Switchable coupling for superconducting qubits using double resonance in the presence of crosstalk

TL;DR

This paper evaluates the double-resonance method for switchable coupling in superconducting qubits, analyzing feasibility, crosstalk effects, and introducing a new crosstalk-assisted coupling channel as an alternative.

Contribution

It provides a detailed analysis of the double-resonance coupling method and proposes a novel crosstalk-assisted channel for improved qubit coupling.

Findings

Effective coupling strength is limited by crosstalk effects.

Crosstalk can be exploited to create an alternative coupling channel.

The proposed crosstalk-assisted channel offers a promising alternative.

Abstract

Several methods have been proposed recently to achieve switchable coupling between superconducting qubits. We discuss some of the main considerations regarding the feasibility of implementing one of those proposals: the double-resonance method. We analyze mainly issues related to the achievable effective coupling strength and the effects of crosstalk on this coupling approach. We also find a new, crosstalk-assisted coupling channel that can be an attractive alternative when implementing the double-resonance coupling proposal.