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Title: Single-photon detection using high-temperature cuprate superconductors

Journal Article · · Nature Nanotechnology
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [5];  [6]; ORCiD logo [6]; ORCiD logo [4]; ORCiD logo [4]
  1. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); University of Zurich (Switzerland)
  2. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); National University of Singapore (Singapore)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  4. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
  5. National Institute of Material Science, Tsukuba (Japan)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States); Yale University, New Haven, CT (United States)

The detection of individual quanta of light is important for quantum computation, fluorescence lifetime imaging, single-molecule detection, remote sensing, correlation spectroscopy, and more. Thanks to their broadband operation, high detection efficiency, exceptional signal-to-noise ratio, and fast recovery times, superconducting nanowire single-photon detectors (SNSPDs) have become a critical component in these applications. The operation of SNSPDs based on conventional superconductors, which have a low critical temperature (Tc), requires costly and bulky cryocoolers. This motivated exploration of other superconducting materials with higher Tc that would enable single-photon detection at elevated temperatures, yet this task has proven exceedingly difficult. Here we show that with proper processing, high-Tc cuprate superconductors can meet this challenge. We fabricated superconducting nanowires (SNWs) out of thin flakes of Bi2Sr2CaCu2O8+δ and La1.55Sr0.45CuO4/La2CuO4 (LSCO-LCO) bilayer films and demonstrated their single-photon response up to 25 and 8 K, respectively. The single-photon operation is revealed through the linear scaling of the photon count rate (PCR) on the radiation power. Both of our cuprate-based SNSPDs exhibited single-photon sensitivity at the technologically-important 1.5 μm telecommunications wavelength. Our work expands the family of superconducting materials for SNSPD technology, opens the prospects of raising the temperature ceiling, and raises important questions about the underlying mechanisms of single-photon detection by unconventional superconductors.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); Gordon and Betty Moore Foundation; Brookhaven Science Associates
Grant/Contract Number:
SC0012704; FA9550-21-1-0319; 1936263; GBMF9463; 030814-00001; GBMF9074
OSTI ID:
1960165
Report Number(s):
BNL-223902-2023-JAAM; TRN: US2312944
Journal Information:
Nature Nanotechnology, Vol. 18, Issue 4; ISSN 1748-3387
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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