Dr. Alejandra Collopy Profile

Dr. Alejandra Collopy

at NIST

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Proceedings Article | 5 March 2021 Presentation

Quantum logic control and spectroscopy of a single molecular ion

Alejandra Collopy, David Leibrandt, Dietrich Leibfried, Chin-Wen Chou

Proceedings Volume 11700, 117001F (2021) https://doi.org/10.1117/12.2586882

KEYWORDS: Ions, Spectroscopy, Molecular spectroscopy, Logic, Raman spectroscopy, Molecules, Calcium

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Quantum logic enables state preparation, readout and spectroscopy of otherwise difficult-to-study ions. Using the coupled harmonic motion shared between co-trapped ions, information can be transferred from the "spectroscopy" ion to the easily manipulated "logic" ion. With this technique we perform high-resolution terahertz-scale rotational spectroscopy of a single CaH+ molecular ion in pure states by leveraging a Ca+ ion as our logic ion. Entangled states between a CaH+ and a Ca+ have also been demonstrated, making molecular ions possible components of hybrid systems for quantum information processing. Because all our laser operations on the molecule are driving stimulated Raman transitions with high detuning, the technique promises to be generalizable to a wide variety of molecular ion species. Additionally, we study the systematic effects of the trap RF electric field on molecular levels and use it to obtain a measurement of the dipole moment of the charged molecule.

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