Project Presentations

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Project Presentations

• Alexander Korneev
• Moscow State Pedagogical University

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Agenda / content

• Organization structure
• Our activity and experience
• Superconducting ultrathin film fabrication and
  processing
• Superconducting single-photon detectors (SSPD)?
• Hot-electron bolometers (HEB) and HEB mixers
• Proposed projects

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Organization infrastructure
Moscow State Pedagogical University (MSPU)?
- A leading Russian teacher-training University
Department of Physics
Research and Educational Radiophysics Center
(RERC)?
- Education (higher education, PhD students,
postdoctoral education)? - Scientific research on
thin superconducting films and nano-scale
superconducting devices
"Superconducting Nanotechnology" company (a
spin-off of RERC)? - Development and fabrication
of commercial products utilizing results of the
scientific research of RERC
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Fabrication of ultrathin super-conducting films
Several atom layers thick films with electrical
and thermal properties close to those of bulk
materials.
Materials Nb, NbN, NbTiN, Ti, MoRe
- DC reactive magnetron sputtering - E-beam
evaporation
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Patterning of nano-scale ultra-sensitive and
ultra-fast devices
High resolution e-beam lithography enables
spatial resolution of several nanometers
Superconducting Single Photon Detector (SSPD) for
infrared range 100-nm-wide superconducting
meander-shaped strip covering 10 mm x 10 mm
THz range superconducting Hot-electron bolometer
(HEB) mixer integrated with planar
antenna planar size of the sensitive element is
50 - 100 nm
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Superconducting Single-Photon Detector (SSPD)?
Wavelength range visible - 5.6 mm Quantum
efficiency 30 at 1300 nm 15 at 1550 nm 0.1
at 5600 nm Dark counts rate 0.1 s-1 Timing
jitter 20 ps Counting rate 100 MHz Coupling to
single-mode optical fibers
Under development - Photon-number resolving SSPD
(resolution above 10 photons)? - Integration with
optical cavities to increase quantum efficiency -
SSPD arrays
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Applications of SSPD
Already found applications - Quantum
cryptography - Optical communication -
Time-correlated study of single-photon emission
from quantum dots - Very large scale integrated
circuits testing by picosecond imaging circuit
analisys Proposed applications - Quantum
optical coherent tomography
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Hot Electron Bolometer (HEB) andHEB mixer
Characteristics - NEP10-13 WHz-0.5 - t30 ps -
Min pulse energy10-19 J Mixer
characteristics TnDSB700K_at_2.5 THz (11
hf/2k)? Gain bandwidth6 GHz LO requirement down
to 100 nW
Already found Applications - radioastronomy
observations - upper atmosphere sensing for trace
gazes Proposed Applications - THz
communications - THz imaging
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Project 1 Quantum cryptography
with SSPD
Laboratory experiment - 200 km link - high bit
rate (outperforms APD)? - improved security with
PNR SSPD
H. Takesue, S. W. Nam, et. al.Quantum key
distribution over a 40-dB channel loss using
superconducting single-photon detectors, Nature
photonics, Vol.1., 343-348, June, 2007
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Project 2 Unamplified long-distance optical
communication
with SSPD
Traditional link - 10-11 bit error rate (BER)? -
105 photons per 1 optical pulse
SSPD link - the same BER with 30 photons per
pulse - no optical amplifiers
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Project 3 Single-photon source characterization
with SSPD
- Time-resolved characterization of quantum dot
emission - IR wavelength rage - Timescale
resolution better than for APD
Korneev, A. et al., Selected Topics in Quantum
Electronics, IEEE Journal of Volume 13, Issue 4,.
2007 Page(s)944 951
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Project 4 Quantum Optical Coherent Tomography
with SSPD
To replace APD in QOCT scheme and to demonstrate
an improved performance - lower acquisition
time - higher spatial resolution
Figure from M.Nasr, et al, Phys Rev Lett, 91
(2003)?
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Project 5 THz imaging
with HEB
THz imaging with HEB mixer - better noise
equivalent thermal differency, - lower image
acquisition time, - passive imaging
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Thank you

• Alexander Korneev
• Moscow State Pedagogical University
• akorneev_at_rplab.ru