Quantum hashing via single-photon states with orbital angular momentum

TL;DR

This paper presents a quantum hashing method using single-photon states with orbital angular momentum, experimentally verifying collision resistance and potential cryptographic applications.

Contribution

It introduces a novel quantum hash construction with OAM encoding and provides experimental validation of its collision resistance properties.

Findings

Collision resistance verified experimentally

Theoretical estimates confirmed for different OAM bases

Potential for multiplexing enhances efficiency

Abstract

Quantum hashing is a promising generalization of the cryptographic hashing concept on the quantum domain. In this paper, we construct a quantum hash via a sequence of single-photon states and perform a proof-of-principle experiment using orbital angular momentum (OAM) encoding. We experimentally verify the collision resistance of the quantum hash function depending on the number of qubits in use. Based on these results, we conclude that theoretical estimates are confirmed for different bases of OAM states and the proposed technique can be useful in computational and cryptographic scenarios. The possibility of multiplexing different OAM bases can make this approach even more efficient.