Schemes for robust quantum computation with polar molecules: analysis of experimental feasibility

TL;DR

This paper evaluates the feasibility of implementing quantum computers with polar molecules, focusing on interaction schemes, molecular choices, and decoherence sources to optimize quantum gate performance.

Contribution

It provides a detailed analysis of switchable dipole-dipole interactions for quantum gates and assesses experimental requirements for various molecular systems.

Findings

Switchable dipole-dipole interactions enable efficient two-qubit gates.

Specific molecular states and transitions suitable for quantum gates are identified.

Decoherence sources are analyzed to improve quantum computation fidelity.

Abstract

We analyse recently proposed physical implementations of a quantum computer based on polar molecules. A set of general requirements for a molecular system is presented, which would provide an optimal combination of quantum gate times, coherence times, number of operations, high gate accuracy and experimental feasibility. We proceed with a detailed analysis of a scheme utilizing switchable dipole-dipole interactions between polar molecules. Switchable dipole-dipole interaction is an efficient tool for realization of two-qubit quantum gates, necessary to construct a universal set of gates. We consider three possible realizations of a phase gate using specific molecules, such as CO, NF, alkali dimers and alkaline-earth monohalides. We suggest suitable electronic states and ransitions and investigate requirements for the pulses driving them. Finally, we analyse possible sources of decoherence.