Entangled microwaves as a resource for entangling spatially separate solid-state qubits: superconducting qubits, NV centers and magnetic molecules

TL;DR

This paper demonstrates how broadband two-line squeezed microwaves can generate and transfer entanglement to spatially separated solid-state qubits, including superconducting qubits, NV centers, and magnetic molecules, through dissipation.

Contribution

It introduces a master equation approach to characterize entanglement transfer via entangled microwave baths in various solid-state quantum systems.

Findings

Steady-state entanglement can be achieved and optimized in different solid-state qubits.

Entanglement transfer via dissipation is feasible in realistic experimental setups.

The method applies to NV centers, superconducting qubits, and magnetic molecules.

Abstract

Quantum correlations present in a broadband two-line squeezed microwave state can induce entanglement in a spatially separated bipartite system consisting of either two single qubits or two qubit ensembles. By using an appropriate master equation for a bipartite quantum system in contact with two separate but entangled baths, the generating entanglement process in spatially separated quantum systems is thoroughly characterized. Our results provide evidence that this entanglement transfer by dissipation is feasible yielding to a steady-state amount of entanglement in the bipartite quantum system which can be optimized for a wide range of realistic physical systems that include state-of-the-art experiments with NV centers in diamond, superconducting qubits or even magnetic molecules embedded in a crystalline matrix.