1,062 research outputs found
Recent Developments in Parallelization of the Multidimensional Integration Package DICE
DICE is a general purpose multidimensional numerical integration package.
There can be two ways in the parallelization of DICE, "distributing random
numbers into workers" and "distributing hypercubes into workers". Furthermore,
there can be the combination of both ways. So far, we had developed the
parallelization code using the former way and reported it in ACAT2002 in
Moscow. Here, we will present the recent developments of parallelized DICE in
the latter way as the 2nd stage of our parallelization activities.Comment: 5 pages, 2 figures, Talk given at the X International Workshop on
Advanced Computing and Analysis Techniques in Physics Research, ACAT 2005,
DESY-Zeuthen, Germany, 22-27 May 200
A Feynman graph selection tool in GRACE system
We present a Feynman graph selection tool {\tt grcsel}, which is an
interpreter written in C language. In the framework of {\tt GRACE}, it enables
us to get a subset of Feynman graphs according to given conditions.Comment: 3 pages, 2 figures, Latex, ACAT200
Extraction of an Entanglement by Repetition of the Resonant Transmission of an Ancilla Qubit
A scheme for the extraction of entanglement in two noninteracting qubits
(spins) is proposed. The idea is to make use of resonant transmission of
ancilla qubit through the two fixed qubits, controlled by the entanglement in
the scatterers. Repetition of the resonant transmission extracts the singlet
state in the target qubits from their arbitrary given state. Neither the
preparation nor the post-selection of the ancilla spin is required, in contrast
to the previously proposed schemes.Comment: 14 pages, 7 figure
Boson Fusion and Higgs production at the LHC in six fermion final states with one charged lepton pair
Boson boson scattering and Higgs production in boson boson fusion will be
actively investigated at the LHC. We have performed a parton level study of all
processes of the type using for the first
time a full fledged six fermion Monte Carlo event generator which employs exact
matrix elements at \O(\alpha_{em}^6). We have examined Higgs production in
vector boson fusion followed by the decay chain ,
including exactly all electroweak irreducible backgrounds. In the high mass
region we have compared the case of a relatively light Higgs with the no-Higgs
case. The integrated cross section for the latter case is more than twice that
in the former for a minimum invariant mass of the pair of about 800 \GeV.
We find, in a preliminary anlysis at parton level that, summing up the muon and
the electron channels, about 30 events are expected in the light Higgs case for
L=100 .Comment: Final version published in Phys.Rev.
Entanglement-assisted tomography of a quantum target
We study the efficiency of quantum tomographic reconstruction where the
system under investigation (quantum target) is indirectly monitored by looking
at the state of a quantum probe that has been scattered off the target. In
particular we focus on the state tomography of a qubit through a
one-dimensional scattering of a probe qubit, with a Heisenberg-type
interaction. Via direct evaluation of the associated quantum Cram\'{e}r-Rao
bounds, we compare the accuracy efficiency that one can get by adopting
entanglement-assisted strategies with that achievable when entanglement
resources are not available. Even though sub-shot noise accuracy levels are not
attainable, we show that quantum correlations play a significant role in the
estimation. A comparison with the accuracy levels obtainable by direct
estimation (not through a probe) of the quantum target is also performed.Comment: 22 pages, 9 figure
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