Zugriffsnummer 54882
Dokumenttyp Zeitschriftenartikel
Peer Review mit Peer Review
Sprache Englisch
Titel Revealing hidden states in quantum dot array dynamics: quantum polyspectra versus waiting time analysis
Autor(in); Institution
Sifft, Markus; Ruhr University Bochum, Faculty of Physics and Astronomy, Experimental Physics VI (AG), Bochum, GERMANY
Bayer, Johannes Christian; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig; QTZ, Quantentechnologie - Kompetenzzentrum, PTB-Braunschweig; Leibniz Universität Hannover, Institut für Festkörperphysik, Hannover, GERMANY
Hägele, Daniel; Ruhr University Bochum, Faculty of Physics and Astronomy, Experimental Physics VI (AG), Bochum, GERMANY
Haug, Rolf J.; Leibniz Universität Hannover, Institut für Festkörperphysik, Hannover, GERMANY
Quelle/Jahr Physical Review B: 111 (2025), 20, 205412-1 - 205412-13
Artikelnummer 205412
ISSN 2469-9969
DOI
Verlag Ridge, NY: American Physical Society
Zusammenfassung Quantum dots (QDs) are pivotal for the development of quantum technologies, with applications ranging from single-photon sources for secure communication to quantum computing infrastructures. Understanding the electron dynamics within these QDs is essential for characterizing their properties and functionality. Here, we show how by virtue of the recently introduced quantum polyspectral analysis of transport measurements, the complex transport measurements of multi-electron QD systems can be analyzed. This method directly relates higher-order temporal correlations of a raw quantum point contact (QPC) current measurement to the Liouvillian of the measured quantum system. By applying this method to the two-level switching dynamics of a double QD system, we reveal a hidden third state, without relying on the identification of quantum jumps or prior assumptions about the number of involved quantum states. We show that the statistics of the QPC current measurement can identically be described by different three-state Markov models, each with significantly different transition rates. Furthermore, we compare our method to a traditional analysis via waiting-time distributions for which we prove that the statistics of a three-state Markov model is fully described without multitime waiting-time distributions even in the case of two-level switching dynamics. Both methods yield the same parameters with a similar accuracy. The quantum polyspectra method, however, stays applicable in scenarios with low signal-to-noise, where the traditional full counting statistics falters. Our approach challenges previous assumptions and models, offering a more nuanced understanding of QD dynamics and paving the way for the optimization of quantum devices.
Themenbereich der Metrologie Elektrizität und Magnetismus
Förderinformationen (1) Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829
Förderer ID Typ: ISNI
Förderprogramm: Germany's excellence strategy
Titel der Förderung: EXC 2123 - Quantum Frontiers
Förderungsnummer: 341960391
URI der Förderung: https://www.quantumfrontiers.de/en/
Förderinformationen (2) Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829
Förderer ID Typ: ISNI
Förderungsnummer: 510607185 (D.H.)
Förderinformationen (3) Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829
Förderer ID Typ: ISNI
Förderprogramm: Germany's excellence strategy EXC 2123
Titel der Förderung: Quantum Frontiers
Förderungsnummer: 390837967
URI der Förderung: https://www.quantumfrontiers.de/en/
Förderinformationen (4) Förderername: Land Niedersachsen
Förderer ID: 0000 0004 0427 6733
Förderer ID Typ: ISNI

Zitierung

Sifft, M., Bayer, J. C., Hägele, D., & Haug, R. J. (2025). Revealing hidden states in quantum dot array dynamics: quantum polyspectra versus waiting time analysis. Physical Review B, 111(20), 205412-1–205412-13. https://doi.org/10.1103/PhysRevB.111.205412

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