SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 6: Poster I (joint session QI/Q)

QI 6.24: Poster

Monday, March 6, 2023, 16:30–19:00, Empore Lichthof

Dynamic Polarization State Preparation for Single-Photon Quantum Cryptography — •Koray Kaymazlar, Timm Gao, Daniel Vajner, Lucas Rickert, and Tobias Heindel — Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany

Quantum key distribution (QKD) systems using polarization encoding require fast modulation of the polarization states of single-photon pulses. Here, we present a setup for preparing the polarization of single photons dynamically. The system consists of electronics based on a field programmable gate array (FPGA) and a digital to analog converter (DAC) driving a free space electro optic modulator (EOM) with 500 MHz bandwidth. We characterize and optimize the performance of this setup in terms of extinction ratio and repetition rate and discuss its suitability for applications in QKD experiments.