Quantum entanglement degrees amplifier

TL;DR

This paper proposes a novel entanglement degrees amplifier using one-dimensional photonic crystals to enhance and preserve quantum entanglement over long distances, facilitating practical quantum communication.

Contribution

It introduces a new entanglement amplifier design based on photonic crystals that can magnify entanglement degrees of multi-photon states during transmission.

Findings

Entanglement degrees can be amplified by passing through photonic crystals.

The amplifier enables long-distance propagation of entangled states.

Quantum communication can be practically realized with this method.

Abstract

The quantum entangled degrees of entangled states become smaller with the transmission distance increasing, how to keep the purity of quantum entangled states is the puzzle in quantum communication. In the paper, we have designed a new type entanglement degrees amplifier by one-dimensional photonic crystal, which is similar as the relay station of classical electromagnetic communication. We find when the entangled states of two-photon and three-photon pass through photonic crystal, their entanglement degrees can be magnified, which make the entanglement states can be long range propagation and the quantum communication can be really realized.