SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 8: Quantum Communication I (joint session Q/QI)
QI 8.1: Vortrag
Montag, 6. März 2023, 17:00–17:15, F442
Eavesdropper location inside quantum channel using nonlinear optics — •Alexandra Popp1,2, Birgit Stiller1,2, and Christoph Marquardt1,2 — 1Max Planck Institute for the Science of Light (MPL), Erlangen, Germany. — 2Department of Physics, University of Erlangen-Nürnberg (FAU), Erlangen, Germany.
Secure communictation is highly important in today's information age. Quantum key distribution uses the laws of quantum mechanics to offer secure key exchange between two parties. A key feature of this is the notice of eavesdropping through changes to the quantum bit error rate or excess noise of the quantum channel. Once the eavesdropper is detected, it however needs to be localized and removed from the communication channel. In a quantum channel, this can be especially challenging. We present a novel idea for localizing eavesdroppers on the cm level within quantum as well as classical communication channels using localized acoustic waves created by a correlation-based technique. Amongst other interception techniques, we show that our setup is capable of detecting interception by evanescent outcoupling with as low as 1% outcoupling.