Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Quantum Communication IV
Q 31.6: Vortrag
Mittwoch, 13. März 2024, 12:15–12:30, HS 3219
Towards polarization entanglement distribution in a metropolitan dark-fibre network in Berlin — •William Staunton1, Sebastian Brauner2, Kai-Hong Luo2, Harald Herrmann2, and Oliver Benson1 — 1Humboldt University, Berlin, Germany — 2Paderborn University, Paderborn, Germany
Efficient distribution of entanglement is essential in the potential realization of a quantum internet[1]. Thanks to the maturity of the classical telecommunications industry, a worldwide network of single-mode optical optical fibres is already in existence. With such an infrastructure and quantum repeater functionalities we could move towards distributed quantum computation and quantum communication on a global scale. We present the work towards polarization entanglement distribution in a metropolitan, field-installed dark-fibre network in Berlin. With focus on results of the active polarization stabilization employed. We also introduce the novel, degenerate, resonant, type-II periodically poled Lithium Niobate (PPLN) spontaneous parametric down-conversion (SPDC) waveguide source[2] producing entangled photon pairs with high brightness and narrow linewidth. Crucially, such sources emit photons with pure spectral states. With an emission bandwidth optimized for interacting with quantum memories, we show how the source is optimized for quantum repeater demonstrations. [1] Kimble, H. J. (2008). The quantum internet. Nature, 453(7198), 1023*1030. [2] K.-H. Luo et al., Phys. Rev. Lett. 115, 200401 (2015).
Keywords: Quantum repeater; SPDC; PPLN; Polarisation stabilisation; Fiber