Controllable Coupling between Flux Qubit and Nanomechanical Resonator by Magnetic Field

TL;DR

This paper introduces a controllable coupling mechanism between a flux qubit and a nanomechanical resonator using an external magnetic field, enabling strong coupling in a solid-state cavity QED system for quantum information applications.

Contribution

It presents a novel, externally tunable coupling method between flux qubits and nanomechanical resonators within a solid-state cavity QED framework.

Findings

Achieves strong, controllable coupling in a solid-state system.

Demonstrates potential for quantum optics phenomena and quantum information processing.

Addresses practical considerations for experimental implementation.

Abstract

We propose an active mechanism for coupling the quantized mode of a nanomechanical resonator to the persistent current in the loop of a superconducting Josephson junction (or phase slip) flux qubit. This coupling is independently controlled by an external coupling magnetic field. The whole system forms a novel solid-state cavity quantum electrodynamics (QED) architecture in the strong coupling limit. This architecture can be used to demonstrate quantum optics phenomena and coherently manipulate the qubit for quantum information processing. The coupling mechanism is applicable for more generalized situations where the superconducting Josephson junction system is a multi-level system.We also address the practical issues concerning experimental realization.