CERN Document Server: Articles & Preprints
https://cds.cern.ch/collection/Articles%20%26%20Preprints
CERN Document Server latest documents in Articles & PreprintsenSun, 24 Jul 2016 20:24:07 GMTInvenio 1.1.3.1106-62468cds.support@cern.ch3601047377125https://cds.cern.ch/img/site_logo_rss.pngCERN Document Server
https://cds.cern.ch
Search Search this site:p
https://cds.cern.ch/search
Measurement of electroweak production of a W boson and two forward jets in proton-proton collisions at $ \sqrt{s} = $ 8 TeV
https://cds.cern.ch/record/2201233
A measurement is presented of the cross section for the electroweak production of a W boson in association with two jets in proton-proton collisions at a center-of-mass energy of 8 TeV. The data set was collected with the CMS detector and corresponds to an integrated luminosity of 19.3 fb$^{-1}$. The measured fiducial cross section for W bosons decaying to electrons or muons and for $p_{\mathrm{T}}^{\mathrm{j1}} > $ 60 GeV, $p_{\mathrm{T}}^{\mathrm{j2}} > $ 50 GeV, $|{\eta^{\mathrm{j}}} | < $ 4.7, and ${m_{\mathrm{jj}}} > $ 1000 GeV is 0.42 $\pm$ 0.04 (stat) $\pm$ 0.09 (syst) $\pm$ 0.01 (lumi) pb. This result is consistent with the standard model leading-order prediction of 0.50 $\pm$ 0.02 (scale) $\pm$ 0.02 (PDF) pb obtained with MADGRAPH5-aMC@NLO 2.1 interfaced to PYTHIA 6.4. This is the first cross section measurement for this process.CMS CollaborationSat, 23 Jul 2016 22:48:35 GMT24 Jul 2016CERN-EP-2016-093https://cds.cern.ch/record/22012332016093Measurement of the WZ production cross section in pp collisions at $\sqrt{s} = $ 13 TeV
https://cds.cern.ch/record/2201221
The WZ production cross section in proton-proton collisions at $\sqrt{s} = $ 13 TeV is measured with the CMS experiment at the LHC using a data sample corresponding to an integrated luminosity of 2.3 fb$^{-1}$. The measurement is performed in the leptonic decay modes ${\mathrm{ W }\mathrm{Z}} \to \ell\nu\ell'\ell'$, where $\ell$, $\ell' = \mathrm{ e }$, $\mu$. The measured cross section for the range 60 $ < m_{{\ell'\ell'}} < $ 120 GeV is $\sigma({\mathrm{ p }\mathrm{ p }} \to {\mathrm{ W }\mathrm{Z}} =$ 39.9 $\pm$ 3.2 (stat) ${}^{+2.9}_{-3.1 }$ (syst) $\pm$ 0.4 (theory) $\pm$ 1.3 (lumi) pb, consistent with the standard model prediction.CMS CollaborationSat, 23 Jul 2016 20:19:11 GMT23 Jul 2016CERN-EP-2016-169https://cds.cern.ch/record/22012212016169Searches for invisible Higgs boson decays with the CMS detector.
https://cds.cern.ch/record/2201136
Searches for invisible decays of the Higgs boson are presented. The data collected with the CMS detector at the LHC correspond to integrated luminosities of $5.1$, $19.7$, and $2.3~\mathrm{fb}^{-1}$ at centre-of-mass energies of 7, 8, and $13~\mathrm{TeV}$, respectively. The search channels target Higgs boson production via gluon fusion, vector boson fusion, and in association with a vector boson. Upper limits are placed on the branching fraction of the Higgs boson decay to invisible particles, as a function of the assumed production cross sections. The combination of all channels, assuming standard model production cross sections, yields an observed (expected) upper limit on the invisible branching fraction of $0.24$ ($0.23$) at a $95\%$ confidence level. The results are also interpreted under Higgs-portal dark matter models.CMS CollaborationSat, 23 Jul 2016 08:54:57 GMTCMS-PAS-HIG-16-016https://cds.cern.ch/record/220113616016Direct Photon Anisotropy and the Time Evolution of the Quark-Gluon Plasma
https://cds.cern.ch/record/2201115
Historically, the thermal photon inverse slope parameter has been interpreted as the thermalization temperature of the QGP. Observation of the thermal photon spectrum in nucleus-nucleus collisions at the ALICE and PHENIX experiments obtain the inverse slope parameter, but the obtained values are inconsistent with the thermalization temperature predicted by the hydrodynamic model. It has therefore been argued that the inverse slope parameter is not representative of the true QGP thermalization temperature because not all thermal photons are emitted at thermalization. This research will probe this assertion using an investigation of flow and nuclear suppression of thermal photons from ALICE Pb-Pb collisions at '\sqrt{s_{NN}}=2.76' TeV and comparison to p-p data at '\sqrt{s_{NN}}=2.76' TeV.Browning, Tyler AllenSrivastava, BrijeshFri, 22 Jul 2016 19:22:11 GMTCERN-THESIS-2016-078https://cds.cern.ch/record/22011152016078The LHCb Trigger in Run II
https://cds.cern.ch/record/2201081
Matev, RosenFri, 22 Jul 2016 13:44:41 GMT2016-06-06LHCb-TALK-2016-214https://cds.cern.ch/record/22010812016214Search for pair-produced heavy fourth-generation bottom-like quarks decaying to bZ and tW in 8,TeV proton-proton collisions with multilepton final states
https://cds.cern.ch/record/2201052
We present a search for anomalous production of events with three or more isolated leptons produced in proton-proton collisions at 8 TeV collected by the CMS experiment at the LHC. We analyze 9.2 /fb of data collected by the CMS experiment during the 2012 LHC run. We categorize observed multilepton events into exclusive search channels based on various quantities based on the identity and kinematics of the objects in the events. The search channels are ordered by the amount of expected Standard Model background. Explicit use of requirements such as missing transverse energy or total hadronic energy is avoided. We emphasize data-based estimation of the Standard Model backgrounds, but also use simulation to estimate some of the backgrounds when appropriate. We interpret search results in the context of a model involving the exotic bottom-like quark bprime decaying to two different modes bZ and tW with varying branching ratios. We derive exclusion limits as a function of the bprime mass as well as the branching ratios.Arora, Sanjay RLath, AmitabhFri, 22 Jul 2016 11:39:34 GMThttps://cds.cern.ch/record/2201052['']Splitting function in pp and PbPb collisions at 5.02 TeV
https://cds.cern.ch/record/2201026
A measurement of the splitting function in pp and PbPb collisions at a center of mass energy of 5.02 TeV per nucleon pair is presented. The virtuality evolution of partons traversing the hot QCD medium created in a heavy ion collision is potentially modified due to interactions with the color charges of the medium. This measurement probes this phenomenon by measuring the generalized fragmentation function, or splitting function, over a wide range of jet transverse momentum and various collision centrality selections. The shared momentum fraction of two subjets resulting from a parton
splitting is observed to be modified towards a more imbalanced fraction in central PbPb collisions compared to peripheral PbPb and pp collisions. In addition, the measurement in pp collisions is compared to the prediction of the splitting function from the {\tt PYTHIA} and {\tt HERWIG} event generators.CMS CollaborationFri, 22 Jul 2016 09:25:53 GMTCMS-PAS-HIN-16-006https://cds.cern.ch/record/220102616006Measurement of the total cross section from elastic scattering in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
https://cds.cern.ch/record/2201004
A measurement of the total $pp$ cross section at the LHC at $\sqrt{s}=8$ TeV is presented. An integrated luminosity of $500$ $\mu$b$^{-1}$ was accumulated in a special run with high-$\beta^{\star}$ beam optics to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable $t$. The measurement is performed with the ALFA sub-detector of ATLAS. Using a fit to the differential elastic cross section in the $-t$ range from $0.014$ GeV$^2$ to $0.1$ GeV$^2$ to extrapolate $t\rightarrow 0$, the total cross section, $\sigma_{\mathrm{tot}}(pp\rightarrow X)$, is measured via the optical theorem to be: $\sigma_{\mathrm{tot}}(pp\rightarrow X) = \mbox{96.07} \; \pm 0.18 \; ({\mbox{stat.}}) \pm 0.85 \; ({\mbox{exp.}}) \pm 0.31 \; (\mbox{extr.}) \; \mbox{mb} \;,$ where the first error is statistical, the second accounts for all experimental systematic uncertainties and the last is related to uncertainties in the extrapolation $t\rightarrow 0$. In addition, the slope of the exponential function describing the elastic cross section at small $t$ is determined to be $B = 19.74 \pm 0.05 \; ({\mbox{stat.}}) \pm 0.23 \; ({\mbox{syst.}}) \; \mbox{GeV}^{-2}$. ATLAS CollaborationFri, 22 Jul 2016 07:59:09 GMT22 Jul 2016CERN-EP-2016-158https://cds.cern.ch/record/22010042016158Fluid dynamics in the spirit of Cartan: a coordinate-free formulation of fluid dynamics. Part I: Inviscid equations in inertial and non-inertial frames
https://cds.cern.ch/record/2200982
Using Cartan's exterior calculus, we derive a coordinate-free formulation of the Euler equations. These equations are invariant under Galileian transformations, which constitute a global symmetry. With the introduction of an appropriate generalized Coriolis force, these equations become symmetric under general coordinate transformations. We show how exterior calculus simplifies dramatically the derivation of conservation laws. We also discuss the advantage of an exterior calculus formulation with respect to symmetry-preserving discretizations of the equations.Scotti, AlbertoFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06437https://cds.cern.ch/record/2200982['arXiv:1607.06437']arXiv:1607.06437Hybrid quantum systems for enhanced nonlinear optical susceptibilities
https://cds.cern.ch/record/2200981
Significant effort has been expended in the search for materials with ultra-fast nonlinear-optical susceptibilities, but most fall far below the fundamental limits. This work applies a theoretical materials development program that has identified a promising new hybrid made of a nanorod and a molecule. This system uses the electrostatic dipole moment of the molecule to break the symmetry of the metallic nanostructure that shifts the energy spectrum to make it optimal for a nonlinear-optical response near the fundamental limit. The structural parameters are varied to determine the ideal configuration, providing guidelines for making the best structures.Sullivan, DennisMossman, SeanKuzyk, Mark GFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06431https://cds.cern.ch/record/2200981['arXiv:1607.06431']arXiv:1607.06431Energy Continuity in Degenerate Density Functional Perturbation Theory
https://cds.cern.ch/record/2200980
Fractional occupation numbers can produce open-shell degeneracy in density functional theory. We develop the corresponding perturbation theory by requiring that a differentiable map connects the initial and perturbed states. The degenerate state connects to a single perturbed state which extremizes, but does not necessarily minimize or maximize, the energy with respect to occupation numbers. Using a system of three electrons in a harmonic oscillator potential, we relate the counterintuitive sign of first-order occupation numbers to eigenvalues of the electron-electron interaction Hessian.Palenik, Mark CDunlap, Brett IFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06404https://cds.cern.ch/record/2200980['arXiv:1607.06404']arXiv:1607.06404Correlation effects in focused transmission through disordered media
https://cds.cern.ch/record/2200979
By controlling the many degrees of freedom in the incident wavefront, one can manipulate wave propagation in complex structures. Such wavefront-shaping methods have been used extensively for controlling light transmitted into wavelength-scale regions (speckles), a property that is insensitive to correlations in the speckle pattern. Extending coherent control to larger regions should reveal correlation effects and is of great interest for several applications. Here we show with optical wavefront-shaping experiments that long-range correlations substantially increase the dynamic range of control over light transmitted onto larger target regions, when the number of targeted speckles, $M_2$, exceeds the dimensionless conductance $g$. Using a filtered random matrix ensemble appropriate for describing coherent diffusion in an open geometry, we show analytically that $M_2/g$ appears as the controlling parameter in universal scaling laws for several statistical properties of interest--predictions that we quantitatively confirm with experimental data. Our work elucidates the roles of speckle correlations and provides a general theoretical framework for modeling the coherent open diffusion in wavefront-shaping experiments.Hsu, Chia WeiLiew, Seng FattGoetschy, ArthurCao, HuiStone, A DouglasFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06403https://cds.cern.ch/record/2200979['arXiv:1607.06403']arXiv:1607.06403Effect of the Shafranov shift and the gradient of $\beta$ on intrinsic momentum transport in up-down asymmetric tokamaks
https://cds.cern.ch/record/2200978
Tokamaks with up-down asymmetric poloidal cross-sections spontaneously rotate due to turbulent transport of momentum. In this work, we investigate the effect of the Shafranov shift on this intrinsic rotation, primarily by analyzing tokamaks with tilted elliptical flux surfaces. By expanding the Grad-Shafranov equation in the large aspect ratio limit we calculate the magnitude and direction of the Shafranov shift in tilted elliptical tokamaks. The results show that, while the Shafranov shift becomes up-down asymmetric and depends strongly on the tilt angle of the flux surfaces, it is insensitive to the shape of the current and pressure profiles (when specific experimental parameters are kept fixed). Next, local nonlinear gyrokinetic simulations of these MHD equilibria are performed with GS2, which reveal that the Shafranov shift can significantly enhance the momentum transport. However, to be consistent, the effect of $\beta'$ (i.e. the radial gradient of $\beta$) on the magnetic equilibrium was also included. It was found to roughly cancel the enhancement of the momentum transport due to the Shafranov shift. Consequently, it seems that the shape of the $\beta$ profile has a strong effect on the rotation profile of an up-down asymmetric tokamak.Ball, JustinParra, Felix ILee, JungpyoCerfon, Antoine JFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06387https://cds.cern.ch/record/2200978['arXiv:1607.06387']arXiv:1607.06387Projected equations of motion approach to hybrid quantum/classical dynamics in dielectric-metal composites
https://cds.cern.ch/record/2200977
We introduce a hybrid method for dielectric-metal composites that describes the dynamics of the metallic system classically whilst retaining a quantum description of the dielectric. The time-dependent dipole moment of the classical system is mimicked by the introduction of projected equations of motion (PEOM) and the coupling between the two systems is achieved through an effective dipole-dipole interaction. To benchmark this method, we model a test system (semiconducting quantum dot-metal nanoparticle hybrid). We begin by examining the energy absorption rate, showing agreement between the PEOM method and the analytical rotating wave approximation (RWA) solution. We then investigate population inversion and show that the PEOM method provides an accurate model for the interaction under ultrashort pulse excitation where the traditional RWA breaks down.McMillan, Ryan JStella, LorenzoGrüning, MyrtaFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06386https://cds.cern.ch/record/2200977['arXiv:1607.06386']arXiv:1607.06386Ionic profiles close to dielectric discontinuities: Specific ion-surface interactions
https://cds.cern.ch/record/2200976
We study, by incorporating short-range ion-surface interactions, ionic profiles of electrolyte solutions close to a non-charged interface between two dielectric media. In order to account for important correlation effects close to the interface, the ionic profiles are calculated beyond mean-field theory, using the loop expansion of the free energy. We show how it is possible to overcome the well-known deficiency of the regular loop expansion close to the dielectric jump, and treat the non-linear boundary conditions within the framework of field theory. The ionic profiles are obtained analytically to one-loop order in the free energy, and their dependence on different ion-surface interactions is investigated. The Gibbs adsorption isotherm, as well as the ionic profiles are used to calculate the surface tension, in agreement with the reverse Hofmeister series. Consequently, from the experimentally-measured surface tension, one can extract a single adhesivity parameter, which can be used within our model to quantitatively predict hard to measure ionic profiles.Markovich, TomerAndelman, DavidOrland, HenriFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06375https://cds.cern.ch/record/2200976['arXiv:1607.06375']arXiv:1607.06375Continuum dynamics of the intention field under weakly cohesive social interactions
https://cds.cern.ch/record/2200975
We investigate the long-time dynamics of an opinion formation model inspired by a work by Borghesi, Bouchaud and Jensen. Firstly, we derive a Fokker-Planck type equation under the assumption that interactions between individuals produce little consensus of opinion (grazing collision approximation). Secondly, we study conditions under which the Fokker-Planck equation has non-trivial equilibria and derive the macroscopic limit (corresponding to the long-time dynamics and spatially localized interactions) for the evolution of the mean opinion. Finally, we compare two different types of interaction rates: the original one given in the work of Borghesi, Bouchaud and Jensen (symmetric binary interactions) and one inspired from works by Motsch and Tadmor (non-symmetric binary interactions). We show that the first case leads to a conservative model for the density of the mean opinion whereas the second case leads to a non-conservative equation. We also show that the speed at which consensus is reached asymptotically for these two rates has fairly different density dependence.Degond, PierreLiu, Jian-GuoMerino-Aceituno, SaraTardiveau, ThomasFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06372https://cds.cern.ch/record/2200975['arXiv:1607.06372']arXiv:1607.06372Retardation of Bulk Water Dynamics by Disaccharide Osmolytes
https://cds.cern.ch/record/2200974
The bioprotective nature of disaccharides is hypothesized to derive from the modification of the hydrogen bonding network of water which protects biomolecules through lowered water activity at the protein interface. Using ultrafast fluorescence spectroscopy we measured the relaxation of bulk water dynamics around the induced dipole moment of two fluorescent probes (Lucifer Yellow Ethylenediamine and Tryptophan). Our results indicate a reduction in bulk water reorganization rate of approximately of 30%. We observe this retardation in the low concentration regime measured at 0.1M and 0.25 M, far below the onset of glassy dynamics. This reduction in water activity could be significant in crowded biological systems, contributing to global change in protein energy landscape, resulting in a significant enhancement of protein stability under environmental stress. We observed similar dynamic reduction for two disaccharide osmolytes, sucrose and trehalose, with trehalose being the more effective dynamic reducer.Shukla, NimeshPomarico, EnricoChen, LeeChergui, MajedOthon, Christina MFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06369https://cds.cern.ch/record/2200974['arXiv:1607.06369']arXiv:1607.06369Density redistribution effects in fermionic optical lattices
https://cds.cern.ch/record/2200973
We simulate a one dimensional fermionic optical lattice to analyse heating due to non-adiabatic lattice loading. Our simulations reveal that, similar to the bosonic case, density redistribution effects are the major cause of heating in harmonic traps. We suggest protocols to modulate the local density distribution during the process of lattice loading, in order to reduce the excess energy. Our numerical results confirm that linear interpolation of the trapping potential and/or the interaction strength is an efficient method of doing so, bearing practical applications relevant to experiments.Soni, MedhaDolfi, MicheleTroyer, MatthiasFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06352https://cds.cern.ch/record/2200973['arXiv:1607.06352']arXiv:1607.06352The effect of surface transport on water desalination by porous electrodes undergoing capacitive charging
https://cds.cern.ch/record/2200972
Capacitive deionization (CDI) is a technology in which water is desalinated by ion electrosorption into the electric double layers (EDLs) of charging porous electrodes. In recent years significant advances have been made in modeling the charge and salt dynamics in a CDI cell, but the possible effect of surface transport within diffuse EDLs on these dynamics has not been investigated. We here present theory which includes surface transport in describing the dynamics of a charging CDI cell. Through our numerical solution to the presented models, the possible effect of surface transport on the CDI process is elucidated. While at some model conditions surface transport enhances the rate of CDI cell charging, counter-intuitively this additional transport pathway is found to slow down cell charging at other model conditions.Shocron, Amit NSuss, Matthew EFri, 22 Jul 2016 05:41:44 GMT21 Jul 2016arXiv:1607.06350https://cds.cern.ch/record/2200972['arXiv:1607.06350']arXiv:1607.06350Electron impact excitation of F-like W LXVI
https://cds.cern.ch/record/2200971
Electron impact excitation collision strengths are calculated for all transitions among 113 levels of the 2s$^2$2p$^5$, 2s2p$^6$, 2s$^2$2p$^4$3$\ell$, 2s2p$^5$3$\ell$, and 2p$^6$3$\ell$ configurations of F-like W~LXVI. For this purpose Dirac Atomic R-matrix Code (DARC) has been adopted and results are listed over a wide energy range of 1000 to 6000 Ryd. For comparison purpose analogous calculations have also been performed with the Flexible Atomic Code (FAC), and the results obtained are comparable with those from DARC.Aggarwal, K MFri, 22 Jul 2016 05:41:43 GMT21 Jul 2016arXiv:1607.06348https://cds.cern.ch/record/2200971['arXiv:1607.06348']arXiv:1607.06348Seasonal and geographical influence on sleeping patterns inferred from mobile phone data
https://cds.cern.ch/record/2200970
Influence of the sunrise, sunset and daylight on the human sleep wake cycle has been primarily studied using questionnaires from limited size cohorts. The studies indicate that it varies along the year while the sunrise and sunset could be related with the onset and conclusion of sleep. Here, we take an empirical data-driven approach by utilizing anonymized mobile phone data or "digital footprints" of very large size cohort during a year. Using aggregated calling patterns we construct the distributions for the daily first and last calls in different cities along the year. We also characterize a daily period of low calling activity that allows to infer the dependence of the sleep-wake cycle on geographical location and the seasonal changes. We find rather surprisingly that the mobile phone users synchronize their last and first calls with the local sun transit time along the longitude they are located. Further analysis reveals that the difference between the durations of the low activity period in the summer and the winter is governed by the latitude of the users' domiciles, such that people in the southern cities experience a time difference almost twice as large as the people in cities located 8 degrees to the north. Finally, we argue that the synchronization of the onset and the middle of the period of low calling activity in cities is entrained by sun-based clocks with the solar noon (or solar midnight) being the most plausible candidate for this pacemaking.Monsivais, DanielBhattacharya, KunalGhosh, AsimKaski, KimmoFri, 22 Jul 2016 05:41:43 GMT21 Jul 2016arXiv:1607.06341https://cds.cern.ch/record/2200970['arXiv:1607.06341']arXiv:1607.06341Deterministic light focusing in space and time through multiple scattering media with a Time-Resolved Transmission Matrix approach
https://cds.cern.ch/record/2200969
We report a method to characterize the propagation of an ultrashort pulse of light through a multiple scattering medium by measuring its time-resolved transmission matrix. This method is based on the use of a spatial light modulator together with a coherent time-gated detection of the transmitted speckle field. Using this matrix, we demonstrate the focusing of the scattered pulse at any arbitrary position in space and time after the medium. Our approach opens new perspectives for both fundamental studies and applications in imaging and coherent control in disordered media.Mounaix, MickaelDefienne, HugoGigan, SylvainFri, 22 Jul 2016 05:41:43 GMT21 Jul 2016arXiv:1607.06331https://cds.cern.ch/record/2200969['arXiv:1607.06331']arXiv:1607.06331Localization phenomena in interacting Rydberg lattice gases with position disorder
https://cds.cern.ch/record/2200968
Disordered systems provide paradigmatic instances of ergodicity breaking and localization phenomena. Here we explore the dynamics of excitations in a system of Rydberg atoms held in optical tweezers. The finite temperature produces an intrinsic uncertainty in the atomic positions, which translates into quenched correlated disorder in the interatomic interaction strengths. In a simple approach, the dynamics in the many-body Hilbert space can be understood in terms of a one-dimensional Anderson-like model with disorder on every other site, featuring both localized and delocalized states. We conduct an experiment on an eight-atom chain and observe a clear suppression of excitation transfer. Our experiment accesses a regime which is described by a two-dimensional Anderson model on a "trimmed" square lattice. Our results thus provide a concrete example in which the absence of excitation propagation in a many-body system is directly related to Anderson-like localization in the Hilbert space, which is believed to be the mechanism underlying many-body localization.Marcuzzi, MatteoMinář, JiříBarredo, Danielde Léséleuc, SylvainLabuhn, HenningLahaye, ThierryBrowaeys, AntoineLevi, EmanueleLesanovsky, IgorFri, 22 Jul 2016 05:41:43 GMT21 Jul 2016arXiv:1607.06295https://cds.cern.ch/record/2200968['arXiv:1607.06295']arXiv:1607.06295Point patterns occurring on complex structures in space and space-time: An alternative network approach
https://cds.cern.ch/record/2200967
This paper presents an alternative approach of analyzing possibly multitype point patterns in space and space-time that occur on network structures, and introduces several different graph-related intensity measures. The proposed formalism allows to control for processes on undirected, directional as well as partially directed network structures and is not restricted to linearity or circularity.Eckardt, MatthiasMateu, JorgeFri, 22 Jul 2016 05:41:43 GMT21 Jul 2016arXiv:1607.06288https://cds.cern.ch/record/2200967['arXiv:1607.06288']arXiv:1607.06288Interfacing superconducting qubits and single optical photons
https://cds.cern.ch/record/2200966
We propose an efficient light-matter interface at optical frequencies between a superconducting qubit and a single photon. The desired interface is based on a hybrid architecture composed of an organic molecule embedded inside an optical waveguide and electrically coupled to a superconducting qubit far from the optical axis. We show that high fidelity, photon-mediated, entanglement between distant superconducting qubits can be achieved with incident pulses at the single photon level. Such low light level is highly sought for to overcome the decoherence of the superconducting qubit caused by absorption of optical photons.Das, SumantaFaez, SanliSørensen, Anders SFri, 22 Jul 2016 05:41:43 GMT21 Jul 2016arXiv:1607.06271https://cds.cern.ch/record/2200966['arXiv:1607.06271']arXiv:1607.06271