Entanglement concentration and purification of two-mode squeezed microwave photons in circuit QED

TL;DR

This paper proposes a theoretical scheme for entanglement concentration and purification of two-mode squeezed microwave photons in circuit QED, utilizing cross-Kerr effects and quantum nondemolition measurements to enhance microwave quantum communication.

Contribution

It introduces a novel method combining cross-Kerr effects and QND measurements for entanglement purification in microwave photons within circuit QED.

Findings

Feasible with current experimental technology.

Enables improved quantum communication protocols.

Provides detailed parameter analysis for implementation.

Abstract

We present a theoretical proposal for a physical implementation of entanglement concentration and purification protocols for two-mode squeezed microwave photons in circuit quantum electrodynamics (QED). First, we give the description of the cross-Kerr effect induced between two resonators in circuit QED. Then we use the cross-Kerr media to design the effective quantum nondemolition (QND) measurement on microwave-photon number. By using the QND measurement, the parties in quantum communication can accomplish the entanglement concentration and purification of nonlocal two-mode squeezed microwave photons. We discuss the feasibility of our schemes by giving the detailed parameters which can be realized with current experimental technology. Our work can improve some practical applications in continuous-variable microwave-based quantum information processing.