Dipolar quantum logic for freely-rotating trapped molecular ions

TL;DR

This paper explores using oscillating electric dipole-dipole interactions between co-trapped molecular ions for quantum logic, avoiding static fields and quantum control of motion, thus enhancing scalability.

Contribution

It introduces a method utilizing oscillating dipoles for quantum logic with molecular ions, eliminating the need for static polarizing fields and quantum control of motion.

Findings

Dynamic decoupling from laboratory fields

No need for static polarizing fields

Potential for scalable ion trap quantum computing

Abstract

We consider the practical feasibility of using the direct, electric dipole-dipole interaction between co-trapped molecular ions for robust quantum logic without the need for static polarizing fields. The use of oscillating dipole moments, as opposed to static electric dipoles, dynamically decouples the dipoles from laboratory fields, including the electric fields of the trap itself. Further, this implementation does not require quantum control of motion, potentially removing a major roadblock to ion trap quantum computing scalability. Since the polarizing field is electromagnetic radiation, even pairs of states with splittings in the THz regime can be fully polarized.