SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 23: Poster II (joint session QI/Q)
QI 23.58: Poster
Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof
Characterization of Polarization Drifts on a Deployed Inter-City Fiber Link for Quantum Communication — •Pritom Paul1,2, Gregor Sauer2,1, Shreya Gouravaram Navalur2,1, and Fabian Steinlechner2,1 — 1Institute of Applied Physics, Friedrich Schiller University Jena, Albert-Einstein-Straße 15, 07745 Jena, Germany. — 2Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Straße 7, 07745, Germany.
Quantum communication involves the transmission of quantum information between two or more distant nodes in a network by encoding it, for example into the polarization state of photons. Such photons can be transmitted to distant nodes via free space or fiber-based links. In our experiment, we use a fiber link to transmit such photons.
The state of polarization of light changes with propagation along an optical fiber. These changes are irregular over time and occur due to perturbations from the environment such as temperature fluctuations throughout the day as well as the actual movement of the fibers. In the end, one must compensate for these polarization changes in order to effectively readout the quantum correlations in the polarization degree of freedom[1]. In this work, we want to understand the different aspects of these polarization changes on a 150km deployed fiber link between Jena and Erfurt in order to develop and improve our existing polarization compensation techniques. We report on the current status of the project.
[1] C.Z. Peng, et.al, Phys. Rev. Lett. 98, 010505(2007).