Quantum Decoherence of Charge Qubit coupled to Nonlinear Nanomechanical Resonator

TL;DR

This paper analyzes how nonlinearity in a nanomechanical resonator affects the quantum decoherence of a coupled charge qubit, revealing that nonlinearity disrupts quantum information storage but also influences coherence revival.

Contribution

It provides an analytical study of quantum decoherence in a nonlinear nanomechanical resonator coupled to a charge qubit using a nonlinear Jaynes-Cummings model.

Findings

Nonlinearity destroys quantum data storage in the system.

Nonlinearity affects the revival of quantum coherence.

Decoherence factor calculations demonstrate the influence of nonlinearity.

Abstract

When the nonlinearity of nanomechanical resonator is not negligible, the quantum decoherence of charge qubit is studied analytically. Using nonlinear Jaynes-Cummings model, one explores the possibility of being quantum data bus for nonlinear nanomechanical resonator, the nonlinearity destroys the dynamical quantum information-storage and maintains the revival of quantum coherence of charge qubit. With the calculation of decoherence factor, we demonstrate the influence of the nonlinearity of nanomechanical resonator on engineered decoherence of charge qubit.