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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. (Publisher's Version)
In: New Journal of Physics, 24 (2), IOP Publishing, e-ISSN 1367-2630,
DOI: 10.26083/tuprints-00020976,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Time-dependent POVM reconstruction for single-photon avalanche photo diodes using adaptive regularization
Language: English
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.

Journal or Publication Title: New Journal of Physics
Volume of the journal: 24
Issue Number: 2
Place of Publication: Darmstadt
Publisher: IOP Publishing
Collation: 16 Seiten
Uncontrolled Keywords: quantum detector tomography, single-photon detector, avalanche photo diode, quantum communication, timing jitter, time-dependent POVM, SPAD
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 05 Department of Physics > Institute of Applied Physics
Date Deposited: 11 Jul 2022 13:42
Last Modified: 08 Sep 2022 08:37
DOI: 10.26083/tuprints-00020976
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-209768
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20976
PPN: 498970159
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