8,580 research outputs found
Excited Delirium Syndrome and Conducted Electrical Weapons
Excited delirium syndrome (ExDS) is defined as delirium coupled with extreme agitation (Vilke et al., 2012). ExDS is a bona fide medical condition that requires immediate medical attention, as 8% of patients will die from it. Some research only classifies ExDS as true ExDS if the subject dies; most research does not and this research does not wish to exclude the 92% of ExDS cases where the subject does not die. ExDS is well known because it oftentimes comes into play during and after a violent encounter with law enforcement. Because over 7,000 U.S. law enforcement agencies use TASER© brand conducted electrical weapons (CEW), many of these violent encounters involve some application of the TASER (TASER International, 2014). Due to the fact that some people struggle with law enforcement, have a TASER applied to them, and later experience ExDS symptoms, there is a rush to associate TASER application with ExDS. The purpose of this study is to evaluate if there is a relationship between the application of a TASER and a later onset of ExDS
Teleportation of qubit states through dissipative channels: Conditions for surpassing the no-cloning limit
We investigate quantum teleportation through dissipative channels and
calculate teleportation fidelity as a function of damping rates. It is found
that the average fidelity of teleportation and the range of states to be
teleported depend on the type and rate of the damping in the channel. Using the
fully entangled fraction, we derive two bounds on the damping rates of the
channels: one is to beat the classical limit and the second is to guarantee the
non-existence of any other copy with better fidelity. Effect of the initially
distributed maximally entangled state on the process is presented; and the
concurrence and the fully entangled fraction of the shared states are
discussed. We intend to show that prior information on the dissipative channel
and the range of qubit states to be teleported is helpful for the evaluation of
the success of teleportation, where success is defined as surpassing the
fidelity limit imposed by the fidelity of 1-to-2 optimal cloning machine for
the specific range of qubits.Comment: 12 pages, 7 figures, to appear in Phys. Rev.
The Balance between Life and Death of Cells: Roles of Metallothioneins
Metallothionein (MT) is a highly conserved, low-molecular-weight, cysteine-rich protein that occurs in 4 isoforms (MT-I to MT-IV), of which MT-I+II are the major and best characterized proteins
Smile from the Past: A general option pricing framework with multiple volatility and leverage components
In the current literature, the analytical tractability of discrete time option pricing models is guarantee only for rather specific type of models and pricing kernels. We propose a very general and fully analytical option pricing framework encompassing a wide class of discrete time models featuring multiple components structure in both volatility and leverage and a flexible pricing kernel with multiple risk premia. Although the proposed framework is general enough to include either GARCH-type volatility, Realized Volatility or a combination of the two, in this paper we focus on realized volatility option pricing models by extending the Heterogeneous Autoregressive Gamma (HARG) model of Corsi et al. (2012) to incorporate heterogeneous leverage structures with multiple components, while preserving closed-form solutions for option prices. Applying our analytically tractable asymmetric HARG model to a large sample of S&P 500 index options, we evidence its superior ability to price out-of-the-money options compared to existing benchmarks
Proposal for a cumulant-based Bell test for mesoscopic junctions
The creation and detection of entanglement in solid state electronics is of
fundamental importance for quantum information processing. We prove that
second-order quantum correlations can be always interpreted classically and
propose a general test of entanglement based on the violation of a classically
derived inequality for continuous variables by fourth-order quantum correlation
functions. Our scheme provides a way to prove the existence of entanglement in
a mesoscopic transport setup by measuring higher order cumulants without
requiring the additional assumption of a single charge detectionComment: 6 pages, 1 figure, detailed proof of weak positivity and Bell-type
inequalit
Kraus representation of damped harmonic oscillator and its application
By definition, the Kraus representation of a harmonic oscillator suffering
from the environment effect, modeled as the amplitude damping or the phase
damping, is directly given by a simple operator algebra solution. As examples
and applications, we first give a Kraus representation of a single qubit whose
computational basis states are defined as bosonic vacuum and single particle
number states. We further discuss the environment effect on qubits whose
computational basis states are defined as the bosonic odd and even coherent
states. The environment effects on entangled qubits defined by two different
kinds of computational basis are compared with the use of fidelity.Comment: 9 pages, 3 figure
Singular value decomposition and matrix reorderings in quantum information theory
We review Schmidt and Kraus decompositions in the form of singular value
decomposition using operations of reshaping, vectorization and reshuffling. We
use the introduced notation to analyse the correspondence between quantum
states and operations with the help of Jamiolkowski isomorphism. The presented
matrix reorderings allow us to obtain simple formulae for the composition of
quantum channels and partial operations used in quantum information theory. To
provide examples of the discussed operations we utilize a package for the
Mathematica computing system implementing basic functions used in the
calculations related to quantum information theory.Comment: 11 pages, no figures, see
http://zksi.iitis.pl/wiki/projects:mathematica-qi for related softwar
State-space distribution and dynamical flow for closed and open quantum systems
We present a general formalism for studying the effects of dynamical
heterogeneity in open quantum systems. We develop this formalism in the state
space of density operators, on which ensembles of quantum states can be
conveniently represented by probability distributions. We describe how this
representation reduces ambiguity in the definition of quantum ensembles by
providing the ability to explicitly separate classical and quantum sources of
probabilistic uncertainty. We then derive explicit equations of motion for
state space distributions of both open and closed quantum systems and
demonstrate that resulting dynamics take a fluid mechanical form analogous to a
classical probability fluid on Hamiltonian phase space, thus enabling a
straightforward quantum generalization of Liouville's theorem. We illustrate
the utility of our formalism by analyzing the dynamics of an open two-level
system using the state-space formalism that are shown to be consistent with the
derived analytical results
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