2,098 research outputs found
Generating entanglement with linear optics
Entanglement is the basic building block of linear optical quantum
computation, and as such understanding how to generate it in detail is of great
importance for optical architectures. We prove that Bell states cannot be
generated using only 3 photons in the dual-rail encoding, and give strong
numerical evidence for the optimality of the existing 4 photon schemes. In a
setup with a single photon in each input mode, we find a fundamental limit on
the possible entanglement between a single mode Alice and arbitrary Bob. We
investigate and compare other setups aimed at characterizing entanglement in
settings more general than dual-rail encoding. The results draw attention to
the trade-off between the entanglement a state has and the probability of
postselecting that state, which can give surprising constant bounds on
entanglement even with increasing numbers of photons.Comment: 13 pages, 10 figures, 1 table, comments welcom
CAREER PLANNING IN THE LAW. By Kenneth Robert Redden. Indianapolis: The Bobbs-Merrill Company, Inc., 1951.
Magnetoencephalography as a tool in psychiatric research: current status and perspective
The application of neuroimaging to provide mechanistic insights into circuit dysfunctions in major psychiatric conditions and the development of biomarkers are core challenges in current psychiatric research. In this review, we propose that recent technological and analytic advances in Magnetoencephalography (MEG), a technique which allows the measurement of neuronal events directly and non-invasively with millisecond resolution, provides novel opportunities to address these fundamental questions. Because of its potential in delineating normal and abnormal brain dynamics, we propose that MEG provides a crucial tool to advance our understanding of pathophysiological mechanisms of major neuropsychiatric conditions, such as Schizophrenia, Autism Spectrum Disorders, and the dementias. In our paper, we summarize the mechanisms underlying the generation of MEG signals and the tools available to reconstruct generators and underlying networks using advanced source-reconstruction techniques. We then survey recent studies that have utilized MEG to examine aberrant rhythmic activity in neuropsychiatric disorders. This is followed by links with preclinical research, which have highlighted possible neurobiological mechanisms, such as disturbances in excitation/inhibition parameters, which could account for measured changes in neural oscillations. In the final section of the paper, challenges as well as novel methodological developments are discussed which could pave the way for a widespread application of MEG in translational research with the aim of developing biomarkers for early detection and diagnosis
CAREER PLANNING IN THE LAW. By Kenneth Robert Redden. Indianapolis: The Bobbs-Merrill Company, Inc., 1951.
PBP5 and PBP6, the major D,D-carboxypeptidases from Escherichia coli, as a model for penicillin-interacting proteins
PBP5 and PBP6, the major D,D-carboxypeptidases from Escherichia coli, as a model for penicillin-interacting proteins
PBP5 and PBP6, the major D,D-carboxypeptidases from Escherichia coli, as a model for penicillin-interacting proteins
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