Generating entanglement between microwave photons and qubits in multiple cavities coupled by a superconducting qutrit

TL;DR

This paper proposes a method to generate entangled states of microwave resonators and qubits using a superconducting qutrit, enabling scalable quantum networks with potential applications in quantum information processing.

Contribution

The paper introduces a scheme to create entangled coherent states of multiple resonators and GHZ states of qubits, extendable to larger networks for scalable quantum computing.

Findings

Successfully generates entangled states of four microwave resonators.

Creates GHZ states of four qubits in separate resonators.

Proposes a scalable architecture for quantum networks.

Abstract

We discuss how to generate entangled coherent states of four \textrm{microwave} resonators \textrm{(a.k.a. cavities)} coupled by a superconducting qubit. We also show \textrm{that} a GHZ state of four superconducting qubits embedded in four different resonators \textrm{can be created with this scheme}. In principle, \textrm{the proposed method} can be extended to create an entangled coherent state of $n$ resonators and to prepare a Greenberger-Horne-Zeilinger (GHZ) state of $n$ qubits distributed over $n$ cavities in a quantum network. In addition, it is noted that four resonators coupled by a coupler qubit may be used as a basic circuit block to build a two-dimensional quantum network, which is useful for scalable quantum information processing.