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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

All-optical multilevel physical unclonable functions.

Sara Nocentini^1,2, Ulrich Rührmair^3,4, Mauro Barni⁵

¹Istituto Nazionale di Ricerca Metrologica, Turin, Italy. nocentini@lens.unifi.it.

Nature Materials

|January 8, 2024

Summary

This summary is machine-generated.

Researchers developed reconfigurable disordered photonic structures for advanced physical unclonable functions (PUFs). This innovation enables multiple, simultaneously active PUFs on a single device, enhancing security and enabling quantum-resistant cryptography.

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Area of Science:

Photonics and Materials Science
Information Security and Cryptography

Background:

Disordered photonic structures offer potential for physical unclonable functions (PUFs) crucial for advanced security.
Traditional PUFs have fixed or permanently modifiable structures, limiting their practicality and scalability.
Existing PUFs cannot overcome limitations of digital security or provide quantum-computer-resistant cryptographic protocols.

Purpose of the Study:

To overcome the limitations of traditional physical unclonable functions by creating reconfigurable structures.
To enable the simultaneous coexistence of multiple PUFs within a single device.
To develop a platform for quantum-secure authentication and nonlinear cryptographic key generation.

Main Methods:

Creation of reconfigurable structures using light-transformable polymers.
All-optical, reversible, and spatially controlled reconfiguration of the physical structure.
Implementation of switchable individual PUFs for multi-client authentication.

Main Results:

Demonstrated reversible reconfiguration of PUF physical structure.
Enabled simultaneous coexistence of multiple PUFs on one device.
Facilitated generation of complex keys and multi-client authentication.

Conclusions:

The developed light-transformable polymer structures offer a practical solution for reconfigurable PUFs.
This approach enhances security by enabling multiple, dynamic PUFs per device.
The technology paves the way for practical quantum-secure authentication and advanced cryptographic key generation.