204 research outputs found
Decoherence of encoded quantum registers
In order to eliminate disturbing effects of decoherence, encoding of quantum
information in decoherence-free subspaces has been suggested. We analyze the
benefits of this concept for a quantum register that is realized in a spin
chain in contact with a common bosonic bath. Within a dissipation-less model we
provide explicit analytical results for the average fidelity of plain and
encoded quantum registers. For the investigation of dissipative spin-boson
couplings we employ a master equation of Bloch-Redfield type.Comment: 13 pages, 9 figure
Distance dependence of entanglement generation via a bosonic heat bath
Within a generalized Caldeira-Leggett model we analyze the conditions under
which a bosonic heat bath can entangle two microscopic quantum systems at a
distance . We find that the attainable entanglement is extremely
distance-sensitive. Significant entanglement can only be achieved if the
systems are within a {\em microscopic} distance that is of order of the cut-off
wavelength of the system-bath interaction. At larger distances the
maximal entanglement is exponentially suppressed with a decay length of order
. We conclude that entanglement generation via a heat bath is not
suitable for entangling remote objects.Comment: 4 pages, 3 figures, new title, final version to appear in Phys. Rev.
Let
Quantum Error Correction in Spatially Correlated Quantum Noise
We consider quantum error correction of quantum-noise that is created by a
local interaction of qubits with a common bosonic bath. The possible exchange
of bath bosons between qubits gives rise to spatial and temporal correlations
in the noise. We find that these kind of noise correlations have a strong
negative impact on quantum error correction.Comment: 4 pages, 1 figure, final version with minor correction
The SWAP EUV Imaging Telescope Part I: Instrument Overview and Pre-Flight Testing
The Sun Watcher with Active Pixels and Image Processing (SWAP) is an EUV
solar telescope on board ESA's Project for Onboard Autonomy 2 (PROBA2) mission
launched on 2 November 2009. SWAP has a spectral bandpass centered on 17.4 nm
and provides images of the low solar corona over a 54x54 arcmin field-of-view
with 3.2 arcsec pixels and an imaging cadence of about two minutes. SWAP is
designed to monitor all space-weather-relevant events and features in the low
solar corona. Given the limited resources of the PROBA2 microsatellite, the
SWAP telescope is designed with various innovative technologies, including an
off-axis optical design and a CMOS-APS detector. This article provides
reference documentation for users of the SWAP image data.Comment: 26 pages, 9 figures, 1 movi
Quantum Graphs: A simple model for Chaotic Scattering
We connect quantum graphs with infinite leads, and turn them to scattering
systems. We show that they display all the features which characterize quantum
scattering systems with an underlying classical chaotic dynamics: typical
poles, delay time and conductance distributions, Ericson fluctuations, and when
considered statistically, the ensemble of scattering matrices reproduce quite
well the predictions of appropriately defined Random Matrix ensembles. The
underlying classical dynamics can be defined, and it provides important
parameters which are needed for the quantum theory. In particular, we derive
exact expressions for the scattering matrix, and an exact trace formula for the
density of resonances, in terms of classical orbits, analogous to the
semiclassical theory of chaotic scattering. We use this in order to investigate
the origin of the connection between Random Matrix Theory and the underlying
classical chaotic dynamics. Being an exact theory, and due to its relative
simplicity, it offers new insights into this problem which is at the fore-front
of the research in chaotic scattering and related fields.Comment: 28 pages, 13 figures, submitted to J. Phys. A Special Issue -- Random
Matrix Theor
Wave-packet dynamics at the mobility edge in two- and three-dimensional systems
We study the time evolution of wave packets at the mobility edge of
disordered non-interacting electrons in two and three spatial dimensions. The
results of numerical calculations are found to agree with the predictions of
scaling theory. In particular, we find that the -th moment of the
probability density scales like in dimensions. The
return probability scales like , with the generalized
dimension of the participation ratio . For long times and short distances
the probability density of the wave packet shows power law scaling
. The numerical calculations were performed
on network models defined by a unitary time evolution operator providing an
efficient model for the study of the wave packet dynamics.Comment: 4 pages, RevTeX, 4 figures included, published versio
Spectral Compressibility at the Metal-Insulator Transition of the Quantum Hall Effect
The spectral properties of a disordered electronic system at the
metal-insulator transition point are investigated numerically. A recently
derived relation between the anomalous diffusion exponent and the
spectral compressibility at the mobility edge, , is
confirmed for the integer quantum Hall delocalization transition. Our
calculations are performed within the framework of an unitary network-model and
represent a new method to investigate spectral properties of disordered
systems.Comment: 5 pages, RevTeX, 3 figures, Postscript, strongly revised version to
be published in PR
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