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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Information II

Q 60.5: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Simulation of fiber-based quantum key distribution (QKD) with highly entangled states including multi-photon pair effects — •Philipp Kleinpaß, Erik Fitzke, and Thomas Walther — TU Darmstadt, Institute of Applied Physics, 64289 Darmstadt

The security of QKD protocols relies on the fact that a potential eavesdropper reveals its presence by introducing additional errors to the final key. Thus, to ensure a secure key exchange, other errors, namely due to device imperfections within the setup, need to be quantified and minimized, while maintaining a sufficiently high bit rate. Here, a model is presented that may be used to simulate the expected key rates for entanglement-based phase-time coding, considering many important error sources like multi-photon pair creations, chromatic dispersion and interferometer imperfections by employing a phase-space approach. Depending on the entanglement of the states used for the protocol, two methods are discussed, distinguishing between highly entangled states featuring a large number of Schmidt modes and states that may be represented explicitly by their Schmidt decomposition.