Chaos can act as a decoherence suppressor

TL;DR

This paper introduces a novel decoherence suppression method for solid-state qubits using a chaotic setup driven by low-frequency fields, effectively broadening the noise spectrum and significantly prolonging qubit coherence times.

Contribution

The study presents a new approach leveraging chaos to suppress decoherence without complex pulse optimization, applicable to various noise types in superconducting circuits.

Findings

Decoherence time extended by approximately 100 times.

Effective suppression of multiple noise types including 1/f, Ohmic, sub-Ohmic, super-Ohmic.

Chaotic setup driven by low-frequency fields can generate broad high-frequency control components.

Abstract

We propose a strategy to suppress decoherence of a solid-state qubit coupled to non-Markovian noises by attaching the qubit to a chaotic setup with the broad power distribution in particular in the high-frequency domain. Different from the existing decoherence control methods such as the usual dynamics decoupling control, high-frequency components of our control are generated by the chaotic setup driven by a low-frequency field, and the generation of complex optimized control pulses is not necessary. We apply the scheme to superconducting quantum circuits and find that various noises in a wide frequency domain, including low-frequency $1/f$, high-frequency Ohmic, sub-Ohmic, and super-Ohmic noises, can be efficiently suppressed by coupling the qubits to a Duffing oscillator as the chaotic setup. Significantly, the decoherence time of the qubit is prolonged approximately $100$ times in magnitude.