Efficient entanglement purification for polarization logic Bell state with the photonic Faraday rotation

TL;DR

This paper presents a novel, efficient entanglement purification protocol for logic Bell states using photon-atom interactions, capable of correcting both bit-flip and phase-flip errors in quantum networks.

Contribution

The proposed protocol uniquely purifies both bit-flip and phase-flip errors in logic Bell states using low-Q cavity photon-atom interactions, improving entanglement quality.

Findings

Protocol effectively purifies logic Bell states with mixed errors.

Requires only atomic state measurements, simplifying implementation.

Enhances entanglement fidelity for large-scale quantum networks.

Abstract

Logic-qubit entanglement is a promising resource in quantum information processing, especially in future large-scale quantum networks. In the paper, we put forward an efficient entanglement purification protocol (EPP) for nonlocal mixed logic entangled states with the bit-flip error in the logic qubits of the logic Bell state, resorting to the photon-atom interaction in low-quality (Q) cavity and atomic state measurement. Different from existing EPPs, this protocol can also purify the logic phase-flip error, and the bit-flip error and the phase-flip error in physic qubit. During the protocol, we only require to measure the atom states, and it is useful for improving the entanglement of photon systems in future large-scale quantum networks.