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Quantum key distribution implemented with d-level time-bin entangled photons.

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We developed an integrated photonic platform for high-dimensional quantum communications using time-bin entangled qudits. This system achieves high processing speeds and dimensionality scaling over long fiber links, advancing quantum networks.

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Area of Science:

  • Quantum Information Science
  • Integrated Photonics
  • Quantum Communications

Background:

  • High-dimensional photon states (qudits) are crucial for advancing quantum communication capabilities.
  • Time-bin entangled qudits offer potential for high-capacity quantum communication over optical fibers.
  • Existing methods face challenges like phase instability, timing inaccuracies, and scalability issues.

Purpose of the Study:

  • To develop a robust and scalable platform for generating and processing time-bin entangled qudits.
  • To overcome limitations of current interferometric schemes for time-bin processing.
  • To demonstrate high-dimensional quantum key distribution with enhanced performance.

Main Methods:

  • Utilized a fiber-pigtailed, integrated photonic platform with on-chip interferometry.
  • Generated and processed picosecond-spaced time-bin entangled qudits in the telecommunication C band.
  • Experimentally demonstrated the Bennett-Brassard-Mermin 1992 quantum key distribution protocol.

Main Results:

  • Achieved generation and processing of time-bin entangled qudits at picosecond resolution.
  • Successfully extended quantum key distribution over a 60 km optical fiber link.
  • Demonstrated dimensionality scaling without compromising the system's repetition rate.

Conclusions:

  • The developed platform enables high-speed manipulation of time-bin entangled qudits, approaching classical telecommunication speeds.
  • This approach offers high quantum information capacity per channel in standard fiber networks.
  • Represents a significant advancement towards efficient, high-data-rate quantum communication systems.