Suppressing non-Markovian noises by coupling the qubit to a chaotic device

TL;DR

This paper proposes a novel method to suppress non-Markovian noise in solid-state qubits by coupling them to a chaotic device, effectively reducing decoherence without complex control pulses.

Contribution

The study introduces a new approach using chaotic devices to suppress broad-spectrum noise in qubits, avoiding the need for optimized control fields as in dynamical decoupling.

Findings

Decoherence rate decreased by about 100 times.

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

Coupling to a Duffing oscillator enhances qubit coherence in superconducting circuits.

Abstract

To suppress decoherence of solid-state qubits which are coupled to the non-Markovian noises, we propose a strategy to couple the qubit with a chaotic device, of which the broad power distribution in the high-frequency domain can be used to freeze the noises just like the dynamical decoupling control (DDC) method. Compared with the DDC, high-frequency components can be generated by the chaotic device even driven by a low-frequency field and we do not need to optimize the control fields to generate complex control pulses. As an application to superconducting circuits, we 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 qubit to a Duffing oscillator, and the decoherence rate of the qubit is efficiently decreased for about 100 times in magnitude.