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Device-Independent Quantum Key Activation.

Bora Ulu1, Nicolas Brunner1, Mirjam Weilenmann1,2

  • 1University of Geneva, Department of Applied Physics, Geneva, Switzerland.

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Summary
This summary is machine-generated.

Device-independent quantum key distribution (DIQKD) can be activated from useless distributions by jointly processing multiple copies. This "device-independent key activation" enables secret key establishment with minimal resources.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Quantum Communication Security

Background:

  • Device-independent quantum key distribution (DIQKD) enables secure key establishment based on observed Bell nonlocal distributions.
  • Optimal resource utilization and key rate maximization in DIQKD remain open challenges.

Purpose of the Study:

  • To investigate the minimal resources required for DIQKD.
  • To explore methods for maximizing the key rate from a given quantum distribution.
  • To introduce and analyze the concept of 'device-independent key activation'.

Main Methods:

  • Analysis of a scenario involving joint processing of multiple quantum distribution copies.
  • Application of local and classical wiring operations.
  • Focus on the standard DIQKD protocol with one-way postprocessing.
  • Utilizing semidefinite programming techniques to compute key rate lower bounds.

Main Results:

  • Demonstration of 'device-independent key activation': enabling DIQKD from distributions previously considered useless.
  • Achieving a positive asymptotic key rate by wiring several copies of a quantum distribution.
  • Identification of a method to activate device-independent key under minimal assumptions.

Conclusions:

  • Device-independent key activation is a viable strategy to enhance DIQKD protocols.
  • Joint processing of multiple quantum distribution copies can overcome limitations of individual distributions.
  • This work contributes to understanding minimal resource requirements for DIQKD and maximizing key rates.