Supporting data for Entanglement between a Diamond Spin Qubit and a Photonic Time-Bin Qubit at Telecom Wavelength

  • Anna Tchebotareva (Creator)
  • Sophie Hermans (Creator)
  • R. Hanson (Creator)
  • L.K. Cheng (Contributor)
  • Wim De Jong (Contributor)
  • Niels Dijkhuizen (Contributor)
  • Anaïs Dréau (Contributor)
  • Peter Harmsma (Contributor)
  • Peter Humphreys (Contributor)
  • Ad L. Verlaan (Contributor)
  • Dirk Voigt (Contributor)



We report on the realization and verification of quantum entanglement between a nitrogen-vacancy electron spin qubit and a telecom-band photonic qubit. First we generate entanglement between the spin qubit and a 637 nm photonic time-bin qubit, followed by photonic quantum frequency conversion that transfers the entanglement to a 1588 nm photon. We characterize the resulting state by correlation measurements in different bases and find a lower bound to the Bell state fidelity of ≥0.77±0.03. This result presents an important step towards extending quantum networks via optical fiber infrastructure.
Date made available30 Apr 2020
PublisherTU Delft - 4TU.ResearchData
Date of data production5 Aug 2019 -

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