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Time-dependent POVM reconstruction for single-photon avalanche photo diodes using adaptive regularization

Fitzke, Erik ; Krebs, Robin ; Haase, Thorsten ; Mengler, Max ; Alber, Gernot ; Walther, Thomas (2022)
Time-dependent POVM reconstruction for single-photon avalanche photo diodes using adaptive regularization.
In: New Journal of Physics, 24 (2)
doi: 10.1088/1367-2630/ac5004
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

We report on the first realization of time-dependent quantum detector tomography for commercially available InGaAs avalanche photo detectors. For the construction of appropriate time-dependent POVMs from experimentally measured data, we introduce a novel scheme to calculate the weight of the regularization term based on the amount of measured data. We compare our POVM-based results with the theoretical predictions of the previously developed model by Gouzien et al (2018 Phys. Rev. A 98 013833). In contrast to our measurement-based construction of a time-dependent POVM for photon detectors, this previous investigation extends a time-independent POVM to a time-dependent one by including effects of detector timing jitter and dead time on the basis of particular model assumptions concerning the inner physical mechanisms of a photon detector. Our experimental results demonstrate that this latter approach is not sufficient to completely describe the observable properties of our InGaAs avalanche photo detectors. Thus, constructing the time-dependent POVM of a detector by direct quantum tomographic measurements can reveal information about the detector's interior that may not easily be included in time-independent POVMs by a priori model assumptions.

Typ des Eintrags: Artikel
Erschienen: 2022
Autor(en): Fitzke, Erik ; Krebs, Robin ; Haase, Thorsten ; Mengler, Max ; Alber, Gernot ; Walther, Thomas
Art des Eintrags: Bibliographie
Titel: Time-dependent POVM reconstruction for single-photon avalanche photo diodes using adaptive regularization
Sprache: Englisch
Publikationsjahr: 18 Februar 2022
Verlag: IOP Publishing
Titel der Zeitschrift, Zeitung oder Schriftenreihe: New Journal of Physics
Jahrgang/Volume einer Zeitschrift: 24
(Heft-)Nummer: 2
DOI: 10.1088/1367-2630/ac5004
URL / URN: https://iopscience.iop.org/article/10.1088/1367-2630/ac5004
Kurzbeschreibung (Abstract):

We report on the first realization of time-dependent quantum detector tomography for commercially available InGaAs avalanche photo detectors. For the construction of appropriate time-dependent POVMs from experimentally measured data, we introduce a novel scheme to calculate the weight of the regularization term based on the amount of measured data. We compare our POVM-based results with the theoretical predictions of the previously developed model by Gouzien et al (2018 Phys. Rev. A 98 013833). In contrast to our measurement-based construction of a time-dependent POVM for photon detectors, this previous investigation extends a time-independent POVM to a time-dependent one by including effects of detector timing jitter and dead time on the basis of particular model assumptions concerning the inner physical mechanisms of a photon detector. Our experimental results demonstrate that this latter approach is not sufficient to completely describe the observable properties of our InGaAs avalanche photo detectors. Thus, constructing the time-dependent POVM of a detector by direct quantum tomographic measurements can reveal information about the detector's interior that may not easily be included in time-independent POVMs by a priori model assumptions.

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Erstveröffentlichung

Fachbereich(e)/-gebiet(e): 20 Fachbereich Informatik
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DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche
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Profilbereiche > Cybersicherheit (CYSEC)
05 Fachbereich Physik
05 Fachbereich Physik > Institut für Angewandte Physik
05 Fachbereich Physik > Institut für Angewandte Physik > Laser und Quantenoptik
05 Fachbereich Physik > Institut für Angewandte Physik > Theoretische Quantenphysik
DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1119: CROSSING – Kryptographiebasierte Sicherheitslösungen als Grundlage für Vertrauen in heutigen und zukünftigen IT-Systemen
Hinterlegungsdatum: 02 Mär 2022 09:09
Letzte Änderung: 04 Apr 2023 08:47
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