Generation and stabilization of Bell states via repeated projective measurements on a driven ancilla qubit

TL;DR

This paper proposes a protocol to generate and stabilize Bell states between two non-interacting qubits using repeated projective measurements on a driven ancilla, optimizing measurement rate to enhance entanglement quality.

Contribution

It introduces a novel measurement-based protocol for Bell state generation via an ancilla, including an optimal measurement rate to improve efficiency and stability.

Findings

Optimal measurement rate minimizes entanglement generation time.

High concurrence and fidelity achieved with the protocol.

Protocol reduces environmental effects on entanglement stability.

Abstract

A protocol is proposed to generate Bell states in two non-directly interacting qubits by means of repeated measurements of the state of a central ancilla connected to both qubits. An optimal measurement rate is found that minimizes the time to stably encode a Bell state in the target qubits, being of advantage in order to reduce detrimental effects from possible interactions with the environment. The quality of the entanglement is assessed in terms of the concurrence and the distance between the qubits state and the target Bell state is quantified by the fidelity.