High speed quantum gates with cavity quantum electrodynamics

TL;DR

This paper introduces dynamic control techniques for cavity QED quantum gates, significantly increasing their speed and reducing cavity quality requirements, thus advancing scalable quantum computing with integrated optical systems.

Contribution

It presents novel Stark shift based Q-switching methods enabling scalable, high-speed cavity-QED quantum gates with improved efficiency and practicality.

Findings

Achieved an order of magnitude increase in gate operation speed.

Reduced cavity Q requirements by two orders of magnitude.

Demonstrated compatibility with solid-state integrated optical systems.

Abstract

Cavity quantum electrodynamic schemes for quantum gates are amongst the earliest quantum computing proposals. Despite continued progress, and the dramatic recent demonstration of photon blockade, there are still issues with optimal coupling and gate operation involving high-quality cavities. Here we show dynamic control techniques that allow scalable cavity-QED based quantum gates, that use the full bandwidth of the cavities. When applied to quantum gates, these techniques allow an order of magnitude increase in operating speed, and two orders of magnitude reduction in cavity Q, over passive cavity-QED architectures. Our methods exploit Stark shift based Q-switching, and are ideally suited to solid-state integrated optical approaches to quantum computing.