Entanglement and Disentanglement in Circuit QED Architectures

TL;DR

This paper presents a protocol for generating and analyzing entanglement in a dissipative circuit QED network, focusing on creation, interaction, and decay of entangled states within a realistic environment.

Contribution

It introduces a method to generate entangled cavity-qubit states and studies their decay in a circuit QED system with environmental interactions.

Findings

Successful creation of entangled cavity-qubit states via Landau-Zener sweeps

Implementation of a tunable quantum switch for cavity interaction

Analysis of entanglement decay due to environmental dissipation

Abstract

We propose a protocol for creating entanglement within a dissipative circuit QED network architecture that consists of two electromagnetic circuits (cavities) and two superconducting qubits. The system interacts with a quantum environment, giving rise to decoherence and dissipation. We discuss the preparation of two separate entangled cavity-qubit states via Landau-Zener sweeps, after which the cavities interact via a tunable "quantum switch" which is realized with an ancilla qubit. Moreover, we discuss the decay of the resulting entangled two-cavity state due to the influence of the environment, where we focus on the entanglement decay.