96 research outputs found
Creating Bell states and decoherence effects in quantum dots system
We show how to improve the efficiency for preparing Bell states in coupled
two quantum dots system. A measurement to the state of driven quantum laser
field leads to wave function collapse. This results in highly efficiency
preparation of Bell states. The effect of decoherence on the efficiency of
generating Bell states is also discussed in this paper. The results show that
the decoherence does not affect the relative weight of and in the
output state, but the efficiency of finding Bell states.Comment: 4 pages, 2figures, corrected some typo
Entanglement of two-mode Bose-Einstein condensates
We investigate the entaglement characteristics of two general bimodal
Bose-Einstein condensates - a pair of tunnel-coupled Bose-Einstein condensates
and the atom-molecule Bose-Einstein condensate. We argue that the entanglement
is only physically meaningful if the system is viewed as a bipartite system,
where the subsystems are the two modes. The indistinguishibility of the
particles in the condensate means that the atomic constituents are physically
inaccessible and thus the degree of entanglement between individual particles,
unlike the entanglement between the modes, is not experimentally relevant so
long as the particles remain in the condensed state. We calculate the
entanglement between the modes for the exact ground state of the two bimodal
condensates and consider the dynamics of the entanglement in the tunnel-coupled
case.Comment: 11 pages, 8 figures, submitted to Physical Review A, to be presented
at the third UQ Mathematical Physics workshop, Oct. 4-6; changes made in
response to referee comment
Many particle entanglement in two-component Bose-Einstein Condensates
We investigate schemes to dynamically create many particle entangled states
of a two component Bose-Einstein condensate in a very short time proportional
to 1/N where is the number of condensate particles. For small we
compare exact numerical calculations with analytical semiclassical estimates
and find very good agreement for . We also estimate the effect of
decoherence on our scheme, study possible scenarios for measuring the entangled
states, and investigate experimental imperfections.Comment: 12 pages, 8 figure
The effect of minimum quantity lubrication in the intermittent turning of magnesium based on vibration signals
The present work shows an experimental investigation on intermittent turning based on vibration signals.
The dependence of vibrations on the feed rate, minimum quantity lubrication (MQL) flow rate and the type of the
interruption of the workpiece is evaluated. The results indicate that a part of the vibrations depends on the flow rate
of the MQL system and its interaction with the feed rate, finding no dependency on the type of interruption. The
influence of the MQL system is greater when machining at the lower feed rate. In addition, a strong relation between
surface roughness and vibrations is identified. However, this relation is quite different depending on the environment
used. In general, under dry conditions, the higher the vibrations the higher the surface roughness, while the opposite
occurs when the MQL system is used.publishe
Ultra-High-Speed Optical Serial-to-Parallel Data Conversion in a Silicon Nanowire
We demonstrate conversion from 64×10 Gbit/s OTDM to 25 GHz DWDM by time-domain optical Fourier transformation. Using a single silicon nanowire, 40 of 64 OTDM tributaries are simultaneously converted to DWDM channels within FEC limits.</p
Serial turbo decoder for robust communication
A new serial turbo decoder for robust communication in the presence of impulsive noise is proposed and examined. The new decoder iteratively performs robust maximum a posteriori (MAP) decoding by cascading a nonlinear MAP inner decoder incorporating a non-quadratic penalty function with an MAP outer decoder. Results show that the proposed serial turbo decoder facilitates considerable performance improvement
234 Identification and clinical outcomes of aristolochic acid-induced upper tract urothelial carcinoma
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