202,827 research outputs found
How quickly can anyons be braided? Or: How I learned to stop worrying about diabatic errors and love the anyon
Topological phases of matter are a potential platform for the storage and
processing of quantum information with intrinsic error rates that decrease
exponentially with inverse temperature and with the length scales of the
system, such as the distance between quasiparticles. However, it is less
well-understood how error rates depend on the speed with which non-Abelian
quasiparticles are braided. In general, diabatic corrections to the holonomy or
Berry's matrix vanish at least inversely with the length of time for the braid,
with faster decay occurring as the time-dependence is made smoother. We show
that such corrections will not affect quantum information encoded in
topological degrees of freedom, unless they involve the creation of
topologically nontrivial quasiparticles. Moreover, we show how measurements
that detect unintentionally created quasiparticles can be used to control this
source of error.Comment: 33 pages, 18 figures, version 3: extended results to general anyon
braidin
Two-Timescale Learning Using Idiotypic Behaviour Mediation For A Navigating Mobile Robot
A combined Short-Term Learning (STL) and Long-Term Learning (LTL) approach to
solving mobile-robot navigation problems is presented and tested in both the
real and virtual domains. The LTL phase consists of rapid simulations that use
a Genetic Algorithm to derive diverse sets of behaviours, encoded as variable
sets of attributes, and the STL phase is an idiotypic Artificial Immune System.
Results from the LTL phase show that sets of behaviours develop very rapidly,
and significantly greater diversity is obtained when multiple autonomous
populations are used, rather than a single one. The architecture is assessed
under various scenarios, including removal of the LTL phase and switching off
the idiotypic mechanism in the STL phase. The comparisons provide substantial
evidence that the best option is the inclusion of both the LTL phase and the
idiotypic system. In addition, this paper shows that structurally different
environments can be used for the two phases without compromising
transferability.Comment: 40 pages, 12 tables, Journal of Applied Soft Computin
Surface roughness modeling of CBN hard steel turning
Study in the paper investigate the influence of the cutting conditions parameters on surface roughness parameters during turning of hard steel with cubic boron nitrite cutting tool insert. For the modeling of surface roughness parameters was used central compositional design of experiment and artificial neural network as well. The values of surface roughness parameters Average mean arithmetic surface roughness (Ra) and Maximal surface roughness (Rmax) were predicted by this two-modeling methodology and determined models were then compared. The results showed that the proposed systems can significantly increase the accuracy of the product profile when compared to the conventional approaches. The results indicate that the design of experiments modeling technique and artificial neural network can be effectively used for the prediction of the surface roughness parameters of hard steel and determined significantly influential cutting conditions parameters
Design of obstacle detection and avoidance system for GUANAY II AUV
Postprint (published version
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