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Demonstration of quantum-digital payments.

Peter Schiansky1, Julia Kalb1, Esther Sztatecsny1

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This study introduces quantum cryptograms for secure digital payments, offering unforgeable transactions resistant to quantum attacks. The practical, near-term technology enhances security without complex infrastructure, paving the way for quantum-enabled financial systems.

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Area of Science:

  • Quantum Information Science
  • Cybersecurity
  • Applied Physics

Background:

  • Digital payments rely on cryptographic functions (cryptograms) for uniqueness and security.
  • Current cryptograms are vulnerable to computationally powerful attacks, including future quantum computing threats.
  • Existing quantum security protocols often require complex infrastructure like long-term quantum storage.

Purpose of the Study:

  • To develop a practical quantum-based solution for securing digital payments.
  • To create inherently unforgeable quantum cryptograms resistant to advanced attacks.
  • To demonstrate a quantum security protocol feasible with near-term technology.

Main Methods:

  • Utilizing quantum light to generate unique and unforgeable quantum cryptograms.
  • Implementing the quantum cryptogram scheme over a deployed urban optical fiber network.
  • Testing the system's resilience against environmental noise and loss-dependent security attacks.

Main Results:

  • Demonstrated the successful generation and transmission of quantum cryptograms over an urban optical fiber link.
  • Confirmed the robustness of the quantum cryptogram scheme against noise and loss-dependent attacks.
  • Showcased a practical quantum security solution that avoids reliance on long-term quantum storage or trusted intermediaries.

Conclusions:

  • Quantum light offers a viable method for creating inherently unforgeable quantum cryptograms for digital payments.
  • The implemented scheme is practical for near-term deployment, enhancing digital payment security against sophisticated threats.
  • This work may initiate an era of quantum-enhanced security in everyday digital transactions.