Collective Suppression of Linewidths in Circuit QED

TL;DR

This paper demonstrates experimentally and theoretically how collective effects in circuit QED can suppress linewidths of multiple qubits, potentially enhancing coherence times by modifying dephasing and dissipation.

Contribution

It provides the first experimental observation and a theoretical explanation of collective linewidth suppression in multi-qubit circuit QED systems.

Findings

Linewidths are suppressed collectively in multi-qubit circuit QED.

Strong qubit-cavity coupling alters dephasing and dissipation processes.

Potential for improved coherence times in many-body quantum systems.

Abstract

We report the experimental observation, and a theoretical explanation, of collective suppression of linewidths for multiple superconducting qubits coupled to a good cavity. This demonstrates how strong qubit-cavity coupling can significantly modify the dephasing and dissipation processes that might be expected for individual qubits, and can potentially improve coherence times in many-body circuit QED.