Engineering protected cavity-QED interactions through pulsed dynamical decoupling

TL;DR

This paper develops pulsed dynamical decoupling techniques to enhance cavity QED interactions under noise, enabling high-fidelity quantum operations and tunable couplings.

Contribution

It introduces specific pulse sequences that suppress noise effects in cavity QED, allowing for improved coherence and flexible interaction types.

Findings

Boosts effective cooperativity by several orders of magnitude

Enhances fidelity of quantum operations

Enables realization of various coupling regimes

Abstract

We study a generic cavity QED setup under conditions where the coupling between the two-level systems and a single bosonic mode is significantly degraded by low-frequency noise. To overcome this problem, we identify pulsed dynamical decoupling strategies that suppress the effects of noise while still allowing for a coherent exchange of excitations between the individual subsystems. The corresponding pulse sequences can be further designed to realize either Jaynes-Cummings, anti-Jaynes-Cummings, or Rabi couplings, as well as different types of cavity-mediated interactions between the two-level systems. A detailed analysis of the residual imperfections demonstrates that this decoupling strategy can boost the effective cooperativity of the cavity QED system by several orders of magnitude and improve the fidelity of quantum-technologically relevant operations accordingly.