Engineering and Suppression of Decoherence in Two Qubit Systems

TL;DR

This paper introduces combined decoherence engineering techniques for two-qubit systems, demonstrating suppression of decoherence through stochastic kicks, randomized pulses, and novel coupling interactions, including a counter-intuitive noise suppression phenomenon.

Contribution

It proposes a new coupling interaction leading to amplitude damping and combines two decoherence suppression methods, enhancing control over quantum decoherence processes.

Findings

Decoherence can be suppressed with combined stochastic and randomized methods.

A new coupling interaction results in amplitude damping instead of phase damping.

Decoherence suppression occurs under specific resonant conditions despite multiple noise sources.

Abstract

In this work, two experimentally feasible methods of decoherence engineering-one based on the application of stochastic classical kicks and the other based on temporally randomized pulse sequences are combined. A different coupling interaction is proposed, which leads to amplitude damping as compared to existing methods which model phase damping, utilizing the $zz$ coupling interaction. The decoherence process on combining the stochastic kick method and the randomized pulse sequence method and the effectiveness of dynamical decoupling under these coupling interactions are analyzed. Finally, a counter-intuitive result where decoherence is suppressed in the presence of two noise sources under certain resonant conditions is presented.