Entanglement between a Diamond Spin Qubit and a Photonic Time-Bin Qubit at Telecom Wavelength
Anna Tchebotareva (TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/General, TNO)
Sophie L.N. Hermans (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QID/Hanson Lab)
Peter C. Humphreys (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab, Kavli institute of nanoscience Delft)
Dirk Voigt (TU Delft - QuTech Advanced Research Centre, TNO, TU Delft - Business Development)
Peter J. Harmsma (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab, TNO)
Lun K. Cheng (TNO)
Ad L. Verlaan (TNO)
Niels Dijkhuizen (TNO)
Wim De Jong (TNO)
Anaïs Dréau (TU Delft - QID/Hanson Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, Université de Montpellier)
Ronald Hanson (TU Delft - QN/Hanson Lab, Kavli institute of nanoscience Delft, TU Delft - QID/Hanson Lab, TU Delft - QuTech Advanced Research Centre)
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Abstract
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.