Efficient Heralding of Photonic Qubits with Apllications to Device Independent Quantum Key Distribution

TL;DR

This paper introduces an efficient heralding scheme for photonic qubits using linear optics, achieving near-perfect success rates and improving quantum key distribution performance even with finite resources.

Contribution

It presents a novel heralding method that asymptotically approaches perfect success probability and enhances device-independent quantum key distribution under realistic conditions.

Findings

Asymptotically perfect heralding with growing resources.

Finite-resource scheme achieves perfect heralded qubits.

Predicted improved key rates for quantum key distribution.

Abstract

We present an efficient way of heralding photonic qubit signals using linear optics devices. First we show that one can obtain asymptotically perfect heralding and unit success probability with growing resources. Second, we show that even using finite resources, we can improve qualitatively and quantitatively over earlier heralding results. In the latte r scenario, we can obtain perfect heralded photonic qubits while maintaining a finite success probability. We demonstrate the advantage of our heralding scheme by predicting key rates for device independent quantum key distribution, taking imperfections of sources and detectors into account.