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Photon number dependent afterpulsing in superconducting nanostrip single-photon detectors

Raupach, Sebastian and Sidorova, Maria and Semenov, Alexey (2023) Photon number dependent afterpulsing in superconducting nanostrip single-photon detectors. Physical Review B, 108, e054507. American Physical Society. doi: 10.1103/PhysRevB.108.054507. ISSN 2469-9950.

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Abstract

Superconducting nanostrip single-photon detectors (SNSPDs) are widespread tools in photonic quantum technologies. Here, we study the afterpulsing phenomenon in commercial SNSPDs exhibiting significant levels of afterpulses even at low counting rates. We find different contributions, where the probability of an afterpulse is not a constant but depends on the mean number of photons per light pulse including mean numbers much less than 1. Our observations exclude the electrical circuit as the primary cause of the main contribution to the observed afterpulsing probability, which exhibits a strong dependence on mean photon number. We propose a phenomenological model that qualitatively explains our findings via the introduction of slowly relaxing “afterpulsing centers,” storing the absorbed photons’ energy for several tens of nanoseconds. We conjecture that two-level systems in amorphous materials are physical candidates for the role of such afterpulsing centers.

Item URL in elib:https://elib.dlr.de/199639/
Document Type:Article
Title:Photon number dependent afterpulsing in superconducting nanostrip single-photon detectors
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Raupach, SebastianPTB BraunschweigUNSPECIFIEDUNSPECIFIED
Sidorova, MariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Semenov, AlexeyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:10 August 2023
Journal or Publication Title:Physical Review B
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:108
DOI:10.1103/PhysRevB.108.054507
Page Range:e054507
Publisher:American Physical Society
ISSN:2469-9950
Status:Published
Keywords:superconducting single-photon detectors, afterpulsing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Detectors for optical instruments
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:24 Nov 2023 09:11
Last Modified:29 Nov 2023 14:42

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