Single-photon entanglement concentration for long-distance quantum communication

TL;DR

This paper introduces a novel single-photon entanglement concentration protocol that enhances long-distance quantum communication by being experimentally feasible, not requiring precise state knowledge, and allowing iteration for improved efficiency.

Contribution

It is the first protocol for single-photon entanglement concentration that does not need detailed state information or advanced detectors, improving practicality for quantum networks.

Findings

First entanglement concentration protocol for single-photon states

Does not require knowledge of state coefficients

Can be iterated for higher efficiency

Abstract

We present a single-photon entanglement concentration protocol for long-distance quantum communication with quantum nondemolition detector. It is the first concentration protocol for single-photon entangled states and it dose not require the two parties of quantum communication to know the accurate information about the coefficient $\alpha$ and $\beta$ of the less entangled states. Also, it does not resort to sophisticated single-photon detectors, which makes this protocol more feasible in current experiments. Moreover, it can be iterated to get a higher efficiency and yield. All these advantages maybe make this protocol have more practical applications in long-distance quantum communication and quantum internet.