Macroscopic quantum oscillator based on a flux qubit

TL;DR

This paper introduces a macroscopic quantum oscillator combining a flux qubit and a cantilever, demonstrating entanglement between magnetic flux and mechanical displacement controlled by an external magnetic field.

Contribution

It presents a novel macroscopic quantum oscillator design using a flux qubit as a cantilever, enabling controllable coupling and entanglement between magnetic and mechanical degrees of freedom.

Findings

Ground state exhibits quantum entanglement between flux and displacement.

Coupling strength is tunable via external magnetic field.

Potential applications in quantum information processing.

Abstract

In this paper a macroscopic quantum oscillator is introduced that consists of a flux qubit in the form of a cantilever. The magnetic flux linked to the flux qubit and the mechanical degrees of freedom of the cantilever are naturally coupled. The coupling is controlled through an external magnetic field. The ground state of the introduced flux-qubit-cantilever corresponds to a quantum entanglement between magnetic flux and the cantilever displacement.