Quantum Noise in the Electromechanical Shuttle

TL;DR

This paper investigates quantum noise in the electromechanical shuttle system using quantum master equations, comparing semi-classical and quantum simulations, and analyzing how noise spectra reveal transitions between tunneling and shuttling regimes.

Contribution

It provides a detailed quantum analysis of the shuttle system's noise characteristics and compares quantum and semi-classical approaches to understand its dynamics.

Findings

Noise spectrum reveals transition between tunneling and shuttling regimes

Quantum simulations provide insights beyond semi-classical models

Current noise can be used to measure system dynamics

Abstract

We consider a type of Quantum Electro-Mechanical System, known as the shuttle system, first proposed by Gorelik et al., [Phys. Rev. Lett., 80, 4526, (1998)]. We use a quantum master equation treatment and compare the semi-classical solution to a full quantum simulation to reveal the dynamics, followed by a discussion of the current noise of the system. The transition between tunnelling and shuttling regime can be measured directly in the spectrum of the noise.