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Related Experiment Video

Updated: Jul 6, 2025

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

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All-optical multilevel physical unclonable functions.

Sara Nocentini1,2, Ulrich Rührmair3,4, Mauro Barni5

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

Nature Materials
|January 8, 2024
PubMed
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.