Quantum Entanglement of Flux Qubits via a Resonator

TL;DR

This paper demonstrates a method to entangle flux qubits using a tunable resonant circuit, producing pure Bell states with minimal entanglement of the resonator, inspired by atomic entanglement schemes.

Contribution

It introduces a novel entanglement scheme for flux qubits via a resonator, achieving high-fidelity Bell states with a single-photon excitation.

Findings

Flux qubits can be entangled through a tunable resonator.

Single-photon excitation creates pure Bell states.

Resonator remains disentangled after entanglement creation.

Abstract

We show that flux qubits can be efficiently entangled by inductive coupling to a tunable resonant circuit, in the scheme reminiscent of atoms' entanglement through the optical cavity mode. It is shown, in particular, that the single-photon excitation of the resonator produces the pure Bell state of qubits with the completely disentangled LC circuit.