Entanglement swapping between electromagnetic field modes and matter qubits

TL;DR

This paper demonstrates how entanglement between matter qubits and electromagnetic field modes can be used to generate entangled states of distant qubits, advancing scalable quantum network capabilities.

Contribution

It introduces an analytical framework for entanglement swapping using the Jaynes-Cummings model, including decoherence effects, to produce highly entangled remote qubits.

Findings

Analytical expressions for linear entropy and density matrix of entangled qubits.

Decoherence effects on entanglement generation analyzed.

Scheme successfully creates highly entangled states from separable states.

Abstract

Scalable quantum networks require the capability to create, store and distribute entanglement among distant nodes (atoms, trapped ions, charge and spin qubits built on quantum dots, etc.) by means of photonic channels. We show how the entanglement between qubits and electromagnetic field modes allows generation of entangled states of remotely located qubits. We present analytical calculations of linear entropy and the density matrix for the entangled qubits for the system described by the Jaynes-Cummings model. We also discuss the influence of decoherence. The presented scheme is able to drive an initially separable state of two qubits into an highly entangled state suitable for quantum information processing.