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Assessing the Progress of Trapped-Ion Processors Towards Fault-Tolerant Quantum Computation

Physical Review X 2017年第4期7卷 041061-041061页

作者： A. Bermudez X. Xu R. Nigmatullin J. O’Gorman v. Negnevitsky P. Schindler T. Monz U. G. Poschinger C. Hempel J. Home F. Schmidt-Kaler M. Biercuk R. Blatt S. Benjamin M. Müller Department of Physics College of Science Swansea University Singleton Park Swansea SA2 8PP United Kingdom Instituto de Física Fundamental IFF-CSIC Madrid E-28006 Spain Department of Materials University of Oxford Oxford OX1 3PH United Kingdom Complex Systems Research Group Faculty of Engineering and IT The University of Sydney Sydney Australia Institute for Quantum Electronics ETH Zürich Otto-Stern-Weg 1 8093 Zürich Switzerland Institute for Experimental Physics University of Innsbruck 6020 Innsbruck Austria Institut für Physik Universität Mainz Staudingerweg 7 55128 Mainz Germany ARC Centre for Engineered Quantum Systems School of Physics The University of Sydney Sydney NSW 2006 Australia Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences A-6020 Innsbruck Austria

A quantitative assessment of the progress of small prototype quantum processors towards fault-tolerant quantum computation is a problem of current interest in experimental and theoretical quantum information science. We introduce a necessary and fair criterion for quantum error correction (QEC), which must be achieved in the development of these quantum processors before their sizes are sufficiently big to consider the well-known QEC threshold. We apply this criterion to benchmark the ongoing effort in implementing QEC with topological color codes using trapped-ion quantum processors and, more importantly, to guide the future hardware developments that will be required in order to demonstrate beneficial QEC with small topological quantum codes. In doing so, we present a thorough description of a realistic trapped-ion toolbox for QEC and a physically motivated error model that goes beyond standard simplifications in the QEC literature. We focus on laser-based quantum gates realized in two-species trapped-ion crystals in high-optical aperture segmented traps. Our large-scale numerical analysis shows that, with the foreseen technological improvements described here, this platform is a very promising candidate for fault-tolerant quantum computation.

关键词： Cooling & trapping Quantum computation Quantum information architectures & platforms Quantum information processing

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Trans-impedance amplifier (HA) design for visible Light Communication (vLC) using commercially available OP-AMP 3

Trans-impedance amplifier (HA) design for Visible Light Comm...

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3rd International Conference on Information Technology, Computer, and Electrical engineering, ICITACEE 2016

作者： Fuada, Syifaul Putra, Angga Pratama Aska, Yulian Adiono, Trio Microelectronic Center - Pusat Penelitian Mikroektronika VLC Research Group ITB PAU Building ITB Campus Tamansari street No. 126 Bandung city West Java40132 Indonesia

ISBN: (纸本)9781509014347

Trans-impedance amplifier (TIA) are widely used for optical sensing applications (precision instrumentation) and optical communication, such as: fiber optic, IR communication and also visible Light Communication (vLC). TIA convert the current (I) into voltage (v). Application TIA design depend of objectives requirement system, for high speed as well as high-band, low noise, low power and others. This paper explains the empirical experiment of TIA for high-band vLC with over 1-MHz Gain Bandwidth Product (GPWP) estimated. We implement general topology mode: as photovoltaic. The selection of the best resistor feedback (Rf) and compensator (Cf) are presented, we compare simulation approach against real implementation. The OP-AMP chosen from Texas Instruments® product, OPA 656. The TINA™ SPICE® simulator used as simulation's tool. This research contribution lies in applied of engineering design methodology with detailed step to develop major vLC system, we focus on photodiode amplifier only. By depth analysis, can be known next research addresses and obtain the best results without trial and error methods. © 2016 IEEE.

关键词： Light

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design & development of plastics tele microscope visual aids for vision impaired using state-of-art aspheric technology

Design & development of plastics tele microscope visual aids...

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IEEE Region 10 Humanitarian Technology Conference (R10-HTC)

作者： Neha Khatri vinod Mishra Mukesh Kumar vinod Karar Ramagopal. v. Sarepaka Optical Devices &System Division CSIR-Central Scientific Instruments Organisation Chandigarh India Optics & Allied Engineering Bangaluru India

ISBN: (纸本)9781538621769;9781538621752

Low vision indicates a visual acuity of less than 6/18 but better than 3/60 or / and field of vision reduced to 20° or less. As per the report published in journal of ophthalmology, every five seconds one person in our world goes blind; every minute, one child goes blind. As per Indian Council of Medical Research, India has more than 40 million persons with visual impairments of serious nature. Age-related macular degeneration is the leading cause of Low vision, followed by diabetic retinopathy and glaucoma. A variety of other conditions such as in-operable or pre-operative cataracts and other hereditary diseases can also cause impaired vision. Most of these visual impairments cannot be corrected by surgical means, nor by conventional spectacles. Hence, it is vital to develop dedicated visual Aids for Near vision & Distance vision to enable the person with low vision to perform their daily tasks independently. In current work light weight, tele-microscopes are developed by direct removal of material by ultra-precision machining method. This device employs plastic aspheric lenses in plano-convex and plano-concave configuration mounted in a lightweight housing with a power accommodation of +2 Dioptre. Plastic aspheric lenses are fabricated by single point diamond turning (SPDT) machine. Developed visual aids have controlled profile to improve the vision quality. The mechanical housing design provides flexibility to use the device in dual configuration i.e. hand-held and spectacle frame mounted.

关键词： Lenses visualization optical device fabrication Tools Adaptive optics Diamond

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design and analysis of high sensitivity photosensor using Cylindrical Surrounding Gate MOSFET for low power applications

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engineering SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH 2016年第4期19卷 1864-1870页

作者： Jain, Aakash Sharma, Sanjeev Kumar Raj, Balwinder NIT Jalandhar Dept ECE VLSI Design Lab Jalandhar 144011 Punjab India

In this paper, a high sensitivity photosensor is proposed that utilizes the Zinc Oxide (metallic ZnO) which act as a transparent optical window over channel. High sensitivity is achieved by using Cylindrical Surrounding Gate Metal Oxide Semiconductor Field Effect Transistor (CSG MOSFET). On being exposed to light there is substantial increase in conductance and thereby change in the subthreshold current under exposure is utilized as a sensitivity parameter. Most of the Conventional FET based photosensors that are available utilizes threshold voltage as the parameter for sensitivity comparison but in this proposed sensor, under illumination change in the conductance resulting in variation of the subthreshold current is considered to be the sensitivity parameter. Performance comparison with Double Gate Metal Oxide Semiconductor Field Effect Transistor (DG MOSFET) in terms of sensitivity, threshold voltage and I-on/I-off ratio is also done and observed results shows that CSG MOSFET is an ideal candidate for being used as a high sensitivity photosensor because in CSG MOSFET due to effective control of gate over channel low dark current, high sensitivity, low threshold voltage and high Ion/Ioff ratio can be achieved. Further impact of channel radius on responsivity (R-e), quantum efficiency (Q(e)) and I-on/I-off ratio is also studied for the proposed device. (C) 2016 Karabuk University. Publishing services by Elsevier B.v.

关键词： ATLAS-3D Dark current CSG MOSFET Photosensor Quantum efficiency Responsivity

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A new preprocessing and control board for the phase 2 electronics of AGATA experiment

A new preprocessing and control board for the phase 2 electr...

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2016 IEEE-NPSS Real Time Conference, RT 2016

作者： Collado, J. Blasco, J.M. Dosme, N. Gonzalez, v. Grave, X. Karkour, N. Lafay, X. Legay, E. Linget, D. Sanchis, E. University of Valencia School of Engineering Department of Electronic Engineering Burjassot Valencia46100 Spain University of Valencia Department of Physiotherapy Valencia46010 Spain CSNSM Université Paris-Sud Université Paris-Saclay Orsay91405 France

ISBN: (纸本)9781509020140

The electronics of AGATA HPGe segmented gamma ray detector faces a new challenge in the search of a bigger integration and cost reduction for the phase 2 of the experiment going beyond 45 crystals. This opportunity can be used to introduce a new architecture based on commercial standards while keeping backward compatibility with current electronics. In this sense, new FPGA devices and fast Ethernet links can be used to ease the preprocessing and control task and allowing for processor farms to distribute the processing load. At the same time, modularity should be a key feature of the design in the aim to make it upgradable in time and technology. This paper presents the design of a new preprocessing and control board that could fulfill with the experiment requirements having in mind that it should not be only a new system but also should serve as replacement of the current electronics. The design is intended to process the data coming from 3 crystals (114 channels) in the same board, with a total aggregate bandwidth of 216 Gpbs using 2 Gbps input optical fiber links in SNAP12 format and with a data readout done through Ethernet fiber optics. It is expected that, with this new system, the level of integration will raise up to 3 times while cost will scale down a 30% with respect to the current electronics. © 2016 IEEE.

关键词： Data transfer

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developments in fiber-positioning technology for the WEAvE instrument at the William Herschel Telescope 6

Developments in fiber-positioning technology for the WEAVE i...

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Ground-Based and Airborne Instrumentation for Astronomy vI

作者： Schallig, Ellen Lewis, Ian J. Gilbert, James Dalton, Gavin Brock, Matthew Abrams, Don Carlos Middleton, Kevin Aguerri, J. Alfonso L. Bonifacio, Piercarlo Carrasco, Esperanza Trager, Scott C. vallenari, Antonella Dept. of Physics University of Oxford Keble Road OX1 3RH United Kingdom RSAA Mount Stromlo Observatory Cotter Road Weston CreekACT2611 Australia RAL Space Science and Technology Facilities Council Rutherford Appleton Laboratory Harwell Oxford Didcot OxfordshireOX11 OQX United Kingdom Isaac Newton Group Santa Cruz de La Palma38700 Spain Instituto de Astrofisica de Canarias La Laguna Tenerife38200 Spain GEPI Observatiore de Paris Place Jules Janssen Meudon92195 France Mexico Kapteyn Instituut Rijksuniversiteit Groningen Postbus 800 GroningenNL-9700 AV Netherlands Osservatorio Astronomico di Padova INAF Vicolo Osservatorio 5 Padova35122 Italy

ISBN: (数字)9781510601963

ISBN: (纸本)9781510601956

WEAvE is the next-generation wide-field optical spectroscopy facility for the William Herschel Telescope (WHT) on La Palma in the Canary Islands, Spain. It is a multi-object "pick-and-place" fibre-fed spectrograph with a 1000 fibre multiplex behind a new dedicated 2° prime focus corrector. The WEAvE positioner concept uses two robots working in tandem in order to reconfigure a fully populated field within the expected 1 hour dwell-time for the instrument (a good match between the required exposure times and the limit of validity for a given configuration due to the effects of differential refraction). In this paper we describe some of the final design decisions arising from the prototyping phase of the instrument design and provide an update on the current manufacturing status of the fibre positioner system. © 2016 SPIE.

关键词： Fibers

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Electrically controlled optical-mode switch for fundamental mode and first order mode

Electrically controlled optical-mode switch for fundamental ...

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作者： Imansyah, Ryan Tanaka, Tatsushi Himbele, Luke Jiang, Haisong Hamamoto, Kiichi Interdisciplinary Graduate School of Engineering Science Kyushu University Kasuga Fukuoka816-8580 Japan

We have proposed an optical mode switch, the principle of which is based on the partial phase shift of injected light;therefore, one important issue is to clarify the proper design criteria for the mode combiner section. We focused on the bending radius of the S-bend waveguide issue that is connected to the multi mode waveguide in the Y-junction section that acts as mode combiner. Long radius leads to undesired mode coupling before the Y-junction section, whereas a short radius causes radiation loss. Thus, we simulated this mode combiner by the beam-propagation method to obtain the proper radius. In addition, we used a trench pin structure to simplify the fabrication process into a single-step dry-etching process. As a result, we successfully fabricated an optical-mode switch with the bending radius R = 610 m. It showed the successful electrical mode switching and the achieved mode crosstalk was approximately %10 dB for 1550nm wavelength with the injection current of 60mA (5.7 v). © 2016 The Japan Society of Applied Physics.

关键词： Beam propagation method

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Cavity-excited Huygens' metasurface antennas for near-unity aperture illumination efficiency from arbitrarily large apertures

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NATURE COMMUNICATIONS 2016年第1期7卷 1-10页

作者： Epstein, Ariel Wong, Joseph P. S. Eleftheriades, George v. Univ Toronto Edward S Rogers Dept Elect & Comp Engn Toronto ON M5S 2E4 Canada

One of the long-standing problems in antenna engineering is the realization of highly directive beams using low-profile devices. In this paper, we provide a solution to this problem by means of Huygens' metasurfaces (HMSs), based on the equivalence principle. This principle states that a given excitation can be transformed to a desirable aperture field by inducing suitable electric and (equivalent) magnetic surface currents. Building on this concept, we propose and demonstrate cavity-excited HMS antennas, where the single-source-fed cavity is designed to optimize aperture illumination, while the HMS facilitates the current distribution that ensures phase purity of aperture fields. The HMS breaks the coupling between the excitation and radiation spectra typical to standard partially reflecting surfaces, allowing tailoring of the aperture properties to produce a desirable radiation pattern, without incurring edge-taper losses. The proposed low-profile design yields near-unity aperture illumination efficiencies from arbitrarily large apertures, offering new capabilities for microwave, terahertz and optical radiators.

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Derivation of ground models and characteristic geotechnical profiles in offshore wind farms at pre-FID stage 26

Derivation of ground models and characteristic geotechnical ...

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26th Annual International Ocean and Polar engineering Conference, ISOPE 2016

作者： Terente, v.A. Owen, M.J. Higgs, D.M. Ellery, G. Cathie Associates Ltd. Newcastle-upon-Tyne United Kingdom

ISBN: (纸本)9781880653883

Large offshore Windfarm developments require significant investment decisions at early stages (pre-funding investment decision, so called pre-FID stage), when in many cases geotechnical information at the majority of the proposed turbine positions is not available or has been performed to a limited depth. The generation of a ground model integrating desk study (geology, seabed mobility, depositional environment, formation variability, etc.), geophysical and advanced borehole data is therefore key in the evaluation of future survey strategies, foundation concepts, construction risks and cost estimates of foundation works for final investment decisions. current geotechnical design practice is generally based on probabilistic assessments, factors of safety and derivation of design geotechnical profiles from borehole data at the location of the structure. Little guidance exists with regards to the preparation of an advanced geotechnical investigation report that also evaluates the anticipated ground profiles and geotechnical risks at locations where partial, or no, borehole data exists. This paper puts forward a recommended process, based on a thorough understanding of the geology and the integration of geological models, geotechnical, geophysical data and application of geostatistical methods to report the anticipated ground profiles and uncertainty at positions where only partial borehole information exists. The process is then illustrated with several examples of windfarm cases. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Cost estimating

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Chemoretina: An alternate approach to retinal prosthesis: visual stimulation strategy using chemicals

Chemoretina: An alternate approach to retinal prosthesis: Vi...

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2016 IEEE Annual India Conference, INDICON 2016

作者： Pai, Anuradha v. Bellare, Jayesh Gandhi, Tapan K. Silicate Lab Dept. of Biosciences and Bioengineering Indian Institute of Technology Powai Mumbai India Silicate Lab Dept. of Chemical Engineering Indian Institute of Technology Powai Mumbai India Dept. of Electrical Engineering Indian Institute of Technology Delhi New Delhi India

ISBN: (纸本)9781509036462

Hereditary degenerative diseases of retina (such as Retinitis pigmentosa and age related macular degeneration), cause photoreceptor cell loss leading to progressive visual impairment. Since there is no medical treatment to reverse/overcome the effects of photoreceptor loss, restoring vision with the aid of a prosthetic seems to be the only option. Different types of prosthesis incorporating different geometries and design of multielectrode arrays have been developed to be surgically placed in and around retina. However patients implanted with these devices have been able to see only flickers of light (or phosphenes). Therefore in the present work we have come up with an alternate strategy of stimulating retina through chemicals: Chemoretina. Briefly, our idea involves stimulating voltage gated sodium channels of retinal bipolar cells using drugs, in a manner analogous to photoreceptor stimulation. This paper illustrates our approach to Chemoretina and current developments so far. © 2016 IEEE.

关键词： Prosthetics

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