_mol=2π×454±1 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.
ER  -