Engineered Tunable Decay Rate and Controllable Dissipative Dynamics

TL;DR

This paper demonstrates how modulating an assisted tunneling degree of freedom in a quantum-oscillator spin-boson model can significantly suppress qubit decoherence, enhance its quality factor, and reveal multi-peak dynamical susceptibility features, aiding quantum coherence preservation.

Contribution

It introduces a method to engineer tunable decay rates and controllable dissipative dynamics in a qubit through modulation of auxiliary degrees of freedom, advancing quantum coherence control.

Findings

Decoherence rate of qubit can be significantly suppressed

Quality factor of qubit is enhanced

Dynamical susceptibility shows multi-peak features

Abstract

We investigate the steering dissipative dynamics of a two-level system (qubit) by means of the modulation of an assisted tunneling degree of freedom which is described by a quantum-oscillator spin-boson model. Our results reveal that the decoherence rate of the qubit can be significantly suppressed and simultaneously its quality factor is enhanced. Moreover, the modulated dynamical susceptibility exhibits a multi-peak feature which is indicative of the underlying structure and measurable in experiment. Our findings demonstrate that the interplay between the combined degrees of freedom and the qubit is crucial for reducing the dissipation of qubit and expanding the coherent regime of quantum operation much large. The strategy might be used to fight against deterioration of quantum coherence in quantum information processing.