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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Information II

Q 60.4: Poster

Thursday, March 17, 2022, 16:30–18:30, P

Time-dependent single photon detector tomography — •Maximilian Mengler, Erik Fitzke, Robin Krebs, Thorsten Haase, Gernot Alber, and Thomas Walther — TU Darmstadt, Institute for Applied Physics, 64289 Darmstadt

Many modern applications in quantum physics depend on the usage of single photon detectors. Especially for quantum key distribution a detailed understanding of the detector's reaction to certain input states is important. We present an experimental setup to perform time dependent detector tomography, to obtain time-dependent POVMs as a general way of describing the detector's behavior. We used coherent states of known mean photon numbers as a set of known input states to implement the tomography. Finally, we present results regarding timing jitter and detector efficiency for multiple single photon avalanche detectors.