Speedup of adiabatic multiqubit state-transfer by ultrastrong coupling of matter and radiation

TL;DR

This paper demonstrates that ultrastrong coupling in circuit QED can significantly accelerate adiabatic multiqubit state transfer, potentially enhancing quantum processing speed while maintaining error resilience.

Contribution

It introduces a method to speed up adiabatic quantum state transfer using ultrastrong matter-radiation coupling in circuit QED architectures, addressing error sources.

Findings

Ultrastrong coupling enables substantial speedup of adiabatic protocols.

The approach is resilient to dynamical Casimir effect and cavity losses.

Potential to approach fault-tolerant quantum processing speeds.

Abstract

Ultrastrongly coupled quantum hardware may increase the speed of quantum state processing in distributed architectures, allowing to approach fault-tolerant threshold. We show that circuit QED architectures in the ultrastrong coupling regime, which has been recently demonstrated with superconductors, may show substantial speedup for a class of adiabatic protocols resilient to the main source of errors, namely the interplay of dynamical Casimir effect and cavity losses.