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Author Hovenier J.N.; Adam A.J.L.; Kašalynas I.; Gao J.R.; Klaassen T.O.; Baryshev A.; Williams B.S.; Kumar S.; Hu Q.; Reno J.L. openurl 
  Title Phase-locking on the beat signal of a two-mode 2.7 terahertz metal-metal quantum cascade laser Type Conference Article
  Year 2006 Publication Proc. Symp. IEEE/LEOS Benelux Chapter Abbreviated Journal  
  Volume Issue Pages (up) 125-128  
  Keywords  
  Abstract We have studied the linewidth and phase-locking of a 2.7 THz quantum cascade laser by using a superconducting bolometer mixer. The 8 GHz beat signal is compared with a microwave reference with a feedback to the laser bias current. Phase locking has been demonstrated, resulting in an extremely narrow beat linewidth of less than 10 Hz. Under frequency-stabilization conditions we find that the line profile is virtually Lorentzian with a long-term minimum linewidth of the THz modes of about 6.3 kHz. Temperature dependent measurements suggestthat this linewidthdoes not approach the Schawlow-Townes limit.  
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  Call Number RPLAB @ atomics90 @ Serial 968  
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Author Maslennikov, S. N.; Finkel, M. I.; Antipov, S. V.; Polyakov, S. L.; Zhang, W.; Ozhegov, R.; Vachtomin, Yu. B.; Svechnikov, S. I.; Smirnov, K. V.; Korotetskaya, Yu. P.; Kaurova, N. S.; Gol'tsman, G. N.; Voronov, B. M. url  openurl
  Title Spiral antenna coupled and directly coupled NbN HEB mixers in the frequency range from 1 to 70 THz Type Conference Article
  Year 2006 Publication Proc. 17th Int. Symp. Space Terahertz Technol. Abbreviated Journal Proc. 17th Int. Symp. Space Terahertz Technol.  
  Volume Issue Pages (up) 177-179  
  Keywords directly coupled NbN HEB mixers  
  Abstract We investigate both antenna coupled and directly coupled HEB mixers at several LO frequencies within the range of 2.5 THz to 70 THz. H20 (2.5+10.7 THz), and CO2 (30 THz) gas discharge lasers are used as the local oscillators. The noise temperature of antenna coupled mixers is measured at LO frequencies of 2.5 THz, 3.8 THz, and 30 THz. The results for both antenna coupled and directly coupled mixer types are compared. The devices with in—plane dimensions of 5x5 ,um 2 are pumped by LO radiation at 10.7 THz. The directly coupled HEB demonstrates nearly flat dependence of responsivity on frequency in the range of 25+64 THz.  
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  Publisher Place of Publication Paris, France Editor  
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  Notes Approved no  
  Call Number Serial 386  
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Author Goltsman, G. N. url  doi
openurl 
  Title Submillimeter superconducting receivers for astronomy, atmospheric studies and other applications Type Abstract
  Year 2006 Publication 31nd IRMW / 14th ICTE Abbreviated Journal 31nd IRMW / 14th ICTE  
  Volume Issue Pages (up) 177  
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  Area Expedition Conference Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics  
  Notes Approved no  
  Call Number Serial 1443  
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Author Gao, J. R.; Hajenius, M.; Tichelaar, F. D.; Voronov, B.; Grishina, E.; Klapwijk, T. M.; Gol'tsman, G.; Zorman, C. A. url  openurl
  Title Can NbN films on 3C-SiC/Si change the IF bandwidth of hot electron bolometer mixers? Type Conference Article
  Year 2006 Publication Proc. 17th Int. Symp. Space Terahertz Technol. Abbreviated Journal Proc. 17th Int. Symp. Space Terahertz Technol.  
  Volume Issue Pages (up) 187-189  
  Keywords NbN HEB mixers  
  Abstract We realized ultra thin NbN films sputtered grown on a 3C-SiC/Si substrate. The film with a thickness of 3.5-4.5 nm shows a 1', of 11.8 K, which is the highest I`, observed among ultra thin NbN films on different substrates. The high-resolution transmission electron microscopy (HRTEM) studies show that the film has a monocrystalline structure, confirming the epitaxial growth on the 3C-SiC. Based on a two-temperature model and input parameters from standard NbN films on Si, simulations predict that the new film can increase the IF bandwidth of a HEB mixer by about a factor of 2 in comparison to the standard films. In addition, we find standard NbN films on Si with a T c of 9.4 K have a thickness of around 5.5 nm, being thicker than expected (3.5 nm).  
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  Notes Approved no  
  Call Number Serial 1439  
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Author Gol'tsman, G.; Maslennikov, S.; Finkel, M.; Antipov, S.; Kaurova, N.; Grishina, E.; Polyakov, S.; Vachtomin, Y.; Svechnikov, S.; Smirnov, K.; Voronov, B. url  doi
openurl 
  Title Nanostructured ultrathin NbN film as a terahertz hot-electron bolometer mixer Type Conference Article
  Year 2006 Publication Proc. MRS Abbreviated Journal Proc. MRS  
  Volume 935 Issue Pages (up) 210 (1 to 6)  
  Keywords NbN HEB mixers  
  Abstract Planar spiral antenna coupled and directly lens coupled NbN HEB mixer structures are studied. An additional MgO buffer layer between the superconducting film and Si substrate is introduced. The buffer layer enables us to increase the gain bandwidth of a HEB mixer due to better acoustic transparency. The gain bandwidth is widened as NbN film thickness decreases and amounts to 5.2 GHz. The noise temperature of antenna coupled mixer is 1300 and 3100 K at 2.5 and 3.8 THz respectively. The structure and composition of NbN films is investigated by X-ray diffraction spectroscopy methods. Noise performance degradation at LO frequencies more than 3 THz is due to the use of a planar antenna and signal loss in contacts between the antenna and the sensitive NbN bridge. The mixer is reconfigured for operation at higher frequencies in a manner that receiver’s noise temperature is only 2300 K (3 times of quantum limit) at LO frequency of 30 THz.  
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  ISSN 0272-9172 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1440  
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Author McDonald, P.C.; Jaramillo, E.; Baudouy, B. url  doi
openurl 
  Title Thermal design of the CFRP support struts for the spatial framework of the Herschel Space Observatory Type Journal Article
  Year 2006 Publication Cryogenics Abbreviated Journal Cryogenics  
  Volume 46 Issue 4 Pages (up) 298-304  
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  Series Volume Series Issue Edition  
  ISSN 0011-2275 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number RPLAB @ s @ Serial 442  
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Author Yagoubov, P.; Hoogeveen, R.; Torgashin, M.; Khudchenko, A.; Koshelets, V.; Suttiwong, N.; Wagner, G.; Birk M. openurl 
  Title 550-650 GHz spectrometer development for TELIS Type Conference Article
  Year 2006 Publication Proc. 17th Int. Symp. Space Terahertz Technol. Abbreviated Journal  
  Volume Issue Pages (up) 338-341  
  Keywords SIR  
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  Notes Approved no  
  Call Number Serial 528  
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Author Kenyon, M.; Day, P. K.; Bradford, C. M.; Bock, J. J.; Leduc, H. G. openurl 
  Title Background-limited membrane-isolated TES bolometers for far-IR/submillimeter direct-detection spectroscopy Type Journal Article
  Year 2006 Publication Nucl. Instr. & Meth. Phys. Res. A Abbreviated Journal  
  Volume 559 Issue Pages (up) 456-458  
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  Notes Approved no  
  Call Number RPLAB @ s @ TES_NEP_1e_19 Serial 384  
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Author Shitov, Sergey V.; Vystavkin, Alexander N. openurl 
  Title A design analysis of imaging radiometer with antenna-coupled transition-edge sensors Type Journal Article
  Year 2006 Publication Nuclear Instruments and Methods in Physics Research A Abbreviated Journal  
  Volume 559 Issue Pages (up) 503-505  
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  Notes Approved no  
  Call Number RPLAB @ s @ det_imag_radiometer_Shitov Serial 402  
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Author Brown, E. R.; Lee, A. W. M.; Navi, B. S.; Bjarnason, J. E. openurl 
  Title Characterization of a planar self-complementary square-spiral antenna in the THz region Type Journal Article
  Year 2006 Publication Microwave and Optical Technology Letters Abbreviated Journal Microwave Opt Technol Lett  
  Volume 48 Issue 3 Pages (up) 524-529  
  Keywords optical antennas; square spiral antenna; self complementary THz; photomixing; lens; method of moments; geometric optics; physical optics  
  Abstract This paper describes a compact, self-complementary square-spiral antenna on a GaAs substrate with a broadside high-directivity (~9 dB) frequency-independent pattern when coupled through a silicon hyperhemisphere. The driving-point resistance undulates between ~00 and 300Ω from 200 GHz to 1 THz—much higher than the 72Ω value from Booker's modified formula, but quite beneficial for coupling to high-impedance broadband devices  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 736  
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Author Rosfjord, Kristine M.; Yang, Joel K. W.; Dauler, Eric A.; Kerman, Andrew J.; Vikas Anant; Voronov, Boris M.; Gol'tsman, Gregory N.; Berggren, Karl K. url  doi
openurl 
  Title Nanowire Single-photon detector with an integrated optical cavity and anti-reflection coating Type Journal Article
  Year 2006 Publication Opt. Express Abbreviated Journal Opt. Express  
  Volume 14 Issue 2 Pages (up) 527-534  
  Keywords SSPD, SNSPD, cavity  
  Abstract We have fabricated and tested superconducting single-photon detectors and demonstrated detection efficiencies of 57% at 1550-nm wavelength and 67% at 1064 nm. In addition to the peak detection efficiency, a median detection efficiency of 47.7% was measured over 132 devices at 1550 nm. These measurements were made at 1.8K, with each device biased to 97.5% of its critical current. The high detection efficiencies resulted from the addition of an optical cavity and anti-reflection coating to a nanowire photodetector, creating an integrated nanoelectrophotonic device with enhanced performance relative to the original device. Here, the testing apparatus and the fabrication process are presented. The detection efficiency of devices before and after the addition of optical elements is also reported.  
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  ISSN 1094-4087 ISBN Medium  
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  Notes PMID:19503367 Approved no  
  Call Number Serial 388  
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Author Koshelets, V. P.; Khudchenko, A. V. openurl 
  Title Analysis of spectral characteristics of a superconducting integrated receiver Type Journal Article
  Year 2006 Publication J. Communications Technol. Electron. Abbreviated Journal  
  Volume 51 Issue 5 Pages (up) 596-603  
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  Notes Approved no  
  Call Number RPLAB @ s @ mix_SIR Serial 400  
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Author Koshelets, V. P.; Khudchenko, A. V. url  doi
openurl 
  Title Analysis of spectral characteristics of a superconducting integrated receiver Type Journal Article
  Year 2006 Publication J. Communications Technol. Electron. Abbreviated Journal  
  Volume 51 Issue 5 Pages (up) 596-603  
  Keywords SIR  
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  Series Volume Series Issue Edition  
  ISSN 1064-2269 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 526  
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Author Zhang, Qiang; Goebel, Alexander; Wagenknecht, Claudia; Chen, Yu-Ao; Zhao, Bo; Yang, Tao; Mair, Alois; Schmiedmayer, Jörg; Pan, Jian-Wei openurl 
  Title Experimental quantum teleportation of a two-qubit composite system Type Journal Article
  Year 2006 Publication Nature Physics Abbreviated Journal Nat. Phys.  
  Volume 2 Issue 10 Pages (up) 678-682  
  Keywords fromIPMRAS; quantum teleportation  
  Abstract Quantum teleportation, a way to transfer the state of a quantum system from one location to another, is central to quantum communication and plays an important role in a number of quantum computation protocols. Previous experimental demonstrations have been implemented with single photonic or ionic qubits. However, teleportation of single qubits is insufficient for a large-scale realization of quantum communication and computation. Here, we present the experimental realization of quantum teleportation of a two-qubit composite system. In the experiment, we develop and exploit a six-photon interferometer to teleport an arbitrary polarization state of two photons. The observed teleportation fidelities for different initial states are all well beyond the state estimation limit of 0.40 for a two-qubit system. Not only does our six-photon interferometer provide an important step towards teleportation of a complex system, it will also enable future experimental investigations on a number of fundamental quantum communication and computation protocols  
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  Call Number RPLAB @ gujma @ Serial 795  
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Author Smirnov, K.; Korneev, A.; Minaeva, O.; Divochij, A.; Rubtsova, I.; Antipov, A.; Ryabchun, S.; Okunev, O.; Milostnaya, I.; Chulkova, G.; Voronov, B.; Kaurova, N.; Seleznev, V.; Korotetskaya, Y.; Gol’tsman, G. url  doi
openurl 
  Title Superconducting single-photon detector for near- and middle IR wavelength range Type Conference Article
  Year 2006 Publication Proc. 16th Int. Crimean Microwave and Telecommunication Technology Abbreviated Journal Proc. 16th Int. Crimean Microwave and Telecommunication Technology  
  Volume 2 Issue Pages (up) 684-685  
  Keywords NbN SSPD, SNSPD  
  Abstract Presented in this paper are the results of research of NbN-film superconducting single-photon detector. At 2 K temperature, quantum efficiency in the visible light (0.56 mum) reaches 30-40 %. With the wavelength increase quantum efficiency decreases and comes to  20% at 1.55 mum and  0.02% at 5.6 mum. Minimum dark counts rate is 2times10-4s-1. The jitter of detector is 35 ps. The detector was successfully implemented for integrated circuits non-invasive optical testing. It is also perspective for quantum cryptography systems  
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  Language Russian Summary Language Original Title  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1447  
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