SAMOP 2021 – scientific programme

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QI: Fachverband Quanteninformation

QI 7: Quantum Information: Applications

QI 7.6: Talk

Wednesday, September 22, 2021, 12:00–12:15, H4

Quantum polyspectra for modeling and evaluating quantum measurements: A unifying approach to the strong and weak measurement regime — •Markus Sifft¹, Annika Kurzmann², Jens Kerski², Rüdiger Schott³, Arne Ludwig³, Andreas D. Wieck³, Axel Lorke², Martin Geller², and Daniel Hägele¹ — ¹Ruhr University Bochum, Faculty of Physics and Astronomy, Experimental Physics VI (AG), Germany — ²Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany — ³Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, D-44780 Bochum, Germany

Quantum polyspectra of up to fourth order are introduced for modeling and evaluating quantum measurements. As an example, experimental time-traces of the occupation dynamics of a single quantum dot are evaluated via simultaneously fitting their 2nd-, 3rd-, and 4th-order spectra. Moreover, the evaluation of time-traces via quantum polyspectra is demonstrated to be feasible also in the weak measurement regime even when quantum jumps can no longer be identified from time-traces and methods related to the full counting statistics cease to be applicable. Quantum polyspectra thus constitute a unifying approach to the strong and weak regime of quantum mea- surements in general with possible applications in diverse fields as nano-electronic, circuit quantum electrodynamics, spin noise spectroscopy, or quantum optics.