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Improving the longevity of optically-read quantum dot physical unclonable functions.

Kieran D Longmate1, Nema M Abdelazim1,2, Elliott M Ball1

  • 1Physics Department, Lancaster University, Lancaster, LA1 4YB, UK.

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Quantum dot physically unclonable functions (QD-PUFs) offer a novel anti-counterfeiting solution. By stabilizing quantum dot photoluminescence and using fingerprinting, QD-PUFs ensure reliable authentication even after degradation.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Counterfeiting poses significant economic and security risks.
  • Quantum dot physically unclonable functions (QD-PUFs) leverage unique quantum dot patterns for authentication.
  • Degradation of quantum dot optical properties limits the long-term reliability of QD-PUFs.

Purpose of the Study:

  • To develop methods for minimizing photoluminescence degradation in quantum dots.
  • To demonstrate reliable authentication using QD-PUFs even after degradation.
  • To enhance the longevity and practical utility of QD-PUF devices.

Main Methods:

  • Investigated photoluminescence (PL) degradation of InP/ZnS quantum dots in polymer matrices.
  • Incorporated polylauryl methacrylate (PLMA) copolymer to improve device stability.
  • Utilized a fingerprinting technique to extract authentication signatures from PL data.

Main Results:

  • Addition of PLMA copolymer significantly improved the longevity of QD-PUF devices.
  • Polystyrene-PLMA based materials showed the best performance in terms of stability.
  • Projected extraction of 1000 bits of information after several years, indicating robust authentication.

Conclusions:

  • Methods to minimize degradation enhance the practical application of QD-PUFs.
  • QD-PUFs with improved longevity offer a compelling solution for anti-counterfeiting.
  • This research paves the way for long-term, reliable quantum dot-based security solutions.