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Author Santori, Charles; Beausoleil, Raymond G. openurl 
  Title Quantum memory: Phonons in diamond crystals Type Journal Article
  Year 2012 Publication Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue (up) Pages 10-12  
  Keywords fromIPMRAS  
  Abstract The demonstration that quantum information can be stored in a bulk-diamond crystal in the form of an optically excited phonon gives researchers a new type of mechanical solid-state quantum memory to explore.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 781  
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Author Xu, XinAn; Wong, Chee Wei openurl 
  Title Quantum optics: Correlations on a chip Type Journal Article
  Year 2012 Publication Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue (up) Pages 75-76  
  Keywords fromIPMRAS  
  Abstract Researchers have developed a semiconductor structure capable of supporting quantum correlations between photons and strong single-photon nonlinearities, thus paving the way for the development of chip-based devices for quantum secure communications and quantum information processing.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 782  
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Author Hase, Muneaki; Katsuragawa, Masayuki; Constantinescu, Anca Monia; Petek, Hrvoje openurl 
  Title Frequency comb generation at terahertz frequencies by coherent phonon excitation in silicon Type Journal Article
  Year 2012 Publication Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue (up) Pages 243–247  
  Keywords fromIPMRAS  
  Abstract High-order nonlinear light–matter interactions in gases enable the generation of X-ray and attosecond light pulses, metrology and spectroscopy1. Optical nonlinearities in solid-state materials are particularly interesting for combining optical and electronic functions for high-bandwidth information processing2. Third-order nonlinear optical processes in silicon have been used to process optical signals with bandwidths greater than 1 GHz (ref. 2). However, fundamental physical processes for a silicon-based optical modulator in the terahertz bandwidth range have not yet been explored. Here, we demonstrate ultrafast phononic modulation of the optical index of silicon by irradiation with intense few-cycle femtosecond pulses. The anisotropic reflectivity modulation by the resonant Raman susceptibility at the fundamental frequency of the longitudinal optical phonon of silicon (15.6 THz) generates a frequency comb up to seventh order. All-optical >100 THz frequency comb generation is realized by harnessing the coherent atomic motion of the silicon crystalline lattice at its highest mechanical frequency.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 794  
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Author Mineev, Vladimir P. openurl 
  Title Superfluid helium: Order in disorder Type Journal Article
  Year 2012 Publication Nature Physics Abbreviated Journal Nat. Phys.  
  Volume 8 Issue (up) Pages 253–254  
  Keywords fromIPMRAS  
  Abstract Confining liquid 3He in porous silica aerogel prepared with strong anisotropy stabilizes a state of axial superfluidity.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 810  
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Author Pernice, W.; Schuck, C.; Minaeva, O.; Li, M.; Goltsman, G. N.; Sergienko, A. V.; Tang, H. X. url  openurl
  Title High speed and high efficiency travelling wave single-photon detectors embedded in nanophotonic circuits Type Miscellaneous
  Year 2012 Publication arXiv Abbreviated Journal arXiv  
  Volume 1108.5299 Issue (up) Pages 1-23  
  Keywords optical waveguides, waveguide SSPD, guantum photonics, jitter, detection efficiency  
  Abstract Ultrafast, high quantum efficiency single photon detectors are among the most sought-after elements in modern quantum optics and quantum communication. High photon detection efficiency is essential for scalable measurement-based quantum computation, quantum key distribution, and loophole-free Bell experiments. However, imperfect modal matching and finite photon absorption rates have usually limited the maximum attainable detection efficiency of single photon detectors. Here we demonstrate a superconducting nanowire detector atop nanophotonic waveguides which allows us to drastically increase the absorption length for incoming photons. When operating the detectors close to the critical current we achieve high on-chip single photon detection efficiency up to 91% at telecom wavelengths, with uncertainty dictated by the variation of the waveguide photon flux. We also observe remarkably low dark count rates without significant compromise of detection efficiency. Furthermore, our detectors are fully embedded in a scalable silicon photonic circuit and provide ultrashort timing jitter of 18ps. Exploiting this high temporal resolution we demonstrate ballistic photon transport in silicon ring resonators. The direct implementation of such a detector with high quantum efficiency, high detection speed and low jitter time on chip overcomes a major barrier in integrated quantum photonics.  
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  Notes Approved no  
  Call Number Serial 845  
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Author Shurakov, Alexander; Tong, Edward; Blundell, Raymond; Gol'tsman, Gregory openurl 
  Title Microwave stabilization of HEB mixer by a microchip controller Type Conference Article
  Year 2012 Publication IEEE MTT-S international microwave symposium digest Abbreviated Journal  
  Volume Issue (up) Pages 1-3  
  Keywords HEB mixer stability, microwave injection, Allan variance, Allan time  
  Abstract The stability of a Hot Electron Bolometer (HEB) mixer can be improved by the use of microwave injection. In this article we report a refinement of this approach. We introduce a microchip controller to facilitate the implementation of the stabilization scheme, and demonstrate that the feedback loop effectively suppresses drifts in the HEB bias current, leading to an improvement in the receiver stability. The measured Allan time of the mixer's IF output power is increased to > 10 s.  
  Address Montreal, QC, Canada  
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  Notes Approved no  
  Call Number Serial 857  
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Author Henrich, D.; Dorner,S.; Hofherr, M.; Il'in, K.; Semenov, A.; Heintze, E.; Scheffler, M.; Dressel, M.; Siegel, M. openurl 
  Title Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content Type Journal Article
  Year 2012 Publication Abbreviated Journal J. Appl. Phys.  
  Volume 112 Issue (up) Pages  
  Keywords SSPD, SNSPD, magnetron sputtering, spectrum, NbN film, nitrogen concentration  
  Abstract The spectral detection efficiency and the dark count rate of superconducting nanowire

single-photon detectors (SNSPD) have been studied systematically on detectors made from thin

NbN films with different chemical compositions. Reduction of the nitrogen content in the 4 nm

thick NbN films results in a decrease of the dark count rates more than two orders of magnitude

and in a red shift of the cut-off wavelength of the hot-spot SNSPD response. The observed

phenomena are explained by an improvement of uniformity of NbN films that has been confirmed

by a decrease of resistivity and an increase of the ratio of the measured critical current to the

depairing current. The latter factor is considered as the most crucial for both the cut-off

wavelength and the dark count rates of SNSPD. Based on our results we propose a set of criteria

for material properties to optimize SNSPD in the infrared spectral region. VC 2012 American

Institute of Physics. [http://dx.doi.org/10.1063/1.4757625]		  
  Address  
  Corporate Author D. Henrich, S. Dorner, M. Hofherr, K. Il'in, A. Semenov, E. Heintze, M. Scheffler, M. Dressel, M. Siegel Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content  
  Series Editor Series Title Abbreviated Series Title  
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  Notes Approved no  
  Call Number RPLAB @ seleznev @ Serial 877  
Permanent link to this record
 
 
Author Inderbitzin, K.; Engel, A.; Schilling, A.; Il'in, K.; Siegel, M. openurl 
  Title An ultra-fast superconducting Nb nanowire single-photon detector for soft x-rays Type Journal Article
  Year 2012 Publication Abbreviated Journal Appl. Phys. Lett.  
  Volume 101 Issue (up) Pages  
  Keywords SSPD, SNSPD, x-ray, Nb  
  Abstract Although superconducting nanowire single-photon detectors (SNSPDs) are well studied regarding the

detection of infrared/optical photons and keV-molecules, no studies on continuous x-ray photon

counting by thick-film detectors have been reported so far. We fabricated a 100 nm thick niobium

x-ray SNSPD (an X-SNSPD) and studied its detection capability of photons with keV-energies in

continuous mode. The detector is capable to detect photons even at reduced bias currents of 0.4%,

which is in sharp contrast to optical thin-film SNSPDs. No dark counts were recorded in extended

measurement periods. Strikingly, the signal amplitude distribution depends significantly on the photon

energy spectrum.VC		  
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  Notes Approved no  
  Call Number RPLAB @ seleznev @ Serial 878  
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Author D. Henrich, L. Rehm S. Dörner, M. Hofherr, K. Il'in, A. Semenov, and M. Siegel url  openurl
  Title Detection efficiency of a spiral-nanowire superconducting single-photon detector Type Journal Article
  Year 2012 Publication Abbreviated Journal  
  Volume Issue (up) Pages  
  Keywords Critical current, Nanoscale devices, Superconducting photodetectors.  
  Abstract We investigate the detection efficiency of a spiral layout of a Superconducting Nanowire Single-Photon Detector (SNSPD). The design is less susceptible to the critical current reduction in sharp turns of the nanowire than the conventional meander design. Detector samples with different nanowire width from 300 to 100 nm are patterned from a 4 nm thick NbN film deposited on sapphire substrates. The critical current IC at 4.2 K for spiral, meander, and simple bridge structures is measured and compared. On the 100 nm wide samples, the detection efficiency is measured in the wavelength range 400-1700 nm and the cut-off wavelength of the hot-spot plateau is determined. In the optical range, the spiral detector reaches a detection efficiency of 27.6%, which is ~1.5 times the value of the meander. In the infrared range the detection efficiency is more than doubled.  
  Address  
  Corporate Author D. Henrich, L. Rehm S. Dörner, M. Hofherr, K. Il'in, A. Semenov, and M. Siegel Thesis  
  Publisher Place of Publication Editor  
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  Notes Approved no  
  Call Number RPLAB @ seleznev @ Serial 880  
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Author Julia Toussaint, Roman Grüner, Marco Schubert, Torsten May, Hans-Georg Meyer, Benjamin Dietzek, Jürgen Popp, Matthias Hofherr, Matthias Arndt, Dagmar Henrich, Konstantin Il'in, and Michael Siegel openurl 
  Title Superconducting single-photon counting system for optical experiments requiring time-resolution in the picosecond range Type Journal Article
  Year 2012 Publication Abbreviated Journal AIP REVIEW OF SCIENTIFIC INSTRUMENTS  
  Volume 83 Issue (up) Pages  
  Keywords SSPD, picosecond, time-resolution  
  Abstract We have developed a cryogenic measurement system for single-photon counting, which can be used

in optical experiments requiring high time resolution in the picosecond range. The system utilizes

niobium nitride superconducting nanowire single-photon detectors which are integrated in a timecorrelated

single-photon counting (TCSPC) setup. In this work, we describe details of the mechanical

design, the electrical setup, and the cryogenic optical components. The performance of the complete

system in TCSPC mode is tentatively benchmarked using 140 fs long laser pulses at a repetition

frequency of 75MHz. Due to the high temporal stability of these pulses, the measured time resolution

of 35 ps (FWHM) is limited by the timing jitter of the measurement system. The result was crosschecked

in a Coherent Anti-stokes Raman Scattering (CARS) setup, where scattered pulses from a

β-barium borate crystal have been detected with the same time resolution.		  
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  Notes Approved no  
  Call Number RPLAB @ seleznev @ Serial 885  
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