4,661 research outputs found
Authenticated teleportation with one-sided trust
We introduce a protocol for authenticated teleportation, which can be proven
secure even when the receiver does not trust their measurement devices, and is
experimentally accessible. We use the technique of self-testing from the
device-independent approach to quantum information, where we can characterise
quantum states and measurements from the exhibited classical correlations
alone. First, we derive self-testing bounds for the Bell state and Pauli
measurements, that are robust enough to be implemented in
the lab. Then, we use these to determine a lower bound on the fidelity of an
untested entangled state to be used for teleportation. Finally, we apply our
results to propose an experimentally feasible protocol for one-sided
device-independent authenticated teleportation. This can be interpreted as a
first practical authentication of a quantum channel, with additional one-sided
device-independence.Comment: published versio
GIANT CYSTIC HYGROMA COLLI IN AN ADULT- A RARE CASE REPORT
Cystic hygroma (lymphangioma) is often a benign congenital malformation of the lymphatic system that occurs as a result of sequestration or obstruction of lymphatic vessels. Theselesions are usually discovered in infant or children younger than two years of age.Occurrence in adults is uncommon, and fewer than 100 cases of adult lymphangioma have been reported in the literature (1,2) . The objectives of this case report are to present theclinical history and surgical findings, review of literature and the unique problems encountered in the surgical management of this particular patient
Management of Tuberculosis - The Need to Enforce Proper Treatment Guidelines among Private Practitioners in India
Tuberculosis continues to be a daunting challenge for our healthcare system. Even after fifteen years of the much publicised Revised National Tuberculosis Control Programme that envisages directly observed short course chemotherapy (DOTS), TB continues to spread and drug resistant strains, MDR and XDR, are also increasingly reported. More than 50% of TB patients seeking private health care, but the level of awareness regarding treatment of TB among private practitioners appears to be poor. All this call for an urgent revamp of TB control strategy in India
Short term optical variability in broad absorption line QSOs
We present the first results from a pilot programme to monitor the short term
optical variability in Broad Absorption Line system QSOs. Intra-night optical
variations of ~5% were detected on time scales of ~ one hour in QSOs 0846+156
and 0856+172. Further, the mean magnitude level decreased in the two objects by
~0.05 and ~0.15 magnitude respectively during the period of our observations.
The observed light curves are quite similar to those previously seem in the
flat spectrum radio-loud sources, especially the BL Lacertae objects, and can
provide important constraints for the origin of microvariability, and also a
possible evolutionary link between the radio-loud and the radio-quiet QSOs.Comment: 12 pages Latex file uses AASTEX, 2 Postscript figures. To appear in
ApJ Letter
Recurrent Novae at Quiescence: Systems with Giant Secondaries
Spectroscopic and photometric behaviour of the class of recurrent novae with
giant secondaries (T Coronae Borealis, RS Ophiuchi, V3890 Sagittarii and V745
Scorpii) at quiescence are presented in this study. The hot component in these
systems is variable, with the variability manifesting as variability in the
ultraviolet luminosity, the ultraviolet and optical emission line fluxes and in
the UBV/visual magnitudes. The variations are uncorrelated with the binary
orbital motion. The observed ultraviolet+optical spectral characteristics of
the hot component in these systems can be explained by a white dwarf+accretion
disc embedded in an envelope of wind from the M giant secondary. We suggest the
observed variations are a result of (a) fluctuations in the mass accretion
rate; (b) changes in the column density of the absorbing, optically thick, wind
envelope.Comment: 11 pages, 7 postscript figures. Uses laa.sty, eps.sty. To appear in
A&A (main journal
A hypothesize-and-verify framework for Text Recognition using Deep Recurrent Neural Networks
Deep LSTM is an ideal candidate for text recognition. However text
recognition involves some initial image processing steps like segmentation of
lines and words which can induce error to the recognition system. Without
segmentation, learning very long range context is difficult and becomes
computationally intractable. Therefore, alternative soft decisions are needed
at the pre-processing level. This paper proposes a hybrid text recognizer using
a deep recurrent neural network with multiple layers of abstraction and long
range context along with a language model to verify the performance of the deep
neural network. In this paper we construct a multi-hypotheses tree architecture
with candidate segments of line sequences from different segmentation
algorithms at its different branches. The deep neural network is trained on
perfectly segmented data and tests each of the candidate segments, generating
unicode sequences. In the verification step, these unicode sequences are
validated using a sub-string match with the language model and best first
search is used to find the best possible combination of alternative hypothesis
from the tree structure. Thus the verification framework using language models
eliminates wrong segmentation outputs and filters recognition errors
The Thirty Meter Telescope International Observatory facilitating transformative astrophysical science
The next major advancement in astronomy and cosmology will be driven by deep
observations using very sensitive telescopes with high spatial and spectral
resolution capabilities. An international consortium of astronomers, including
Indian astronomers are building the Thirty Meter Telescope to achieve
breakthroughs in different areas of astronomy starting from studies of the
solar system to that of the early universe. This article provides a brief
overview of the telescope, science objectives and details of the first light
instruments.Comment: 10 page
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