7,263 research outputs found
Efficient generation of universal two-dimensional cluster states with hybrid systems
We present a scheme to generate two-dimensional cluster state efficiently.
The number of the basic gate-entangler-for the operation is in the order of the
entanglement bonds of a cluster state, and could be reduced greatly if one uses
them repeatedly. The scheme is deterministic and uses few ancilla resources and
no quantum memory. It is suitable for large-scale quantum computation and
feasible with the current experimental technology.Comment: 6 pages, 5 figure
Microscopic description of octupole shape-phase transitions in light actinides and rare-earth nuclei
A systematic analysis of low-lying quadrupole and octupole collective states
is presented, based on the microscopic energy density functional framework. By
mapping the deformation constrained self-consistent axially symmetric
mean-field energy surfaces onto the equivalent Hamiltonian of the
interacting boson model (IBM), that is, onto the energy expectation value in
the boson condensate state, the Hamiltonian parameters are determined. The
study is based on the global relativistic energy density functional DD-PC1. The
resulting IBM Hamiltonian is used to calculate excitation spectra and
transition rates for the positive- and negative-parity collective states in
four isotopic chains characteristic for two regions of octupole deformation and
collectivity: Th, Ra, Sm and Ba. Consistent with the empirical trend, the
microscopic calculation based on the systematics of -
energy maps, the resulting low-lying negative-parity bands and transition rates
show evidence of a shape transition between stable octupole deformation and
octupole vibrations characteristic for -soft potentials.Comment: 18 pages, 18 figures, 1 tabl
Experimental quantum key distribution with active phase randomization
Phase randomization is an important assumption made in many security proofs
of practical quantum key distribution (QKD) systems. Here, we present the first
experimental demonstration of QKD with reliable active phase randomization. One
key contribution is a polarization-insensitive phase modulator, which we added
to a commercial phase-coding QKD system to randomize the global phase of each
bit. We also proposed a simple but useful method to verify experimentally that
the phase is indeed randomized. Our result shows very low QBER (<1%). We expect
this active phase randomization process to be a standard part in future QKD
set-ups due to its significance and feasibility.Comment: 3 pages, 3 figures, RevTE
Finite Temperature Phase Diagram in Rotating Bosonic Optical Lattice
Finite temperature phase boundary between superfluid phase and normal state
is analytically derived by studying the stability of normal state in rotating
bosonic optical lattice. We also prove that the oscillation behavior of
critical hopping matrix directly follows the upper boundary of Hofstadter
butterfly as the function of effective magnetic field.Comment: 10 pages, 2 figure
Can optical afterglows be used to discriminate between Type I and Type II GRBs?
The precise localization of short/hard (Type I) gamma-ray bursts (GRBs) in
recent years has answered many questions but raised even more. I present some
results of a systematic study of the optical afterglows of long/soft (Type II)
and short/hard (Type I) GRBs, focusing on the optical luminosity as another
puzzle piece in the classification of GRBs.Comment: 7 Pages, 2 figures, to be published in the "2008 Nanjing GRB
Conference" conference proceedings, figures have been downsample
The ensemble photometric variability of over quasars in the Dark Energy Camera Legacy Survey and the Sloan Digital Sky Survey
We present the ensemble variability analysis results of quasars using the
Dark Energy Camera Legacy Survey (DECaLS) and the Sloan Digital Sky Survey
(SDSS) quasar catalogs. Our dataset includes 119,305 quasars with redshifts up
to 4.89. Combining the two datasets provides a 15-year baseline and permits
analysis of the long timescale variability. Adopting a power-law form for the
variability structure function, , we use the
multi-dimensional parametric fitting to explore the relationships between the
quasar variability amplitude and a wide variety of quasar properties, including
redshift (positive), bolometric luminosity (negative), rest-frame wavelength
(negative), and black hole mass (uncertain). We also find that can be
also expressed as a function of redshift (negative), bolometric luminosity
(positive), rest-frame wavelength (positive), and black hole mass (positive).
Tests of the fitting significance with the bootstrap method show that, even
with such a large quasar sample, some correlations are marginally significant.
The typical value of for the entire dataset is ,
consistent with the results in previous studies on both the quasar ensemble
variability and the structure function. A significantly negative correlation
between the variability amplitude and the Eddington ratio is found, which may
be explained as an effect of accretion disk instability.Comment: 13 pages, 8 figures, 4 tables, accepted for publication in Ap
Quantum Manifestations of Graphene Edge Stress and Edge Instability: A First-Principles Study
We have performed first-principles calculations of graphene edge stresses,
which display two interesting quantum manifestations absent from the classical
interpretation: the armchair edge stress oscillates with a nanoribbon width,
and the zigzag edge stress is noticeably reduced by spin polarization. Such
quantum stress effects in turn manifest in mechanical edge twisting and warping
instability, showing features not captured by empirical potentials or continuum
theory. Edge adsorption of H and Stone-Wales reconstruction are shown to
provide alternative mechanisms in relieving the edge compression and hence to
stabilize the planar edge structure.Comment: 5figure
Pion charge form factor and constraints from space-time translations
The role of Poincar\'e covariant space-time translations is investigated in
the case of a relativistic quantum mechanics approach to the pion charge form
factor. It is shown that the related constraints are generally inconsistent
with the assumption of a single-particle current, which is most often referred
to. The only exception is the front-form approach with . How accounting
for the related constraints, as well as restoring the equivalence of different
RQM approaches in estimating form factors, is discussed. Some extensions of
this work and, in particular, the relationship with a dispersion-relation
approach, are presented. Conclusions relative to the underlying dynamics are
given.Comment: 6 pages, 2 figures, proceedings of the QNP2009 international
conference (Beijing, oct. 2009), to be published in Chinese Physics
Global Shifts in Agro-Industrial Capital and the Case of Soybean Crushing: Implications for Managers and Policy Makers
Tremendous shifts are occurring in the location of agro-industrial capital around the globe. To focus discussion on this topic a session was convened at the annual meeting of the International Food and Agribusiness Management Association in Montreux, Switzerland in June of 2004. The session brought together researchers and industry leaders to better understand these dramatic shifts and the implications they hold for the agri-food system. The following article emerges from that session. The first part of the article provides the context for the discussion by looking at global shifts in soybean processing investment. The second part entails reaction by three industry panelists.Soybeans, Processing, Investment, Global strategy, Agribusiness, Agricultural and Food Policy,
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