Hannover 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Hannover musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 39: Posters: Quantum Optics and Photonics III
Q 39.39: Poster
Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof
Ensuring the privacy of random numbers generated by quantum processes — •Johannes Seiler1, Thomas Strohm2, and Wolfgang P. Schleich1,3 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQ ST ), Universität Ulm, D-89069 Ulm,Germany — 2Corporate Research, Robert Bosch GmbH, D-71272 Renningen, Germany — 3Institute of Quantum Technologies, German Aerospace Center (DLR), Söflinger Str. 100, D-89077 Ulm, Germany
An important advantage of a quantum random number generator (QRNG), compared to its classical counterparts, is that quantum mechanics ensures that the generated random numbers are, even in principle, not predictable by an attacker. Unfortunately, real life implementations of QRNGs usually suffer from imperfections that theoretically open the door for an attacker to get at least partial information about the generated numbers. However, if we know how much information an attacker can have maximally gained, postprocessing of the raw data allows to secure the privacy of the random numbers. The task is therefore to obtain an upper bound on this information. We discuss this problem for a realistic QRNG by modeling the random number generator and its environment. As a result, we prove that the information accessible to the attacker crucially depends on the entanglement between the state of the QRNG and its environment. Moreover, we take into account the effects of imperfect measurements. Finally, we provide a scheme that allows us to calculate an upper bound for the accessible information, without any further knowledge of the state.