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UID:DSC-20766
DTSTART;TZID=Europe/Berlin:20240430T090000
SEQUENCE:1714455592
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20240430T100000
URL:https://dresden-science-calendar.org/calendar/en/detail/20766
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Charaev: Breaking new ground in quantum detection with SNSPDs: the 
 search for light-mass dark matter and high-critical-temperature supercondu
 ctors
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr. Ilya Charaev\nInstitute of Speaker: University of 
 Zurich\nTopics:\n\n Location:\n  Name: IFW (D2E.27\, IFW Dresden)\n  Stree
 t: Helmholtzstraße 20\n  City: 01069 Dresden\n  Phone: \n  Fax: \nDescrip
 tion: The detection of individual quanta of light is important for quantum
  computation\, fluorescence life-time imaging\, single-molecule detection\
 , remote sensing\, correlation spectroscopy\, and more. Thanks to their br
 oadband operation\, high detection efficiency\, exceptional signal-tonoise
  ratio\, and fast recovery times\, superconducting nanowire single-photon 
 detectors (SNSPDs) have become a critical component in these applications.
   Initially developed for deep-space communication and quantum information
  science\, SNSPDs possess specific characteristics that make them particul
 arly suited for detecting light dark matter(DM). A detector's ability to h
 ave minimal intrinsic false counts (on the order of 1 or fewer counts per 
 day)\, and sensitivity to low-photon-energy (infrared) ranges are all crit
 ical factors. SNSPDs are the most advanced detectors in all three metrics\
 , with ample room for improvement. Although these detectors have already s
 hown promising results\, they require further development before being use
 d in the final designs for a DM experiment. In first part of my talk\, I w
 ill discuss the remaining technological challenges\, design\, and characte
 rization of the devices. The operation of SNSPDs based on conventional sup
 erconductors\, which have a low critical temperature (TC)\, requires costl
 y and bulky cryocoolers. This motivated exploration of other superconducti
 ng materials with higher TC that would enable single-photon detection at e
 levated temperatures\, yet this task has proven exceedingly difficult. Her
 e I show that with proper processing\, high-TC superconductors can meet th
 is challenge. We fabricated superconducting nano- and microwires out of th
 in flakes of Bi2Sr2CaCu2O8+&amp\;amp\;#948\;\, thin MgB2 films and La1.55S
 r0.45CuO4/La2CuO4 (LSCO-LCO) bilayer films and demonstrated their singleph
 oton response up to 25\, 20 and 8 K\, respectively. The single-photon oper
 ation is revealed through the linear scaling of the photon count rate (PCR
 ) on the radiation power. High-TC based SNSPDs exhibited single-photon sen
 sitivity at the technologically important 1.55 Mikrometer telecommunicatio
 ns wavelength. This demonstration expands the family of superconducting ma
 terials for SNSPD technique\, opens the prospects of raising the temperatu
 re ceiling\, and raises important questions about the underlying mechanism
 s of single-photon detection by unconventional superconductors.
DTSTAMP:20260407T133022Z
CREATED:20240409T053652Z
LAST-MODIFIED:20240430T053952Z
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