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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Practical high-dimensional quantum key distribution protocol over deployed multicore fiber.

Mujtaba Zahidy1, Domenico Ribezzo2,3,4, Claudia De Lazzari5

  • 1Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Pl., Kgs. Lyngby, 2800, Denmark.

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|February 23, 2024
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Summary
This summary is machine-generated.

High-dimensional quantum key distribution (QKD) using a 4-dimensional hybrid time-path encoding system achieved secure key generation over a 52-km multicore fiber link. This demonstrates robust QKD implementation in realistic environments using standard telecom equipment.

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Area of Science:

  • Quantum Information Science
  • Cybersecurity
  • Optical Communications

Background:

  • Quantum key distribution (QKD) offers secure communication based on quantum physics.
  • Increasing data rates necessitate higher secret key generation rates in QKD systems.
  • High-dimensional QKD (HD-QKD) using path encoding is a promising approach to boost performance.

Purpose of the Study:

  • To demonstrate the feasibility of high-dimensional QKD in a realistic, deployed network environment.
  • To address the lack of practical demonstrations for HD-QKD systems beyond lab settings.
  • To investigate the performance of a 4-dimensional hybrid time-path-encoded QKD system over optical fiber.

Main Methods:

  • Implemented a 4-dimensional hybrid time-path-encoded QKD system.
  • Utilized a 52-km deployed multicore fiber link (two cores of a 26-km 4-core fiber).
  • Combined standard telecommunication equipment with multicore fiber technology.

Main Results:

  • Successfully generated secret keys using the 4-dimensional hybrid time-path-encoded QKD system.
  • Demonstrated robust QKD performance over the 52-km deployed multicore fiber link.
  • Validated the integration of standard telecom equipment with multicore fiber for practical QKD.

Conclusions:

  • High-dimensional QKD can be robustly implemented in realistic network conditions.
  • The combination of standard telecom equipment and multicore fiber technology is viable for practical QKD.
  • This work paves the way for secure, high-rate quantum communication in deployed fiber networks.