Faithful entanglement sharing for quantum communication against collective noise

TL;DR

This paper introduces an economical and efficient method for faithful entanglement sharing in quantum communication that is robust against collective noise, using standard optical components without additional qubits or complex detectors.

Contribution

It proposes a novel setup that achieves near-perfect success probability for entanglement sharing under noise without extra resources, applicable to one-way quantum communication protocols.

Findings

Success probability approaches 100%, independent of noise parameters

Effective rejection of arbitrary qubit errors caused by collective noise

Compatible with existing quantum communication protocols

Abstract

We present an economical setup for faithful entanglement sharing against collective noise. It is composed of polarizing beam splitters, half wave plates, polarization independent wavelength division multiplexers, and frequency shifters. An arbitrary qubit error on the polarization state of each photon in a multi-photon system caused by the noisy channel can be rejected, without resorting to additional qubits, fast polarization modulators, and nondestructive quantum nondemolition detectors. Its success probability is in principle 100%, which is independent of the noise parameters, and it can be applied directly in any one-way quantum communication protocol based on entanglement.