articleNature CommunicationsJan 2, 2025GOLD OA

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

HYHao YuSSStefania SciaraMCMario ChemnitzNMNicola MontautBCBenjamin Crockett

Institut National de la Recherche Scientifique · Leibniz Institute of Photonic Technology · +7 more institutions

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Abstract

High-dimensional photon states (qudits) are pivotal to enhance the information capacity, noise robustness, and data rates of quantum communications. Time-bin entangled qudits are promising candidates for implementing high-dimensional quantum communications over optical fiber networks with processing rates approaching those of classical telecommunications. However, their use is hindered by phase instability, timing inaccuracy, and low scalability of interferometric schemes needed for time-bin processing. As well, increasing the number of time bins per photon state typically requires decreasing the repetition rate of the system, affecting in turn the effective qudit rates. Here, we demonstrate a fiber-pigtailed,…

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Topics & keywords

Topics
Keywords
  • Quantum key distribution
  • Computer science
  • Quantum information science
  • Scalability
  • Quantum channel
  • Bin
  • Photon
  • Interferometry
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