Quantum Key Distribution with High Order Fibonacci-like Orbital Angular Momentum States

TL;DR

This paper introduces a high-capacity quantum key distribution protocol utilizing entangled photons with orbital angular momentum states based on high order Fibonacci-like sequences, enhancing security and efficiency without complex alignment.

Contribution

The work presents a novel QKD scheme using entangled OAM states with Fibonacci-like distributions, eliminating the need for reference frame alignment and active basis modulation.

Findings

Protocol is immune to photon-number-splitting attacks.

Enables secure long-key generation from few photons.

Does not require reference frame alignment or active basis modulation.

Abstract

The coding space in quantum communication could be expanded to high-dimensional space by using orbital angular momentum (OAM) states of photons, as both the capacity of the channel and security are enhanced. Here we present a novel approach to realize high-capacity quantum key distribution (QKD) by exploiting OAM states. The innovation of the proposed approach relies on a unique type of entangledphoton source which produces entangled photons with OAM randomly distributed among high order Fiboncci-like numbers and a new physical mechanism for efficiently sharing keys. This combination of entanglement with mathematical properties of high order Fibonacci sequences provides the QKD protocol which is immune to photon-number-splitting attacks and allows secure generation of long keys from few photons. Unlike other protocols, reference frame alignment and active modulation of production and detection bases are unnecessary.