Dipole-phonon quantum logic with alkaline-earth monoxide and monosulfide cations

TL;DR

This paper explores the use of alkaline-earth monoxide and monosulfide cations for dipole-phonon quantum logic, demonstrating their potential for scalable quantum information processing with theoretical analysis and experimental considerations.

Contribution

It introduces a new class of molecular ions suitable for DPQL and advances the theoretical framework for their use in quantum computing.

Findings

Calculations of DPQL operations for CaO$^+$ molecular ions.

Discussion of progress towards experimental realization.

Development of theory including state preparation, measurement, and entanglement.

Abstract

Dipole-phonon quantum logic (DPQL) leverages the interaction between polar molecular ions and the motional modes of a trapped-ion Coulomb crystal to provide a potentially scalable route to quantum information science. Here, we study a class of candidate molecular ions for DPQL, the cationic alkaline-earth monoxides and monosulfides, which possess suitable structure for DPQL and can be produced in existing atomic ion experiments with little additional complexity. We present calculations of DPQL operations for one of these molecules, CaO$^+$, and discuss progress towards experimental realization. We also further develop the theory of DPQL to include state preparation and measurement and entanglement of multiple molecular ions.