Experimental Quantum Channel Purification

TL;DR

This paper presents an experimental quantum channel purification method using photon properties and Fredkin gates, effectively reducing noise and preserving entanglement in quantum networks.

Contribution

It introduces a novel experimental setup employing Fredkin gates for efficient quantum channel purification, enhancing noise suppression capabilities.

Findings

Effective noise suppression across various noise levels and types

Superior entanglement preservation compared to traditional methods

Demonstrated feasibility in entanglement distribution

Abstract

Quantum networks, which integrate multiple quantum computers and the channels connecting them, are crucial for distributed quantum information processing but remain inherently susceptible to channel noise. Channel purification emerges as a promising technique for suppressing noise in quantum channels without complex encoding and decoding operations, making it particularly suitable for remote quantum information transmission in optical systems. In this work, we introduce an experimental setup for efficient channel purification, harnessing the spatial and polarization properties of photons. Our design employs two Fredkin gates to enable coherent interference between independent noise channels, achieving effective noise suppression across a wide range of noise levels and types. Through application to entanglement distribution, our protocol demonstrates a superior capability to preserve entanglement against channel noise compared to conventional entanglement purification methods.