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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
Article, Bibliographie

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.

Item Type: Article
Erschienen: 2022
Creators: Fitzke, Erik ; Krebs, Robin ; Haase, Thorsten ; Mengler, Max ; Alber, Gernot ; Walther, Thomas
Type of entry: Bibliographie
Title: Time-dependent POVM reconstruction for single-photon avalanche photo diodes using adaptive regularization
Language: English
Date: 18 February 2022
Publisher: IOP Publishing
Journal or Publication Title: New Journal of Physics
Volume of the journal: 24
Issue Number: 2
DOI: 10.1088/1367-2630/ac5004
URL / URN: https://iopscience.iop.org/article/10.1088/1367-2630/ac5004
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.

Uncontrolled Keywords: Primitives, P4
Additional Information:

Erstveröffentlichung

Divisions: 20 Department of Computer Science
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
Profile Areas
Profile Areas > Cybersecurity (CYSEC)
05 Department of Physics
05 Department of Physics > Institute of Applied Physics
05 Department of Physics > Institute of Applied Physics > Laser und Quantenoptik
05 Department of Physics > Institute of Applied Physics > Theoretical Quantum Physics Group
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1119: CROSSING – Cryptography-Based Security Solutions: Enabling Trust in New and Next Generation Computing Environments
Date Deposited: 02 Mar 2022 09:09
Last Modified: 04 Apr 2023 08:47
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