4,020 research outputs found
Effects of depolarizing quantum channels on BB84 and SARG04 quantum cryptography protocols
We report experimental studies on the effect of the depolarizing quantum
channel on weak-pulse BB84 and SARG04 quantum cryptography. The experimental
results show that, in real world conditions in which channel depolarization
cannot be ignored, BB84 should perform better than SARG04.Comment: 4 pages, 4 figure
Technological novelty profile and invention's future impact
We consider inventions as novel combinations of existing technological
capabilities. Patent data allow us to explicitly identify such combinatorial
processes in invention activities. Unconsidered in the previous research, not
every new combination is novel to the same extent. Some combinations are
naturally anticipated based on patent activities in the past or mere random
choices, and some appear to deviate exceptionally from existing invention
pathways. We calculate a relative likelihood that each pair of classification
codes is put together at random, and a deviation from the empirical observation
so as to assess the overall novelty (or conventionality) that the patent brings
forth at each year. An invention is considered as unconventional if a pair of
codes therein is unlikely to be used together given the statistics in the past.
Temporal evolution of the distribution indicates that the patenting activities
become more conventional with occasional cross-over combinations. Our analyses
show that patents introducing novelty on top of the conventional units would
receive higher citations, and hence have higher impact.Comment: 20 pages, 7 figure
Concept of multiple-cell cavity for axion dark matter search
In cavity-based axion dark matter search experiments exploring high mass
regions, multiple-cavity design is considered to increase the detection volume
within a given magnet bore. We introduce a new idea, referred to as
multiple-cell cavity, which provides various benefits including a larger
detection volume, simpler experimental setup, and easier phase-matching
mechanism. We present the characteristics of this concept and demonstrate the
experimental feasibility with an example of a double-cell cavity.Comment: 8 pages, 11 figure
Study of the Top-quark Pair Production in Association with a Bottom-quark Pair from Fast Simulations at the LHC
A large number of top quarks will be produced at the Large Hadron Collider
(LHC) for Run II period. This will allow us to measure the rare processes from
the top sector in great details. We present the study of the top-quark pair
production in association with a bottom-quark pair (ttbb) from fast simulations
for the Compact Muon Solenoid (CMS) experiment. The differential distributions
of ttbb are compared with the top-quark pair production with two additional
jets (ttjj) and with the production in association with the Higgs (ttH), where
the Higgs decays to a bottom-quark pair. The significances of ttbb process in
the dileptonic and semileptonic decay mode are calculated with the data
corresponding to an integrated luminosity of 10 fb-1, which is foreseen to be
collected in the early Run II period. This study will be an important input in
searching for new physics beyond the standard model as well as in searching for
ttH process where the Yukawa coupling with the top quark can be directly
measured.Comment: 12 pages, 12 figure
Revisiting the detection rate for axion haloscopes
The cavity haloscope has been employed to detect microwave photons resonantly
converted from invisible cosmic axions under a strong magnetic field. In this
scheme, the axion-photon conversion power has been formulated to be valid for
certain conditions, either or . This remedy, however, fails when these two quantities are
comparable to each other. Furthermore, the noise power flow has been treated
independently of the impedance mismatch of the system, which could give rise to
misleading estimates of the experimental sensitivity. We revisit the analytical
approaches to derive a general description of the signal and noise power. We
also optimize the coupling strength of a receiver to yield the maximal
sensitivity for axion search experiments.Comment: 15 pages, 7 figure
A Study on Radiant Heat Application to the Curing Process for Improvement of Free-form Concrete Panel Productivity
As free-form panel production takes a long time, it extends the construction period and increases construction expenses. This study suggests a method to apply radiant heat to concrete for the purpose of shortening the curing and removal process in free-form panel production. The optimal temperature and time for removal are determined based on the results of constant temperature/humidity curing experiments and quartz tube heater curing experiments. Through an experiment in various time settings, the general time of FCP (Free-form Concrete Panel) production is measured to examine whether the productivity is enhanced. It is expected that findings of this study contribute to shortening the construction period and reducing construction expenses as well as future studies on the FCP manufacturing equipment
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High-Performance PVC Gel for Adaptive Micro-Lenses with Variable Focal Length.
This paper presents a bio-inspired adaptive micro-lens with electrically tunable focus made of non-ionic high-molecular-weight polyvinyl chloride (PVC) gel. The optical device mimics the design of the crystalline lens and ciliary muscle of the human eye. It consists of a plano-convex PVC gel micro-lens on Indium Tin Oxide (ITO) glass, confined with an annular electrode operating as an artificial ciliary muscle. Upon electrical activation, the electroactive adhesive force of the PVC gel is exerted on the annular anode electrode, which reduces the sagittal height of the plano-convex PVC gel lens, resulting in focal length variation of the micro-lens. The focal length increases from 3.8 mm to 22.3 mm as the applied field is varied from 200 V/mm to 800 V/mm, comparable to that of the human lens. The device combines excellent optical characteristics with structural simplicity, fast response speed, silent operation, and low power consumption. The results show the PVC gel micro-lens is expected to open up new perspectives on practical tunable optics
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