Enhanced security in Quantum Token protocols using Hybrid Spin-Photon Interfaces

TL;DR

This paper enhances quantum token protocols by integrating hybrid spin-photon interfaces, improving security through tripartite entanglement, Bell measurements, and coherent spin memories, with practical implementation in diamond-based systems.

Contribution

It introduces a novel approach to quantum token security using hybrid spin-photon interfaces and details a feasible physical implementation with diamond spins.

Findings

Increased security in quantum token protocols.

Implementation feasibility with diamond-based systems.

Utilization of tripartite entanglement and Bell measurements.

Abstract

Quantum token protocols enable unforgeable quantum tokens promising unconditional security beyond classical cryptographic assumptions. We show here that the three stages of the Quantum token protocols involving the preparation, storage and verification can be made more secure when involving spin-photon interfaces that leverage high fidelity hybrid tripartite (spin-photon-spin) entanglement, Bell state measurements and highly coherent spin quantum memories. Further we describe the physical implementation of various stages of the protocol using the hybrid electron and nuclear spins in diamond interfaced with time-bin photons.