SAMOP 2023 – scientific programme
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QI: Fachverband Quanteninformation
QI 23: Poster II (joint session QI/Q)
QI 23.60: Poster
Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof
A quantum frequency converter for the connection of Rb atoms in a cavity over long distances — •Maya Büki, Emanuele Distante, and Gerhard Rempe — Max-Planck-Institute für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching
Rubidium atoms in a cavity are a promising platform for realizing long-distance quantum networks as the atomic ground states can be efficiently entangled with optical photons [1]. However, photons entangled with Rb atoms are typically at a wavelength (λRb=780 nm) which is unfavourable for long-distance communication due to intrinsic fiber losses in this regime. To efficiently transport the quantum information encoded in optical polarisation qubits over long distances, a wavelength conversion to the telecom regime (λ=1460−1565 nm) is necessary.
Here, we demonstrate such a polarisation conserving quantum frequency converter (QFC) in a Sagnac configuration [2] and investigate the possibilities of increasing the signal-to-noise ratio (SNR) by choosing a suitable final wavelength.
Provided a good SNR and high fidelities, the QFC represents one of the many necessary building blocks to establish a long distance quantum network. Furthermore, it can be used to connect diverse platforms operating at different wavelengths, thus forming a hybrid quantum network which takes advantage of the specific capability of each system.
[1] A. Reiserer, G. Rempe, Rev. Mod. Phys. 87, 1379 (2015).
[2] R. Ikuta et al., Nat. Commun. 9, 1997 (2018).