784 research outputs found
Scaling the neutral atom Rydberg gate quantum computer by collective encoding in Holmium atoms
We discuss a method for scaling a neutral atom Rydberg gate quantum processor
to a large number of qubits. Limits are derived showing that the number of
qubits that can be directly connected by entangling gates with errors at the
level using long range Rydberg interactions between sites in an
optical lattice, without mechanical motion or swap chains, is about 500 in two
dimensions and 7500 in three dimensions. A scaling factor of 60 at a smaller
number of sites can be obtained using collective register encoding in the
hyperfine ground states of the rare earth atom Holmium. We present a detailed
analysis of operation of the 60 qubit register in Holmium. Combining a lattice
of multi-qubit ensembles with collective encoding results in a feasible design
for a 1000 qubit fully connected quantum processor.Comment: 6 figure
Elastic Scattering Amplitude at 1.8 TeV and Determination of Total Cross Section
The data on p elastic scattering at 1.8 and 1.96 TeV are
analysed in terms of real and imaginary amplitudes, in a treatment with high
accuracy, covering the whole t-range and satisfying the expectation of
dispersion relation for amplitudes and for slopes. A method is introduced for
determination of the total cross section and the other forward scattering
parameters and to check compatibility of E-710, CDF and the recent D0 data.
Slopes and of the real and imaginary amplitudes, treated as
independent quantities, influence the amplitudes in the whole t-range and are
important for the determination of the total cross section. The amplitudes are
fully constructed, and a prediction is made of a marked dip in in
the range 3 - 5 GeV due to the universal contribution of the process
of three gluon exchange.Comment: 22 pages, 12 figures, 2 table
A Seriuos Academic Work
С.А. Кравченко «Социологический толковый англо-русский словарь». М.: МГИМО(У) МИД России, 2012. 690 с. (Серия «Энциклопедии и словари МГИМО(У)»)
Langmuir-Schaefer films of a polyaniline-gold nanoparticle composite material for applications in organic memristive devices
Langmuir-Shaefer films of a polyaniline-gold nanoparticle composite were fabricated and characterized. The thickness of each deposited monolayer, determined with AFM, was found to be about 0.8 nm. The film morphology was studied by SEM, revealing the presence of embedded spherical-shaped gold nanoparticles of about 5-10 nm in diameter. The fabricated films were used as the active channel of the organic memristor. Its electric characterisation has revealed new phenomena, such as an increased working voltage range and sigmoidal voltage current characteristics that were connected to the charge trappin
Renormalization Group Theory for a Perturbed KdV Equation
We show that renormalization group(RG) theory can be used to give an analytic
description of the evolution of a perturbed KdV equation. The equations
describing the deformation of its shape as the effect of perturbation are RG
equations. The RG approach may be simpler than inverse scattering theory(IST)
and another approaches, because it dose not rely on any knowledge of IST and it
is very concise and easy to understand. To the best of our knowledge, this is
the first time that RG has been used in this way for the perturbed soliton
dynamics.Comment: 4 pages, no figure, revte
Formation of Nanoclusters and Nanopillars in Nonequilibrium Surface Growth for Catalysis Applications: Growth by Diffusional Transport of Matter in Solution Synthesis
Growth of nanoclusters and nanopillars is considered in a model of surface
deposition of building blocks (atoms) diffusionally transported from solution
to the forming surface structure. Processes of surface restructuring are also
accounted for in the model, which then yields morphologies of interest in
catalysis applications. Kinetic Monte Carlo numerical approach is utilized to
explore the emergence of FCC-symmetry surface features in Pt-type metal
nanostructures. Available results exemplify evaluation of the fraction of the
resulting active sites with desirable properties for catalysis, such as
(111)-like coordination, as well as suggest optimal growth regimes
Photon echoes generated by reversing magnetic field gradients in a rubidium vapour
We propose a photon echo quantum memory scheme using detuned Raman coupling
to long lived ground states. In contrast to previous 3-level schemes based on
controlled reversible inhomogeneous broadening that use sequences of
-pulses, the scheme does not require accurate control of the coupling
dynamics to the ground states. We present a proof of principle experimental
realization of our proposal using rubidium atoms in a warm vapour cell. The
Raman resonance line is broadened using a magnetic field that varies linearly
along the direction of light propagation. Inverting the magnetic field gradient
rephases the atomic dipoles and re-emits the light pulse in the forward
direction
Spectrum Estimation of Density Operators with Alkaline-Earth Atoms
We show that Ramsey spectroscopy of fermionic alkaline-earth atoms in a square-well trap provides an efficient and accurate estimate for the eigenspectrum of a density matrix whose n copies are stored in the nuclear spins of n such atoms. This spectrum estimation is enabled by the high symmetry of the interaction Hamiltonian, dictated, in turn, by the decoupling of the nuclear spin from the electrons and by the shape of the square-well trap. Practical performance of this procedure and its potential applications to quantum computing and time keeping with alkaline-earth atoms are discussed
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