Deterministic polarization-entanglement purification using spatial entanglement

TL;DR

This paper introduces a deterministic entanglement purification protocol leveraging spatial entanglement to correct polarization errors in a single step using passive linear optics, enhancing quantum communication reliability.

Contribution

The novel protocol uses hyperentanglement to purify polarization entanglement deterministically with passive linear optics, addressing practical quantum source and noisy channel issues.

Findings

Errors are corrected in one step

Maximally entangled states are obtained deterministically

Protocol is robust with practical sources and noisy channels

Abstract

We present an efficient entanglement purification protocol with hyperentanglement in which additional spatial entanglement is utilized to purify the two-particle polarization-entangled state. The bit-flip error and phase-flip error can be corrected and eliminated in one step. Two remote parties can obtainmaximally entangled polarization states deterministically and only passive linear optics are employed. We also discuss the protocol with practical quantum source and noisy channel.