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Author Santavicca,D.F.; Reulet,B.; Karasik,B.S.; Pereverzev,S.V.; Olaya, D.; Gershenson, M.E.; Frunzio, L.; Prober, D.E. openurl 
  Title Energy resolution of terahertz single-photon-sensitive bolometric detectors Type Journal Article
  Year 2010 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 96 Issue 8 Pages 083505 - 083505-3  
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  Abstract We report measurements of the energy resolution of ultrasensitive superconducting bolometric detectors. The device is a superconducting titanium nanobridge with niobium contacts. A fast microwave pulse is used to simulate a single higher-frequency photon, where the absorbed energy of the pulse is equal to the photon energy. This technique allows precise calibration of the input coupling and avoids problems with unwanted background photons. Present devices have an intrinsic full-width at half-maximum energy resolution of approximately 23 THz, near the predicted value due to intrinsic thermal fluctuation noise.  
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  Notes Approved no  
  Call Number RPLAB @ akorneev @ Serial 601  
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Author Seki, T.; Shibata, H.; Takesue, H.; Tokura, Y.; Imoto, N. doi  openurl
  Title Comparison of timing jitter between NbN superconducting single-photon detector and avalanche photodiode Type Journal Article
  Year 2010 Publication Phys. C Abbreviated Journal Phys. C  
  Volume 470 Issue 20 Pages 1534-1537  
  Keywords SSPD; APD; jitter  
  Abstract We report the pulse-to-pulse timing jitter measurement of a niobium nitride (NbN) superconducting single-photon detector (SSPD) and an InGaAs avalanche photodiode (APD) at 1550-nm wavelength. A direct comparison of their timing jitter was performed by using the same experimental configuration to measure both detectors. The measured jitter of the SSPD and the APD are 75 and 84 ps at full-width at half-maximum (FWHM), and 138 and 384 ps at full-width at tenth-maximum (FWTM), respectively. The jitter of the SSPD remains small at FWTM while that of APD is wide. We also estimated the transmission distances and secure key generation rates for fiber-based quantum key distribution (QKD) which uses these detectors. The estimated transmission distances of the APD are 86 km and 107 km with respect to 1 ns and 100 ps time windows, respectively, and those of the SSPD are 125 km and 172 km with respect to 1 ns and 100 ps time windows, respectively. This estimation indicates the SSPDЃfs advantages for QKD compared to the APD.  
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  Notes Approved no  
  Call Number RPLAB @ akorneev @ Serial 613  
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Author Жорес Алферов openurl 
  Title Лекции на телеканале Культура. Полупроводниковая революция. Наука и общество. Type Miscellaneous
  Year 2010 Publication Телеканал Культура Abbreviated Journal  
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  Notes Approved no  
  Call Number Serial 622  
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Author Karasik, Boris S.; Cantor, Robin url  openurl
  Title Optical NEP in hot-electron nanobolometers Type Journal Article
  Year 2010 Publication Abbreviated Journal  
  Volume Issue Pages 1-7  
  Keywords HEB, Ti, NEP, femtowatt, SAFARI, SPICA, 650 GHz, 0.65 THz, 460 um, twin slot antenna, SQUID readout  
  Abstract For the first time, we have measured the optical noise equivalent power (NEP) in titanium (Ti) superconducting hot-electron nanobolometers (nano-HEBs). The bolometers were 2{\mu}mx1{\mu}mx20nm and 1{\mu}mx1{\mu}mx20nm planar antenna-coupled devices. The measurements were done at {\lambda} = 460 {\mu}m using a cryogenic black body radiation source delivering optical power from a fraction of a femtowatt to a few 100s of femtowatts. A record low NEP = 3x10^{-19} W/Hz^{1/2} at 50 mK has been achieved. This sensitivity meets the requirements for SAFARI instrument on the SPICA telescope. The ways for further improvement of the nano-HEB detector sensitivity are discussed.  
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  Notes To appear in Proc. 21st Int. Symp. on Spc. THz Technol., Oxford, UK, 23-25 March, 2010 Approved no  
  Call Number Serial 623  
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Author Zhang, W.; Khosropanah, P.; Gao, J. R.; Kollberg, E. L.; Yngvesson, K. S.; Bansal, T.; Barends, R.; Klapwijk, T. M. openurl 
  Title Quantum noise in a terahertz hot electron bolometer mixer Type Journal Article
  Year 2010 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 96 Issue 11 Pages 111113-(1-3)  
  Keywords HEB mixer, quantum limit, quantum noise, vacuum box, THz, Terahertz  
  Abstract We have measured the noise temperature of a single, sensitive superconducting NbN hot electron bolometer (HEB) mixer in a frequency range from 1.6 to 5.3 THz, using a setup with all the key components in vacuum. By analyzing the measured receiver noise temperature using a quantum noise (QN) model for HEB mixers, we confirm the effect of QN. The QN is found to be responsible for about half of the receiver noise at the highest frequency in our measurements. The beta-factor (the quantum efficiency of the HEB) obtained experimentally agrees reasonably well with the calculated value.  
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  Notes Approved no  
  Call Number Serial 624  
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