2,939 research outputs found
Quantum dense coding scheme via cavity decay
We investigate a secure scheme for implementing quantum dense coding via
cavity decay and liner optics devices. Our scheme combines two distinct
advantages: atomic qubit sevres as stationary bit and photonic qubit as flying
bit, thus it is suitable for long distant quantum communication.Comment: 5 pages, 2 figure. A revised version, accept for publication in
Journal of Modern Optc
Half-Metallic Silicon Nanowires: Multiple Surface Dangling Bonds and Nonmagnetic Doping
By means of first-principles density functional theory calculations, we find
that hydrogen-passivated ultrathin silicon nanowires (SiNWs) along [100]
direction with symmetrical multiple surface dangling bonds (SDBs) and boron
doping can have a half-metallic ground state with 100% spin polarization, where
the half-metallicity is shown quite robust against external electric fields.
Under the circumstances with various SDBs, the H-passivated SiNWs can also be
ferromagnetic or antiferromagnetic semiconductors. The present study not only
offers a possible route to engineer half-metallic SiNWs without containing
magnetic atoms but also sheds light on manipulating spin-dependent properties
of nanowires through surface passivation.Comment: 4 pages, 5 figure
Generation of cluster states
We propose two schemes for the generation of the cluster states. One is based
on cavity quantum electrodynamics (QED) techniques. The scheme only requires
resonant interactions between two atoms and a single-mode cavity. The
interaction time is very short, which is important in view of decoherence.
Furthermore, we also discuss the cavity decay and atomic spontaneous emission
case. The other is based on atomic ensembles. The scheme has inherent fault
tolerance function and is robust to realistic noise and imperfections. All the
facilities used in our schemes are well within the current technology.Comment: Complete rewite version, adding the main results of quant-ph/0511045.
7 pages and 3 figure
The Study on Factors Influencing Personal Internet Banking Customers’ Loyalty
Customers’ Loyalty is important to internet banking. Customers’ Loyalty is not only involved in the survival of internet banking,but also the revenue of intenet banking.This paper studies the factors influencing personal internet banking customers’ loyalty. The model of loyalty of internet banking is constructed on the basis of theoretical research and china’s reality. And the model is tested by LISREL8.7 and SPSS17.0
Thermoelectric Properties of Silicon Carbide Nanowires with Nitrogen Dopants and Vacancies
The thermoelectric properties of cubic zincblend silicon carbide nanowires
(SiCNWs) with nitrogen impurities and vacancies along [111] direction are
theoretically studied by means of atomistic simulations. It is found that the
thermoelectric figure of merit ZT of SiCNWs can be significantly enhanced by
doping N impurities together with making Si vacancies. Aiming at obtaining a
large ZT, we study possible energetically stable configurations, and disclose
that, when N dopants locate at the center, a small number of Si vacancies at
corners are most favored for n-type nanowires, while a large number of Si
vacancies spreading into the flat edge sites are most favored for p-type
nanowires. For the SiCNW with a diameter of 1.1 nm and a length of 4.6 nm, the
ZT value for the n-type is shown capable of reaching 1.78 at 900K. The
conditions to get higher ZT values for longer SiCNWs are also addressed.Comment: 9 pages, 10 figure
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