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| Author | Smirnov, A. V.; Karmantsov, M. S.; Smirnov, K. V.; Vakhtomin, Y. B.; Masterov, D. V.; Tarkhov, M. A.; Pavlov, S. A.; Parafin, A. E. | ||||
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Terahertz response of thin-film YBCO bolometers | Type | Journal Article | ||
| Year | 2012 | Publication | Tech. Phys. | Abbreviated Journal | Tech. Phys. |
| Volume | 57 | Issue | 12 | Pages | 1716-1719 |
| Keywords | YBCO HEB | ||||
| Abstract | The bolometric response of high-temperature thin-film YBCO superconducting detectors to an electromagnetic radiation with a frequency of 2.5 THz is measured for the first time. The minimum value of the noise-equivalent power of the detectors is 3.5 × 10−9 W/Hz−−−√. The feasibility of further increasing the sensitivity of the detectors is discussed. | ||||
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| ISSN | 1063-7842 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1817 | |||
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| Author | Pütz, P.; Honingh, C. E.; Jacobs, K.; Justen, M.; Schultz, M.; Stutzki, J. | ||||
| Title |
Terahertz hot electron bolometer waveguide mixers for GREAT | Type | Journal Article | ||
| Year | 2012 | Publication | Astron. Astrophys. | Abbreviated Journal | A&A |
| Volume | 542 | Issue | Pages | L2 | |
| Keywords | HEB mixer, applications | ||||
| Abstract | Context. Supplementing the publications based on the first-light observations with the German REceiver for Astronomy at Terahertz frequencies (GREAT) on SOFIA, we present background information on the underlying heterodyne detector technology. This Letter complements the GREAT instrument Letter and focuses on the mixers itself. Aims. We describe the superconducting hot electron bolometer (HEB) detectors that are used as frequency mixers in the L1 (1400 GHz), L2 (1900 GHz), and M (2500 GHz) channels of GREAT. Measured performance of the detectors is presented and background information on their operation in GREAT is given. Methods. Our mixer units are waveguide-based and couple to free-space radiation via a feedhorn antenna. The HEB mixers are designed, fabricated, characterized, and flight-qualified in-house. We are able to use the full intermediate frequency bandwidth of the mixers using silicon-germanium multi-octave cryogenic low-noise amplifiers with very low input return loss. Results. Superconducting HEB mixers have proven to be practical and sensitive detectors for high-resolution THz frequency spectroscopy on SOFIA. We show that our niobium-titanium-nitride (NbTiN) material HEBs on silicon nitride (SiN) membrane substrates have an intermediate frequency (IF) noise roll-off frequency above 2.8 GHz, which does not limit the current receiver IF bandwidth. Our mixer technology development efforts culminate in the first successful operation of a waveguide-based HEB mixer at 2.5 THz and deployment for radioastronomy. A significant contribution to the success of GREAT is made by technological development, thorough characterization and performance optimization of the mixer and its IF interface for receiver operation on SOFIA. In particular, the development of an optimized mixer IF interface contributes to the low passband ripple and excellent stability, which GREAT demonstrated during its initial successful astronomical observation runs. |
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| Notes | Approved | no | |||
| Call Number | Serial | 907 | |||
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| Author | Mineev, Vladimir P. | ||||
| Title |
Superfluid helium: Order in disorder | Type | Journal Article | ||
| Year | 2012 | Publication | Nature Physics | Abbreviated Journal | Nat. Phys. |
| Volume | 8 | Issue | 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 | 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 | ||||
| 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 | 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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| Author | Zhang, W.; Miao, W.; Yao, Q. J.; Lin, Z. H.; Shi, S. C.; Gao, J. R.; Goltsman, G. N. | ||||
| Title |
Spectral response and noise temperature of a 2.5 THz spiral antenna coupled NbN HEB mixer | Type | Journal Article | ||
| Year | 2012 | Publication | Phys. Procedia | Abbreviated Journal | Phys. Procedia |
| Volume | 36 | Issue | Pages | 334-337 | |
| Keywords | NbN HEB mixer | ||||
| Abstract | We report on a 2.5 THz spiral antenna coupled NbN hot electron bolometer (HEB) mixers, fabricated with in-situ process. The receiver noise temperature with lowest value of 1180 K is in good agreement with calculated quantum efficiency factor as a function of bias voltage. In addition, the measured spectral response of the spiral antenna coupled NbN HEB mixer shows broad frequency coverage of 0.8-3 THz, and corrected response for optical losses, FTS, and coupling efficiency between antenna and bolometer falls with frequency due to diffraction-limited beam of lens/antenna combination. | ||||
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| ISSN | 1875-3892 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1381 | |||
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| Author | Sclafani, M.; Marksteiner, M.; Keir, F. M. L.; Divochiy, A.; Korneev, A.; Semenov, A.; Gol'tsman, G.; Arndt, M. | ||||
| Title |
Sensitivity of a superconducting nanowire detector for single ions at low energy | Type | Journal Article | ||
| Year | 2012 | Publication | Nanotechnol. | Abbreviated Journal | Nanotechnol. |
| Volume | 23 | Issue | 6 | Pages | 065501 (1 to 5) |
| Keywords | NbN SSPD, SNSPD, superconducting single ion detector, SSID, SNSID | ||||
| Abstract | We report on the characterization of a superconducting nanowire detector for ions at low kinetic energies. We measure the absolute single-particle detection efficiency eta and trace its increase with energy up to eta = 100%. We discuss the influence of noble gas adsorbates on the cryogenic surface and analyze their relevance for the detection of slow massive particles. We apply a recent model for the hot-spot formation to the incidence of atomic ions at energies between 0.2 and 1 keV. We suggest how the differences observed for photons and atoms or molecules can be related to the surface condition of the detector and we propose that the restoration of proper surface conditions may open a new avenue for SSPD-based optical spectroscopy on molecules and nanoparticles. | ||||
| Address | Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, Vienna, Austria | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0957-4484 | ISBN | Medium | ||
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| Notes | PMID:22248823 | Approved | no | ||
| Call Number | Serial | 1380 | |||
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| Author | Pentin, I. V.; Smirnov, A. V.; Ryabchun, S. A.; Ozhegov, R. V.; Gol’tsman, G. N.; Vaks, V. L.; Pripolzin, S. I.; Pavel’ev, D. G.; Koshurinov, Y. I.; Ivanov, A. S. | ||||
| Title |
Semiconducting superlattice as a solid-state terahertz local oscillator for NbN hot-electron bolometer mixers | Type | Journal Article | ||
| Year | 2012 | Publication | Tech. Phys. | Abbreviated Journal | Tech. Phys. |
| Volume | 57 | Issue | 7 | Pages | 971-974 |
| Keywords | semiconducting superlattice frequency multiplier, NbN HEB mixers | ||||
| Abstract | We present the results of our studies of the semiconducting superlattice (SSL) frequency multiplier and its application as part of the solid state local oscillator (LO) in the terahertz heterodyne receiver based on a NbN hot-electron bolometer (HEB) mixer. We show that the SSL output power level increases as the ambient temperature is lowered to 4.2 K, the standard HEB operation temperature. | ||||
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| ISSN | 1063-7842 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1378 | |||
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| Author | Clerk, Aashish | ||||
| Title |
Quantum phononics: To see a SAW | Type | Journal Article | ||
| Year | 2012 | Publication | Nature Physics | Abbreviated Journal | Nat. Phys. |
| Volume | 8 | Issue | 4 | Pages | 256-257 |
| Keywords | fromIPMRAS | ||||
| Abstract | Mechanical oscillations of microscopic resonators have recently been observed in the quantum regime. This idea could soon be extended from localized vibrations to travelling waves thanks to a sensitive probe of so-called surface acoustic waves. | ||||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ gujma @ | Serial | 811 | ||
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| Author | Xu, XinAn; Wong, Chee Wei | ||||
| Title |
Quantum optics: Correlations on a chip | Type | Journal Article | ||
| Year | 2012 | Publication | Nature Photonics | Abbreviated Journal | Nat. Photon. |
| Volume | 6 | Issue | 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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| Call Number | RPLAB @ gujma @ | Serial | 782 | ||
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| Author | Santori, Charles; Beausoleil, Raymond G. | ||||
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Quantum memory: Phonons in diamond crystals | Type | Journal Article | ||
| Year | 2012 | Publication | Nature Photonics | Abbreviated Journal | Nat. Photon. |
| Volume | 6 | Issue | 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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| Call Number | RPLAB @ gujma @ | Serial | 781 | ||
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| Author | Hollenberg, Lloyd C. L. | ||||
| Title |
Quantum control: Through the quantum chicane | Type | Journal Article | ||
| Year | 2012 | Publication | Nature Physics | Abbreviated Journal | Nat. Phys. |
| Volume | 8 | Issue | 2 | Pages | 113-114 |
| Keywords | fromIPMRAS | ||||
| Abstract | In quantum control there is an inherent tension between high fidelity requirements and the need for speed to avoid decoherence. A direct comparison of quantum control protocols at these two extremes indicates where the sweet spot may lie. | ||||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ gujma @ | Serial | 812 | ||
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| Author | Kim, Yong-Su; Lee, Jong-Chan; Kwon, Osung; Kim, Yoon-Ho | ||||
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Protecting entanglement from decoherence using weak measurement and quantum measurement reversal | Type | Journal Article | ||
| Year | 2012 | Publication | Nature Physics | Abbreviated Journal | Nat. Phys. |
| Volume | 8 | Issue | 2 | Pages | 117-120 |
| Keywords | fromIPMRAS | ||||
| Abstract | Decoherence, often caused by unavoidable coupling with the environment, leads to degradation of quantum coherence. For a multipartite quantum system, decoherence leads to degradation of entanglement and, in certain cases, entanglement sudden death. Tackling decoherence, thus, is a critical issue faced in quantum information, as entanglement is a vital resource for many quantum information applications including quantum computing, quantum cryptography, quantum teleportation and quantum metrology. Here, we propose and demonstrate a scheme to protect entanglement from decoherence. Our entanglement protection scheme makes use of the quantum measurement itself for actively battling against decoherence and it can effectively circumvent even entanglement sudden death. | ||||
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| Call Number | RPLAB @ gujma @ | Serial | 815 | ||
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| Author | Yao, Xing-Can; Wang, Tian-Xiong; Xu, Ping; Lu, He; Pan, Ge-Sheng; Bao, Xiao-Hui; Peng, Cheng-Zhi; Lu, Chao-Yang; Chen, Yu-Ao; Pan, Jian-Wei | ||||
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Observation of eight-photon entanglement | Type | Journal Article | ||
| Year | 2012 | Publication | Nature Photonics | Abbreviated Journal | Nat. Photon. |
| Volume | 6 | Issue | 4 | Pages | 225-228 |
| Keywords | fromIPMRAS | ||||
| Abstract | The creation of increasingly large multipartite entangled states is not only a fundamental scientific endeavour in itself, but is also the enabling technology for quantum information. Tremendous experimental effort has been devoted to generating multiparticle entanglement with a growing number of qubits. So far, up to six spatially separated single photons have been entangled based on parametric downconversion. Multiple degrees of freedom of a single photon have been exploited to generate forms of hyper-entangled states. Here, using new ultra-bright sources of entangled photon pairs, an eight-photon interferometer and post-selection detection, we demonstrate for the first time the creation of an eight-photon Schrödinger cat state with genuine multipartite entanglement. The ability to control eight individual photons represents a step towards optical quantum computation, and will enable new experiments on, for example, quantum simulation, topological error correction and testing entanglement dynamics under decoherence. | ||||
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| Call Number | RPLAB @ gujma @ | Serial | 784 | ||
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| Author | Korneev, A.; Korneeva, Y.; Florya, I.; Voronov, B.; Goltsman, G. | ||||
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NbN nanowire superconducting single-photon detector for mid-infrared | Type | Journal Article | ||
| Year | 2012 | Publication | Phys. Procedia | Abbreviated Journal | Phys. Procedia |
| Volume | 36 | Issue | Pages | 72-76 | |
| Keywords | NbN SSPD, SNSPD | ||||
| Abstract | Superconducting single-photon detectors (SSPD) is typically 100 nm-wide supercondiucting strip in a shape of meander made of 4-nm-thick film. To reduce response time and increase voltage response a parallel connection of the strips was proposed. Recently we demonstrated that reduction of the strip width improves the quantum effciency of such a detector at wavelengths longer than 1.5 μm. Being encourage by this progress in quantum effciency we improved the fabrication process and made parallel-wire SSPD with 40-nm-wide strips covering total area of 10 μm x 10 μm. In this paper we present the results of the characterization of such a parallel-wire SSPD at 10.6 μm wavelength and demonstrate linear dependence of the count rate on the light power as it should be in case of single-photon response. | ||||
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| ISSN | 1875-3892 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1382 | |||
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| Author | Gao, Jie; McMillan, James F.; Wong, Chee Wei | ||||
| Title |
Nanophotonics: Remote on-chip coupling | Type | Journal Article | ||
| Year | 2012 | Publication | Nature Photonics | Abbreviated Journal | Nat. Photon. |
| Volume | 6 | Issue | 1 | Pages | 7-8 |
| Keywords | fromIPMRAS | ||||
| Abstract | Scientists have demonstrated strongly coupled photon states between two distant high-Q photonic crystal cavities connected by a photonic crystal waveguide. Remote dynamic control over the coupled states could aid the development of delay lines, optical buffers and qubit operations in both classical and quantum information processing. | ||||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ gujma @ | Serial | 779 | ||
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