Freiburg 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 31: Quantum Communication IV
Q 31.8: Vortrag
Mittwoch, 13. März 2024, 12:45–13:00, HS 3219
A quantum frequency converter for entanglement distribution across a metropolitan network — •Maya Büki, Gianvito Chiarella, Tobias Frank, Pau Farrerra, Emanuele Distante, and Gerhard Rempe — Max-Planck-Institute for Quantum Optics, Garching, Germany
Single atoms in a cavity serve as a suitable building block for quantum networks as cavities offer an ideal interface between light and matter qubits in terms of both efficiency and fidelity. Within this scope, we can efficiently entangle the spin states of Rubidium (Rb) atoms with optical polarization qubits. Despite offering numerous capabilities for quantum networks, such as being a source of (complex) atom-photon entanglement, enabling heralding quantum memories, and facilitating quantum repeaters, there is a drawback when aiming for long-distance quantum networks, and that is the wavelength of the optical qubit at λRb = 780 nm, causing intrinsic fiber losses to be quite high.
To circumvent these losses, a quantum frequency conversion to the telecom regime becomes necessary. Here, we demonstrate a quantum frequency converter (QFC) that exhibits a good efficiency and high signal-to-noise ratio. Alongside a narrow filtering system this QFC will be employed to connect two quantum nodes through 23km of optical fiber across the metropolitan area of Munich. We will present preliminary results about this fiber channel outside the lab, with the prospect of distributing entanglement across a real world quantum network link.
Keywords: Quantum frequency conversion; Quantum network; Entanglement distribution