Atomic entanglement purification using photonic Faraday rotation

TL;DR

This paper presents a novel entanglement purification protocol for atomic pairs utilizing photonic Faraday rotation, enabling high-quality entangled states from mixed states in low-Q cavity systems, beneficial for quantum communication and computation.

Contribution

It introduces a new entanglement purification method that does not require intact initial pairs and works with low-Q cavities, expanding practical quantum network applications.

Findings

High-fidelity atomic entanglement can be achieved from mixed states.

The protocol operates effectively in low-Q cavity systems.

It is applicable to quantum communication and computation scenarios.

Abstract

We describe an entanglement purification protocol (EPP) for atomic entangled pair using photonic Faraday rotation. It is shown that after the two single photons input-output process in cavity QED, the high quality entangled atomic state can be obtained from the low quality mixed entangled atomic states. Different from other EPPs, the two pairs of mixed states do not need to intact directly. As the photonic Faraday rotation works on the low-Q cavities, this EPP is useful in both quantum communication and computation.