Entanglement of flux qubits through a joint detection of photons

TL;DR

This paper proposes a scheme to entangle two flux qubits via photon interference and entanglement swapping, enabling the creation of highly entangled states for quantum computing without direct qubit interaction.

Contribution

It introduces a novel method for entangling flux qubits through joint photon detection, analyzing effects of off-resonance and multi-photon states on entanglement.

Findings

Entanglement can be generated between flux qubits without direct interaction.

The scheme effectively produces highly entangled states suitable for quantum information.

Off-resonance and multi-photon states influence the entanglement quality.

Abstract

We study the entanglement creation between two flux qubits interacting with electromagnetic field modes. No direct interaction between the qubits exists. Entanglement is reached using entanglement swapping method by an interference measurement performed on photons. We discuss the influence of off-resonance and multi-photon initial states on the qubit-qubit entanglement. The presented scheme is able to drive an initially separable state of two qubits into an highly entangled state suitable for quantum information processing.