toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author Peltonen, J. T.; Astafiev, O. V.; Korneeva, Y. P.; Voronov, B. M.; Korneev, A. A.; Charaev, I. M.; Semenov, A. V.; Golt'sman, G. N.; Ioffe, L. B.; Klapwijk, T. M.; Tsai, J. S. url  doi
openurl 
  Title Coherent flux tunneling through NbN nanowires Type Journal Article
  Year 2013 Publication Phys. Rev. B Abbreviated Journal Phys. Rev. B  
  Volume 88 Issue 22 Pages 220506 (1 to 5)  
  Keywords NbN nanowires  
  Abstract We demonstrate evidence of coherent magnetic flux tunneling through superconducting nanowires patterned in a thin highly disordered NbN film. The phenomenon is revealed as a superposition of flux states in a fully metallic superconducting loop with the nanowire acting as an effective tunnel barrier for the magnetic flux, and reproducibly observed in different wires. The flux superposition achieved in the fully metallic NbN rings proves the universality of the phenomenon previously reported for InOx. We perform microwave spectroscopy and study the tunneling amplitude as a function of the wire width, compare the experimental results with theories, and estimate the parameters for existing theoretical models.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title (up) Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1098-0121 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1369  
Permanent link to this record
 

 
Author Shurakov, A.; Tong, C.-Y. E.; Blundell, R.; Kaurova, N.; Voronov, B.; Gol'tsman, G. url  doi
openurl 
  Title Microwave stabilization of a HEB mixer in a pulse-tube cryocooler Type Journal Article
  Year 2013 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal IEEE Trans. Appl. Supercond.  
  Volume 23 Issue 3 Pages 1501504-1501504  
  Keywords NbN HEB mixers  
  Abstract We report the results of our study of the stability of an 800 GHz hot electron bolometer (HEB) mixer cooled with a pulse-tube cryocooler. Pulse-tube cryocoolers introduce temperature fluctuations as well as mechanical vibrations at a frequency of ~1 Hz, both of which can cause receiver gain fluctuations at that frequency. In our system, the motor of the cryocooler was separated from the cryostat to minimize mechanical vibrations, leaving thermal effects as the dominant source of the receiver gain fluctuations. We measured root mean square temperature variations of the 4 K stage of ~7 mK. The HEB mixer was pumped by a solid state local oscillator at 810 GHz. The root mean square current fluctuations at the low noise operating point (1.50 mV, 56.5 μA) were ~0.12 μA, and were predominantly due to thermal fluctuations. To stabilize the bias current, microwave radiation was injected to the HEB mixer. The injected power level was set by a proportional-integral-derivative controller, which completely compensates for the bias current oscillations induced by the pulse-tube cryocooler. Significant improvement in the Allan variance of the receiver output power was obtained, and an Allan time of 5 s was measured.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title (up) Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1051-8223 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1372  
Permanent link to this record
 

 
Author Ryabchun, S.; Smirnov, A.; Pentin, I.; Vakhtomin, Yu.; Smirnov, K.; Kaurova, N.; Voronov, B.; Goltsman, G. url  openurl
  Title Superconducting single photon detector integrated with optical cavity Type Conference Article
  Year 2011 Publication Proc. MLPLIT Abbreviated Journal Proc. MLPLIT  
  Volume Issue Pages 143-145  
  Keywords NbN SSPD, cavity  
  Abstract  
  Address Suzdal / Vladimir (Russia)  
  Corporate Author Thesis  
  Publisher Modern laser physics and laser-information technologies for science and manufacture Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title (up) Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference 1st international russian-chinese conference / youthschool-workshop  
  Notes September 23-28, 2011 Approved no  
  Call Number Serial 1385  
Permanent link to this record
 

 
Author Maslennikova, A.; Larionov, P.; Ryabchun, S.; Smirnov, A.; Pentin, I.; Vakhtomin, Yu.; Smirnov, K.; Kaurova, N.; Voronov, B.; Goltsman, G. url  openurl
  Title Noise equivalent power and dynamic range of NBN hot-electron bolometers Type Conference Article
  Year 2011 Publication Proc. MLPLIT Abbreviated Journal Proc. MLPLIT  
  Volume Issue Pages 146-148  
  Keywords NbN HEB  
  Abstract  
  Address Suzdal / Vladimir (Russia)  
  Corporate Author Thesis  
  Publisher Modern laser physics and laser-information technologies for science and manufacture Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title (up) Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference 1st international russian-chinese conference / youthschool-workshop  
  Notes September 23-28, 2011 Approved no  
  Call Number Serial 1386  
Permanent link to this record
 

 
Author Korneev, A.; Korneeva, Y.; Florya, I.; Voronov, B.; Goltsman, G. url  doi
openurl 
  Title Spectral sensitivity of narrow strip NbN superconducting single-photon detector Type Conference Article
  Year 2011 Publication Proc. SPIE Abbreviated Journal Proc. SPIE  
  Volume 8072 Issue Pages 80720G (1 to 9)  
  Keywords NbN SSPD, SNSPD  
  Abstract Superconducting single-photon detector (SSPD) is patterned from 4-nm-thick NbN film deposited on sapphire substrate as a 100-nm-wide strip. Due to its high detection efficiency, low dark counts, and picosecond timing jitter SSPD has become a competitor to the InGaAs avalanche photodiodes at 1550 nm and longer wavelengths. Although the SSPD is operated at liquid helium temperature its efficient single-mode fibre coupling enabled its usage in many applications ranging from single-photon sources research to quantum cryptography. In our strive to increase the detection efficiency at 1550 nm and longer wavelengths we developed and fabricated SSPD with the strip almost twice narrower compared to the standard 100 nm. To increase the voltage response of the device we utilized cascade switching mechanism: we connected 50-nm-wide and 10-μm-long strips in parallel covering the area of 10 μmx10 μm. Absorption of a photon breaks the superconductivity in a strip leading to the bias current redistribution between other strips followed their cascade switching. As the total current of all the strips about is 1 mA by the order of magnitude the response voltage of such an SSPD is several times higher compared to the traditional meander-shaped SSPDs. In middle infrared (about 3 μm wavelength) these devices have the detection efficiency several times higher compared to the traditional SSPDs.  
  Address  
  Corporate Author Thesis  
  Publisher SPIE Place of Publication Editor Fiurásek, J.; Prochazka, I.  
  Language Summary Language Original Title  
  Series Editor Series Title (up) Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference Photon Counting Applications, Quantum Optics, and Quantum Information Transfer and Processing III  
  Notes Approved no  
  Call Number Serial 1387  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: