Coupling a single Nitrogen-Vacancy center to a superconducting flux qubit in the far off resonance regime

TL;DR

This paper proposes a theoretical method to couple a single Nitrogen-Vacancy center with a superconducting flux qubit off resonance, enabling quantum control, tomography, and memory applications in a hybrid quantum system.

Contribution

It introduces a novel off-resonance coupling scheme using dressed states for hybrid quantum systems involving NV centers and flux qubits.

Findings

Coupling via strong microwave driving creates controllable dressed states.

The framework enables NV center manipulation and quantum memory functions.

Decoherence effects are analyzed for practical implementation.

Abstract

We present a theoretical proposal to couple a single Nitrogen-Vacancy (NV) center to a superconducting flux qubit (FQ) in the regime where both systems are off resonance. The coupling between both quantum devices is achieved through the strong driving of the flux qubit by a classical microwave field that creates dressed states with an experimentally controlled characteristic frequency. We discuss several applications such as controlling the NV center's state by manipulation of the flux qubit, performing the NV center full tomography and using the NV center as a quantum memory. The effect of decoherence and its consequences to the proposed applications are also analyzed. Our results provide a theoretical framework describing a promising hybrid system for quantum information processing, which combines the advantages of fast manipulation and long coherence times.