6,717 research outputs found
High photon number path entanglement in the interference of spontaneously downconverted photon pairs with coherent laser light
We show that the quantum interference between downconverted photon pairs and
photons from coherent laser light can produce a maximally path entangled
N-photon output component with a fidelity greater than 90% for arbitrarily high
photon numbers. A simple beam splitter operation can thus transform the
2-photon coherence of down-converted light into an almost optimal N-photon
coherence.Comment: 5 pages, including 2 figures and 1 table, final version for
publication as rapid communication in Phys. Rev.
Novel Magnetic and Thermodynamic Properties of Thiospinel Compound CuCrZrS
We have carried out dc magnetic susceptibility, magnetization and specific
heat measurements on thiospinel CuCrZrS. Below 58 K, dc
magnetic susceptibility and magnetization data show ferromagnetic behavior with
a small spontaneous magnetization 0.27 f. u..
In dc magnetic susceptibility, large and weak irreversibilities are observed
below 6 K and in the range
respectively.
We found that there is no anomaly as a peak or step in the specific heat at
.Comment: 11 pages, 4 figure
The Conflict between Bell-Zukowski Inequality and Bell-Mermin Inequality
We consider a two-particle/two-setting Bell experiment to visualize the
conflict between Bell-\.Zukowski inequality and Bell-Mermin inequality. The
experiment is reproducible by local realistic theories which are not
rotationally invariant. We found that the average value of the Bell-\.Zukowski
operator can be evaluated only by the two-particle/two-setting Bell experiment
in question. The Bell-\.Zukowski inequality reveals that the constructed local
realistic models for the experiment are not rotationally invariant. That is,
the two-particle Bell experiment in question reveals the conflict between
Bell-\.Zukowski inequality and Bell-Mermin inequality. Our analysis has found
the threshold visibility for the two-particle interference to reveal the
conflict noted above. It is found that the threshold visibility agrees with the
value to obtain a violation of the Bell-\.Zukowski inequality.Comment: To appear in Modern Physics Letters
An Avoidance Principle with an Application to the Asymptotic Behaviour of Graded Local Cohomology
We present an Avoidance Principle for certain graded rings. As an application
we fill a gap in the proof of a result by Brodmann, Rohrer and Sazeedeh about
the antipolynomiality of the Hilbert-Samuel multiplicity of the graded
components of the local cohomology modules of a finitely generated module over
a Noetherian homogeneous ring with two-dimensional local base ring.Comment: 6 pages; to appear in Journal of Pure and Applied Algebra; corrected
typo
Visualizing the geometry of state space in plane Couette flow
Motivated by recent experimental and numerical studies of coherent structures
in wall-bounded shear flows, we initiate a systematic exploration of the
hierarchy of unstable invariant solutions of the Navier-Stokes equations. We
construct a dynamical, 10^5-dimensional state-space representation of plane
Couette flow at Re = 400 in a small, periodic cell and offer a new method of
visualizing invariant manifolds embedded in such high dimensions. We compute a
new equilibrium solution of plane Couette flow and the leading eigenvalues and
eigenfunctions of known equilibria at this Reynolds number and cell size. What
emerges from global continuations of their unstable manifolds is a surprisingly
elegant dynamical-systems visualization of moderate-Reynolds turbulence. The
invariant manifolds tessellate the region of state space explored by
transiently turbulent dynamics with a rigid web of continuous and discrete
symmetry-induced heteroclinic connections.Comment: 32 pages, 13 figures submitted to Journal of Fluid Mechanic
Two Nucleon-States in a Chiral Quark-Diquark Model
We study the ground and first excited states of nucleons in a chiral
quark-diquark model. We include two quark-diquark channels of the
scalar-isoscalar and axial-vector-isovector types for the nucleon states. The
diquark correlation violating the spin-flavor SU(4) symmetry allows to
treat the two quark-diquark channels independently. Hence the two states appear
as the superpositions of the two quark-diquark channels; one is the nucleon and
the other is a state which does not appear in the SU(4) quark models.
With a reasonable choice of model parameters, the mass of the excited state
appears at around 1.5 GeV, which we identify with the Roper resonance N(1440).Comment: 11 pages, 5 figures. Errors are corrected. Conclusions are not
affecte
In-gap state and effect of light illumination in CuIrS probed by photoemission spectroscopy
We have studied disorder-induced in-gap states and effect of light
illumination in the insulating phase of spinel-type CuIrS using
ultra-violet photoemission spectroscopy (UPS). The Ir/Ir
charge-ordered gap appears below the metal-insulator transition temperature.
However, in the insulating phase, in-gap spectral features with are
observed in UPS just below the Fermi level (), corresponding to the
variable range hopping transport observed in resistivity. The spectral weight
at is not increased by light illumination, indicating that the
Ir-Ir dimer is very robust although the long-range octamer order
would be destructed by the photo-excitation. Present results suggest that the
Ir-Ir bipolaronic hopping and disorder effects are responsible
for the conductivity of CuIrS.Comment: 14 pages, 5 figure
A Comment on the Geometric Entropy and Conical Space
It has been recently pointed out that a definition of the geometric entropy
using the partition function in a conical space does not in general lead to a
positive definite quantity. For a scalar field model with a non-minimal
coupling we clarify the origin of the anomalous behavior from the viewpoint of
the canonical formulation.Comment: No Figures. To appear in Classical and Quantum Gravit
O Amarelão do melão: incidência e epidemiologia em áreas produtivas da região Nordeste.
bitstream/item/17602/1/Rita.pd
Expression and assembly of Norwalk virus-like particles in plants using a viral RNA silencing suppressor gene.
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