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Submegahertz spectral width photon pair source based on fused silica microspheres

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Photonics Research 2021年第11期9卷 2237-2252页

作者： ERASTO ORTIZ-RICARDO CESAR bERTONI-OCAMPO MONICA MALDONADO-TERRON ARTuRO GARCIA ZuRITA RObERTO RAMIREZ-ALARCON HECTOR CRuZ RAMIREZ R.CASTRO-bELTRAN ALFRED b.u’REN Instituto de Ciencias Nucleares Universidad Nacional Autonoma de MexicoApartado Postal 70-54304510 MexicoD.F.Mexico Centro de Investigaciones en Optica A.C. Loma del Bosque 115Colonia Lomas del Campestre37150 LeonGuanajuatoMexico Departamento de Ingenieria Fisica Cuerpo Academico de Mecanica EstadisticaDivison de Ciencias e IngenieriasUniversidad de Guanajuato37150 LeonGuanajuatoMexico

High-efficiency submegahertz bandwidth photon pair generators will enable the field of quantum technology to transition from laboratory demonstrations to transformational applications involving information transfer from photons to *** spontaneous parametric processes are able to achieve high-efficiency photon pair generation,the spectral bandwidth tends to be relatively large,as defined by phase-matching *** solve this fundamental limitation,we use an ultrahigh quality factor(Q)fused silica microsphere resonant cavity to form a photon pair *** present the full theory for the spontaneous four-wave mixing(SFWM)process in these devices,fully taking into account all relevant source characteristics in our *** exceptionally narrow(down to kilohertz-scale)linewidths of these devices result in a reduction in the bandwidth of the photon pair generation,allowing submegahertz spectral bandwidth to be ***,using a pump source centered around 1550 nm,photon pairs with the signal and idler modes at wavelengths close to 1540 and 1560 nm,respectively,are *** herald a single idler-mode photon by detecting the corresponding signal photon,filtered via transmission through a wavelength division multiplexing channel of *** demonstrate the extraction of the spectral profile of a single peak in the single-photon frequency comb from a measurement of the signal–idler time of emission *** improvements in device design and experimental methods enabled the narrowest spectral width(Δν=366 k Hz)to date in a heralded single-photon source based on SFWM.

关键词： fused silica spectral

Identification of high-dielectric constant compounds from statistical design

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npj Computational Materials 2022年第1期8卷 1396-1405页

作者： Abhijith Gopakumar Koushik pal Chris Wolverton Department of Materials Science and Engineering Northwestern University2220 Campus DriveEvanstonIL60208USA

The discovery of high-dielectric materials is crucial to increasing the efficiency of electronic devices and ***,we report three previously unexplored materials with very high dielectric constants(69band gaps(2.9btained by screening materials databases using statistical optimization algorithms aided by artificial neural networks(ANN).Two of these new dielectrics are mixed-anion compounds(Eu_(5)siCl_(6)O_(4)and HoClO)and are shown to be thermodynamically stable against common semiconductors via phase diagram *** also uncovered four other materials with relatively large dielectric constants(20band gaps(2.3btained from the Materials Project,the search-space consists of materials from the Open Quantum Materials Database(OQMD)—demonstrating a successful implementation of cross-database materials ***,we report the dielectric properties of 17 materials calculated using ab initio calculations,that were selected in our design *** dielectric materials with high-dielectric properties predicted in this work open up further experimental research opportunities.

关键词： dielectric high constant

Microscopic mechanism of unusual lattice thermal transport in TlInTe_(2)

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npj Computational Materials 2021年第1期7卷 1-8页

作者： Koushik pal Yi Xia Chris Wolverton Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA

We investigate the microscopic mechanism of ultralow lattice thermal conductivity(κl)of TlInTe_(2)and its weak temperature dependence using a unified theory of lattice heat transport,that considers contributions arising from the particle-like propagation as well as wave-like tunneling of *** we use the Peierls–boltzmann transport equation(PbTE)to calculate the particlelike contributions(κl(PbTE)),we explicitly calculate the off-diagonal(OD)components of the heat-flux operator within a firstprinciples density functional theory framework to determine the contributions(κl(OD))arising from the wave-like tunneling of *** each temperature,T,we anharmonically renormalize the phonon frequencies using the self-consistent phonon theory including quartic anharmonicity,and utilize them to calculateκl(PbTE)andκl(OD).With the combined inclusion ofκl(PbTE),κl(OD),and additional grain-b.undary scatterings,our calculations successfully reproduce the experimental *** analysis shows that large quartic anharmonicity of TlInTe_(2)(a)strongly hardens the low-energy phonon branches,(b)diminishes the three-phonon scattering processes at finite T,and(c)recovers the weaker than T^(−1) decay of the measuredκl.

关键词： lattice phonon harmonic

Resonant production of color octet muons at Future Circular Collider-based muon-proton colliders

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Chinese Physics C 2018年第8期42卷 99-107页

作者： Y.C.Acar u.Kaya b.b.Oner Department of Material Science and Nanotechnology TOBB University of Economics and Technology Department of Physics Ankara University

We investigate the resonant production of color octet muons in order to explore the discovery potential of Future Circular Collider（FCC）-based μp *** is shown that the search potentials of μp colliders essentially... 详细信息

关键词： leptogluons lepton-hadron interactions composite models muon-proton colliders color octet muon,beyond the standard model

Safety Control of a Class of Fully Actuated Systems Subject to uncertain Actuation Dynamics

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Journal of Systems Science & Complexity 2022年第2期35卷 543-558页

作者： Wu si LIu Tengfei State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110004China

Safety is an essential requirement for control ***,controlled mobile robots are subject to safety constraints,to which control laws in typical forms may not be directly *** paper employs barrier function to describe safety constraints,analyzes the interaction between the barrier function and the uncertain actuation dynamics by employing the ideas of interconnected systems,and proposes a quadratic-programming-based integration of the control algorithms subject to the safety constraint for a class of fully actuated systems.

关键词： Dynamic uncertainties fully-actuated systems safety control

Study of nucleon-nucleon and alphanucleon elastic scattering by the Manning-Rosen potential

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Communications in Theoretical Physics 2020年第7期72卷 60-64页

作者： A K behera J bhoi u Laha b Khirali Department of Physics National Institute of TechnologyJamshedpur831014India Department of Physics Veer Surendra Sai University of TechnologyBurla-768018OdishaIndia

Although often used in molecular dynamics,in this work the Manning-Rosen potential is parameterized to compute the scattering phase shifts for the nucleon-nucleon and the alphanucleon systems by exploiting the standard phase function *** obtain excellent agreement in phase shifts with the more sophisticated calculations up to partial waves l=2.

关键词： phase function method Manning-Rosen potential scattering phase shifts nucleon-nucleon and the alpha-nucleon systems

A carbuncle cure for the Harten-Lax-van Leer contact(HLLC)scheme using a novel velocity-based sensor

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Applied Mathematics and Mechanics(English Edition) 2021年第9期42卷 1259-1278页

作者： u.S.VEVEK b.ZANG T.H.NEW Department of Mechanical Materials and Aerospace EngineeringUniversity of LiverpoolLiverpool L693BXUnited Kingdom Department of Aerospace Engineering University of BristolBristol BS81TRUnited Kindgdom School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

A hybrid numerical flux scheme is proposed by adapting the carbunclefree modified Harten-Lax-van Leer contact(HLLCM) scheme to smoothly revert to the Harten-Lax-van Leer contact(HLLC) scheme in regions of shear. This hybrid scheme, referred to as the HLLCT scheme, employs a novel, velocity-based shear sensor. In contrast to the non-local pressure-based shock sensors often used in carbuncle cures, the proposed shear sensor can be computed in a localized manner meaning that the HLLCT scheme can be easily introduced into existing codes without having to implement additional data structures. Through numerical experiments, it is shown that the HLLCT scheme is able to resolve shear layers accurately without succumbing to the shock instability.

关键词： carbuncle shock instability Euler equation numerical flux Harten-Laxvan Leer contact(HLLC)scheme

A Result on Fractional(a,b,k)-critical Covered Graphs

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Acta Mathematicae Applicatae sinica 2021年第4期37卷 657-664页

作者： si-zhong ZHOu School of Science Jiangsu University of Science and TechnologyZhenjiang212100China

A fractional[a,b]-factor of a graph G is a function h from E(G)to[0,1]satisfying a≤d^(h)_(G)(v)≤b for every vertex v of G,where d^(h)_(G)(v)=∑e∈E(v)h(e)and E(v)={e=uv:u∈V(G)}.A graph G is called fractional[a,b]-covered if G contains a fractional[a,b]-factor h with h(e)=1 for any edge e of G.A graph G is called fractional(a,b,k)-critical covered if G—Q is fractional[a,b]-covered for any Q⊆V(G)with∣Q∣=*** this article,we demonstrate a neighborhood condition for a graph to be fractional(a,b,k)-critical ***,we claim that the result is sharp.

关键词： graph neighborhood fractional[a,6]-factor fractional[a.6]-covered graph fractional(a.b,k)-critical covered graph

Inter-relationship of Various Results in Analysis of （14.0 MeV／u） Pb＋Pb Reaction using Mica and CN-85 Track Detectors

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Chinese Physics Letters 2005年第1期22卷 69-71页

作者： F.N.Khattak E.u.Khan TabassumNasir J.J.baluch F.u.Khan u.W.C. GomalUniversityDeraIsmailKhanPakistan RadiationPhysicsDivision PINSTECHNiloreIslamabadPakistan DepartmentofPhysics GomalUniversityDeraIsmailKhanPakistan

Two detector materials mica and cellulose-nitrate(CN)-85 have been used to study (14.0MeV/u) Pb + Pb reaction. Events of different multiplicities were registered in mica and CN-85 detectors using the 2π-geometry technique of solid state nuclear track detection. After removing the target material from the detectors the damaged trails in the detectors were revealed as tracks by proper chemical etching. The irradiated area of each sample was scanned and events of different multiplicities were traced. The binary events were bifurcated into elastic and inelastic events. The elastic binary events and three prong events, observed in the reaction, have been used to search out coefficients Cμν in the presence of both the detectors, for the reaction under study. using these coefficients 3- and 4-prong events have been analysed. From the detailed analysis of the results of (14.0MeV/u) Pb+Pb reaction, obtained from mica and CN-85 track detectors we observed a great resemblance of results obtained from the two detectors. Combining the results of both the detectors, we report some important outcomes.

关键词： CN-85轨迹探测器高能物理学铅原子碰撞反应固态