28 research outputs found

    Efficient Grover search with Rydberg blockade

    Full text link
    We present efficient methods to implement the quantum computing Grover search algorithm using the Rydberg blockade interaction. We show that simple pi-pulse excitation sequences between ground and Rydberg excited states readily produce the key conditional phase shift and inversion-about-the mean unitary operations for the Grover search. Multi-qubit implementation schemes suitable for different properties of the atomic interactions are identifed and the error scaling of the protocols with system size is found to be promising for immediate experimental investigation.Comment: Detailed description of algorithm for sub-register architecture. Error budget modified for Cs atomic parameters. To appear in J. Phys. B. Special Issue on Strong Rydberg interactions in ultracold atomic and molecular gase

    Independent individual addressing of multiple neutral atom qubits with a MEMS beam steering system

    Full text link
    We demonstrate a scalable approach to addressing multiple atomic qubits for use in quantum information processing. Individually trapped 87Rb atoms in a linear array are selectively manipulated with a single laser guided by a MEMS beam steering system. Single qubit oscillations are shown on multiple sites at frequencies of ~3.5 MHz with negligible crosstalk to neighboring sites. Switching times between the central atom and its closest neighbor were measured to be 6-7 us while moving between the central atom and an atom two trap sites away took 10-14 us.Comment: 9 pages, 3 figure

    Search for gluonic bound states in high energy proton-proton collisions

    No full text
    The Double Pomeron Exchange process is studied as a poten- tial source for the production of gluonic bound states utilizing the Intersecting Storage Rings at the European Organization for Nu- clear Research in Geneva, Switzerland. Three different triggers are studied, which differ in the requirements placed on the slow central system produced by the Pomeron-Pomeron interaction;Exclusive four and six prong events are studied. A spin-parity analysis is performed on the (pi)('+)(pi)('-) system in the exclusive channel pp (--->) pp(pi)('+)(pi)('-) for two of the triggers. The large enhancement pre- viously seen in DPE reactions in the region of the f('0) meson is con- firmed to be a spin-two object. No other resonant states are observed in the (pi)('+)(pi)('-) system. The exclusive channels pp (--->) ppK('+)K('-) and pp (--->) pppp are examined, but due to limited statistics no strong conclu- sions can be drawn from these samples. The exclusive channel pp (--->) pp(pi)('+)(pi)('+)(pi)('-)(pi)('-) is analyzed for the subprocesses pp (--->) pp(rho)('0)(pi)('+)(pi)('-) and pp (--->) pp(rho)('0)(rho)('0). No enhancement is seen for the (rho)('0)(rho)('0) channel. This result is quite different from that obtained for the topologically similar (gamma)(gamma) interaction in e('+)e('-) collisions. A simple spin-parity analysis of the (pi)('+)(pi)('+)(pi)('-)(pi)('-) system reveals no structure as a function of the four pion mass;The exclusive process pp (--->) ppK(,s)('0)K('(+OR-))(pi)('(-OR+)) is studied and the K('0)K(pi) mass spectrum is examined. An enhancement is seen in the region of 1500 MeV, but it appears to originate from events which have missing tracks, rather than from the exclusive final state. While this does not preclude its interpretation as a genuine resonant state, it does not;mean that a definite statement cannot be made on the basis of this analysis; ('1)DOE Report IS-T-1249. This work was performed under contract No. W-7407-Eng-82 with the U.S. Department of Energy.</p

    Deep Underground Neutrino Experiment (DUNE) Near Detector Conceptual Design Report

    No full text
    International audienceThe Deep Underground Neutrino Experiment (DUNE) is an international, world-class experiment aimed at exploring fundamental questions about the universe that are at the forefront of astrophysics and particle physics research. DUNE will study questions pertaining to the preponderance of matter over antimatter in the early universe, the dynamics of supernovae, the subtleties of neutrino interaction physics, and a number of beyond the Standard Model topics accessible in a powerful neutrino beam. A critical component of the DUNE physics program involves the study of changes in a powerful beam of neutrinos, i.e., neutrino oscillations, as the neutrinos propagate a long distance. The experiment consists of a near detector, sited close to the source of the beam, and a far detector, sited along the beam at a large distance. This document, the DUNE Near Detector Conceptual Design Report (CDR), describes the design of the DUNE near detector and the science program that drives the design and technology choices. The goals and requirements underlying the design, along with projected performance are given. It serves as a starting point for a more detailed design that will be described in future documents

    DUNE Offline Computing Conceptual Design Report

    No full text
    This document describes Offline Software and Computing for the Deep Underground Neutrino Experiment (DUNE) experiment, in particular, the conceptual design of the offline computing needed to accomplish its physics goals. Our emphasis in this document is the development of the computing infrastructure needed to acquire, catalog, reconstruct, simulate and analyze the data from the DUNE experiment and its prototypes. In this effort, we concentrate on developing the tools and systems thatfacilitate the development and deployment of advanced algorithms. Rather than prescribing particular algorithms, our goal is to provide resources that are flexible and accessible enough to support creative software solutions as HEP computing evolves and to provide computing that achieves the physics goals of the DUNE experiment

    Reconstruction of interactions in the ProtoDUNE-SP detector with Pandora

    No full text
    International audienceThe Pandora Software Development Kit and algorithm libraries provide pattern-recognition logic essential to the reconstruction of particle interactions in liquid argon time projection chamber detectors. Pandora is the primary event reconstruction software used at ProtoDUNE-SP, a prototype for the Deep Underground Neutrino Experiment far detector. ProtoDUNE-SP, located at CERN, is exposed to a charged-particle test beam. This paper gives an overview of the Pandora reconstruction algorithms and how they have been tailored for use at ProtoDUNE-SP. In complex events with numerous cosmic-ray and beam background particles, the simulated reconstruction and identification efficiency for triggered test-beam particles is above 80% for the majority of particle type and beam momentum combinations. Specifically, simulated 1 GeV/cc charged pions and protons are correctly reconstructed and identified with efficiencies of 86.1±0.6\pm0.6% and 84.1±0.6\pm0.6%, respectively. The efficiencies measured for test-beam data are shown to be within 5% of those predicted by the simulation

    The DUNE Far Detector Vertical Drift Technology, Technical Design Report