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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 Hägele11Ruhr 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.

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