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Author Sclafani, M.; Marksteiner, M.; Keir, F. M. L.; Divochiy, A.; Korneev, A.; Semenov, A.; Gol'tsman, G.; Arndt, M. url  doi
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  Title Sensitivity of a superconducting nanowire detector for single ions at low energy Type Journal Article
  Year 2012 Publication (up) 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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  ISSN 0957-4484 ISBN Medium  
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  Notes PMID:22248823 Approved no  
  Call Number Serial 1380  
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Author Pernice, W. H. P.; Schuck, C.; Minaeva, O.; Li, M.; Goltsman, G. N.; Sergienko, A. V.; Tang, H. X. url  doi
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  Title High-speed and high-efficiency travelling wave single-photon detectors embedded in nanophotonic circuits Type Journal Article
  Year 2012 Publication (up) Nat. Commun. Abbreviated Journal Nat. Commun.  
  Volume 3 Issue Pages 1325 (1 to 10)  
  Keywords waveguide SSPD  
  Abstract Ultrafast, high-efficiency single-photon detectors are among the most sought-after elements in modern quantum optics and quantum communication. However, imperfect modal matching and finite photon absorption rates have usually limited their maximum attainable detection efficiency. Here we demonstrate superconducting nanowire detectors atop nanophotonic waveguides, which enable a drastic increase of the absorption length for incoming photons. This allows us to achieve high on-chip single-photon detection efficiency up to 91% at telecom wavelengths, repeatable across several fabricated chips. We also observe remarkably low dark count rates without significant compromise of the on-chip detection efficiency. The detectors are fully embedded in scalable silicon photonic circuits and provide ultrashort timing jitter of 18 ps. Exploiting this high temporal resolution, we demonstrate ballistic photon transport in silicon ring resonators. Our direct implementation of a high-performance single-photon detector on chip overcomes a major barrier in integrated quantum photonics.  
  Address Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA  
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  ISSN 2041-1723 ISBN Medium  
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  Notes PMID:23271658; PMCID:PMC3535416 Approved no  
  Call Number Serial 1375  
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Author Knee, George C.; Simmons, Stephanie; Gauger, Erik M.; Morton, John J. L.; Riemann, Helge; Abrosimov, Nikolai V.; Becker, Peter; Pohl, Hans-Joachim; Itoh, Kohei M.; Thewalt, Mike L. W.; Briggs, G. Andrew D.; Benjamin, Simon C. openurl 
  Title Violation of a Leggett–Garg inequality with ideal non-invasive measurements Type Journal Article
  Year 2012 Publication (up) Nature Communications Abbreviated Journal Nat. Comm.  
  Volume 3 Issue 606 Pages 6  
  Keywords fromIPMRAS  
  Abstract The quantum superposition principle states that an entity can exist in two different states simultaneously, counter to our 'classical' intuition. Is it possible to understand a given system's behaviour without such a concept? A test designed by Leggett and Garg can rule out this possibility. The test, originally intended for macroscopic objects, has been implemented in various systems. However to date no experiment has employed the 'ideal negative result' measurements that are required for the most robust test. Here we introduce a general protocol for these special measurements using an ancillary system, which acts as a local measuring device but which need not be perfectly prepared. We report an experimental realization using spin-bearing phosphorus impurities in silicon. The results demonstrate the necessity of a non-classical picture for this class of microscopic system. Our procedure can be applied to systems of any size, whether individually controlled or in a spatial ensemble.  
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  Call Number RPLAB @ gujma @ Serial 767  
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Author Smith, Devin H.; Gillett, Geoff; de Almeida, Marcelo P.; Branciard, Cyril; Fedrizzi, Alessandro; Weinhold, Till J.; Lita, Adriana; Calkins, Brice; Gerrits, Thomas; Wiseman, Howard M.; Nam, Sae Woo; White, Andrew G. openurl 
  Title Conclusive quantum steering with superconducting transition-edge sensors Type Journal Article
  Year 2012 Publication (up) Nature Communications Abbreviated Journal Nat. Comm.  
  Volume 3 Issue 625 Pages 6  
  Keywords fromIPMRAS  
  Abstract Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up applications in quantum communication. To date, all experimental tests with single-photon states have relied on post selection, allowing untrusted devices to cheat by hiding unfavourable events in losses. Here we close this 'detection loophole' by combining a highly efficient source of entangled photon pairs with superconducting transition-edge sensors. We achieve an unprecedented ~62% conditional detection efficiency of entangled photons and violate a steering inequality with the minimal number of measurement settings by 48 s.d.s. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test.  
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  Call Number RPLAB @ gujma @ Serial 768  
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Author Ghali, Mohsen; Ohtani1, Keita; Ohno, Yuzo; Ohno, Hideo openurl 
  Title Generation and control of polarization-entangled photons from GaAs island quantum dots by an electric field Type Journal Article
  Year 2012 Publication (up) Nature Communications Abbreviated Journal Nat. Comm.  
  Volume 3 Issue 661 Pages 6  
  Keywords fromIPMRAS  
  Abstract Semiconductor quantum dots are potential sources for generating polarization-entangled photons efficiently. The main prerequisite for such generation based on biexciton-exciton cascaded emission is to control the exciton fine-structure splitting. Among various techniques investigated for this purpose, an electric field is a promising means to facilitate the integration into optoelectronic devices. Here we demonstrate the generation of polarization-entangled photons from single GaAs quantum dots by an electric field. In contrast to previous studies, which were limited to In(Ga)As quantum dots, GaAs island quantum dots formed by a thickness fluctuation were used because they exhibit a larger oscillator strength and emit light with a shorter wavelength. A forward voltage was applied to a Schottky diode to control the fine-structure splitting. We observed a decrease and suppression in the fine-structure splitting of the studied single quantum dot with the field, which enabled us to generate polarization-entangled photons with a high fidelity of 0.72 ± 0.05.  
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  Call Number RPLAB @ gujma @ Serial 769  
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Author Grotz, Bernhard; Hauf, Moritz V.; Dankerl, Markus; Naydenov, Boris; Pezzagna, Sébastien; Meijer, Jan; Jelezko, Fedor; Wrachtrup, Jörg; Stutzmann, Martin; Reinhard, Friedemann; Garrido, Jose A. openurl 
  Title Charge state manipulation of qubits in diamond Type Journal Article
  Year 2012 Publication (up) Nature Communications Abbreviated Journal Nat. Comm.  
  Volume 3 Issue 729 Pages 6  
  Keywords fromIPMRAS  
  Abstract The nitrogen-vacancy (NV) centre in diamond is a promising candidate for a solid-state qubit. However, its charge state is known to be unstable, discharging from the qubit state NV- into the neutral state NV0 under various circumstances. Here we demonstrate that the charge state can be controlled by an electrolytic gate electrode. This way, single centres can be switched from an unknown non-fluorescent state into the neutral charge state NV0, and the population of an ensemble of centres can be shifted from NV0 to NV-. Numerical simulations confirm the manipulation of the charge state to be induced by the gate-controlled shift of the Fermi level at the diamond surface. This result opens the way to a dynamic control of transitions between charge states and to explore hitherto inaccessible states, such as NV+.  
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  Call Number RPLAB @ gujma @ Serial 770  
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Author Gao, Jie; McMillan, James F.; Wong, Chee Wei openurl 
  Title Nanophotonics: Remote on-chip coupling Type Journal Article
  Year 2012 Publication (up) 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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  Call Number RPLAB @ gujma @ Serial 779  
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Author Pile, David openurl 
  Title How many bits can a photon carry Type Journal Article
  Year 2012 Publication (up) Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue 1 Pages 14-15  
  Keywords fromIPMRAS  
  Abstract Quantum physics offers a way to enhance the amount of information a photon can carry, with potential applications in optical communication, lithography, metrology and imaging.  
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  Notes View from... OSA Frontiers in Optics 2011: How many bits can a photon carry? Approved no  
  Call Number RPLAB @ gujma @ Serial 780  
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Author Santori, Charles; Beausoleil, Raymond G. openurl 
  Title Quantum memory: Phonons in diamond crystals Type Journal Article
  Year 2012 Publication (up) 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 Xu, XinAn; Wong, Chee Wei openurl 
  Title Quantum optics: Correlations on a chip Type Journal Article
  Year 2012 Publication (up) 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 He, Rongrui; Sazio, Pier J. A.; Peacock, Anna C.; Healy, Noel; Sparks, Justin R.; Krishnamurthi, Mahesh; Gopalan, Venkatraman; Badding, John V. openurl 
  Title Integration of gigahertz-bandwidth semiconductor devices inside microstructured optical fibres Type Journal Article
  Year 2012 Publication (up) Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue 3 Pages 174-179  
  Keywords fromIPMRAS  
  Abstract The prospect of an all-fibre optical communications network in which light can be generated, modulated and detected within the fibre itself without the need for discrete optoelectronic devices is an appealing one. However, to become a reality, this approach requires the incorporation of optoelectronic materials and functionalities into silica fibres to create a new breed of semiconductor-fibre hybrid devices for performing various tasks. Here, we report the integration of precisely doped semiconductor materials and high-quality rectifying semiconductor junctions into microstructured optical fibres, enabling high-speed, in-fibre functionalities such as photodetection at telecommunications wavelengths. These semiconductor-fibre hybrid devices exhibit a bandwidth of up to 3 GHz and seamless coupling to standard single-mode optical fibres.  
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  Call Number RPLAB @ gujma @ Serial 783  
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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 openurl 
  Title Observation of eight-photon entanglement Type Journal Article
  Year 2012 Publication (up) 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 Pris, Andrew D.; Utturkar, Yogen; Surman, Cheryl; Morris, William G.; Vert, Alexey; Zalyubovskiy, Sergiy; Deng, Tao; Ghiradella, Helen T.; Potyrailo, Radislav A. openurl 
  Title Towards high-speed imaging of infrared photons with bio-inspired nanoarchitectures Type Journal Article
  Year 2012 Publication (up) Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue 3 Pages 195-200  
  Keywords fromIPMRAS  
  Abstract Existing infrared detectors rely on complex microfabrication and thermal management methods. Here, we report an attractive platform of low-thermal-mass resonators inspired by the architectures of iridescent Morpho butterfly scales. In these resonators, the optical cavity is modulated by its thermal expansion and refractive index change, resulting in `wavelength conversion' of mid-wave infrared (3-8 µm) radiation into visible iridescence changes. By doping Morpho butterfly scales with single-walled carbon nanotubes, we achieved mid-wave infrared detection with 18-62 mK noise-equivalent temperature difference and 35-40 Hz heat-sink-free response speed. The nanoscale pitch and the extremely small thermal mass of individual `pixels' promise significant improvements over existing detectors. Computational analysis explains the origin of this thermal response and guides future conceptually new bio-inspired thermal imaging sensor designs.  
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  Call Number RPLAB @ gujma @ Serial 785  
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Author Nozaki, Kengo; Shinya, Akihiko; Matsuo, Shinji; Suzaki, Yasumasa; Segawa, Toru; Sato, Tomonari; Kawaguchi, Yoshihiro; Takahashi, Ryo; Notomi, Masaya openurl 
  Title Ultralow-power all-optical RAM based on nanocavities Type Journal Article
  Year 2012 Publication (up) Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue 4 Pages 248-252  
  Keywords fromIPMRAS  
  Abstract Optical random-access memory (o-RAM) has been regarded as one of the most difficult challenges in terms of replacing its various functionalities in electronic circuitry with their photonic counterparts. Nevertheless, it constitutes a key device in optical routing and processing. Here, we demonstrate that photonic crystal nanocavities with an ultrasmall buried heterostructure design can solve most of the problems encountered in previous o-RAMs. By taking advantage of the strong confinement of photons and carriers and allowing heat to escape efficiently, we have realized all-optical RAMs with a power consumption of only 30 nW, which is more than 300 times lower than the previous record, and have achieved continuous operation. We have also demonstrated their feasibility in multibit integration. This paves the way for constructing a low-power large-scale o-RAM system that can handle high-bit-rate optical signals.  
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  Call Number RPLAB @ gujma @ Serial 786  
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Author Akalin, Tahsin openurl 
  Title Terahertz sources: Powerful photomixers Type Journal Article
  Year 2012 Publication (up) Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue 2 Pages 81  
  Keywords fromIPMRAS  
  Abstract An efficient continuous-wave source of terahertz radiation that combines the outputs from two near-infrared semiconductor lasers in a novel photomixer looks set to benefit applications in spectroscopy and imaging.  
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  Call Number RPLAB @ gujma @ Serial 787  
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