Secure quantum channels with correlated twin laser beams

This work is the development and analysis of the recently proposed quantum cryptographic protocol, based on the use of the two-mode coherently correlated states. The protocol is supplied with the cryptographic control procedures. The quantum noise influence on the channel error properties is examined. State detection features are proposed

Multiphoton communication in lossy channels with photon-number entangled states

We address binary and quaternary communication channels based on correlated multiphoton two-mode states of radiation in the presence of losses. The protocol are based on photon number correlations and realized upon choosing a shared set of thresholds to convert the outcome of a joint photon number measurement into a symbol from a discrete alphabet. In particular, we focus on channels build using feasible photon-number entangled states (PNES) as two-mode coherently-correlated (TMC) or twin-beam (TWB) states and compare their performances with that of channels built using feasible classically correlated (separable) states. We found that PNES provide larger channel capacity in the presence of loss, and that TWB-based channels may transmit a larger amount of information than TMC-based ones at fixed energy and overall loss. Optimized bit discrimination thresholds, as well as the corresponding maximized mutual information, are explicitly evaluated as a function of the beam intensity and the loss parameter. The propagation of TMC and TWB in lossy channels is analyzed and the joint photon number distribution is evaluated, showing that the beam statistics, either sub-Poissonian for TMC or super-Poissonian for TWB, is not altered by losses. Although entanglement is not strictly needed to establish the channels, which are based on photon-number correlations owned also by separable mixed states, purity of the support state is relevant to increase security. The joint requirement of correlation and purity individuates PNES as a suitable choice to build effective channels. The effects of losses on channel security are briefly discussed.Comment: 8 pages, 19 figure

Sensitivity of the spherical gravitational wave detector MiniGRAIL operating at 5 K

We present the performances and the strain sensitivity of the first spherical gravitational wave detector equipped with a capacitive transducer and read out by a low noise two-stage SQUID amplifier and operated at a temperature of 5 K. We characterized the detector performance in terms of thermal and electrical noise in the system output sygnal. We measured a peak strain sensitivity of $1.5\cdot 10^{-20} Hz^{-1/2}$ at 2942.9 Hz. A strain sensitivity of better than $5\cdot 10{-20}Hz{-1/2}$ has been obtained over a bandwidth of 30 Hz. We expect an improvement of more than one order of magnitude when the detector will operate at 50 mK. Our results represent the first step towards the development of an ultracryogenic omnidirectional detector sensitive to gravitational radiation in the 3kHz range.Comment: 8 pages, 5 figures, submitted to Physical Review

Revisiting the 'LSND anomaly' II: critique of the data analysis

This paper, together with a preceding paper, questions the so-called 'LSND anomaly': a 3.8 sigma excess of antielectronneutrino interactions over standard backgrounds, observed by the LSND Collaboration in a beam dump experiment with 800 MeV protons. That excess has been interpreted as evidence for the antimuonneutrino to antielectronneutrino oscillation in the \Deltam2 range from 0.2 eV2 to 2 eV2. Such a \Deltam2 range is incompatible with the widely accepted model of oscillations between three light neutrino species and would require the existence of at least one light 'sterile' neutrino. In a preceding paper, it was concluded that the estimates of standard backgrounds must be significantly increased. In this paper, the LSND Collaboration's estimate of the number of antielectronneutrino interactions followed by neutron capture, and of its error, is questioned. The overall conclusion is that the significance of the 'LSND anomaly' is not larger than 2.3 sigma.Comment: 30 pages, 16 figures, 6 table

Reply to 'Corrections to the HARP-CDP Analysis of the LSND Neutrino Oscillation Backgrounds'

The alleged mistakes in recent papers that reanalyze the backgrounds to the 'LSND anomaly' do not exist. We maintain our conclusion that the significance of the 'LSND anomaly' is not 3.8 sigma but not larger than 2.3 sigma.Comment: 3 page

Cross-sections of large-angle hadron production in proton- and pion-nucleus interactions VII: tin nuclei and beam momenta from \pm3 GeV/c to \pm15 GeV/c

We report on double-differential inclusive cross-sections of the production of secondary protons, charged pions, and deuterons, in the interactions with a 5% nuclear interaction length thick stationary tin target, of proton and pion beams with momentum from \pm3 GeV/c to \pm15 GeV/c. Results are given for secondary particles with production angles between 20 and 125 degrees. Cross-sections on tin nuclei are compared with cross-sections on beryllium, carbon, copper, tantalum and lead nuclei.Comment: 68 pages, 13 figure

Surgical treatment of neuroendocrine tumors of the pancreas: a single institutional experience

Institutul Naţional de Chirurgie şi Transplantologie “A.Shalimov”, Kiev, Ucraina, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: Tumorile neuroendocrine ale pancreasului (TNEP) ocupă de la 1 la 2% din patologia pancreatică oncologică, incidenţa diagnosticării pe parcursul vieţii este de 12-15 cazuri la 1 milion de populaţie. Scop: Familiarizarea cu cea mai mare experienţă de tratament chirurgical al tumorilor neuroendocrine pancreatice din Ucraina. Material și metode: În Institutul Naţional de Chirurgie şi Transplantologie din ianuarie 2004 pînă în decembrie 2014 au fost trataţi 173 pacienţi cu TNEP, la care s-au efectuat 181 intervenţii chirurgicale. Tumori pancreatice neuroendocrine nonfuncţionale au fost diagnosticate la 103 pacienţi (59,5%), hormonal active – la 70 (40,5%). În cazul TNEP non-funcţionale predominau procedeele chirurgicale rezecţionale (operaţia Whipple, pancreatectomia stîngă), pentru majoritatea tumorilor hormonal active s-au utilizat interventii organomenajante (enucleerea tumorii). Rezultate: Complicaţii postoperatorii s-au dezvoltat la 18,4% pacienţi cu TNEP, cea mai frecventă fiind fistula pancreatică externă (9,8%). Mortalitatea postoperatorie a constituit 1,2%. Supraviețuirea generală la 5 ani a fost de 82,3%, TNE G1 – 100%, TNE G2 – 84,3%, carcinom neuroendocrin, CNE G3 – 38,7%.Concluzii: Nivelul complicaţiilor postoperatorii şi a indicatorilor mortalităţii corespunde celorlalte tumori ale pancreasului. Nivelul supravieţuirii de 5 ani este destul de mare, ceea ce sugerează utilizarea intervenţiilor organomenajante laparoscopice pentru formele localizate de TNEP. Formele avansate de TNEP nu reprezintă o contraindicaţie pentru tratamentul chirurgical, dar astfel de cazuri trebuie evaluate în mod individual. Incidenţa relativ mică a TNEP, complexitatea şi importanţa diagnosticului preoperator pentru alegerea strategiei curative optimale, justifică efectuarea tratamentului acestor pacienţi în centre specializate.Introduction: Neuroendocrine tumors of the pancreas (PNET) range from 1 to 2% of pancreatic oncological pathology; the frequency during lifetime diagnostics is 12-15 cases per 1 million of population. Aim: Introduce the largest experience of surgical treatment of neuroendocrine tumors of the pancreas in Ukraine. Material and methods: In the National Institute of Surgery and Transplantology from January 2004 to December 2014 were treated 173 patients with neuroendocrine tumors of the pancreas, to whom were performed 181 surgeries. Non-functioning PNET were diagnosed in 103 patients (59.5%), hormone-active were in 70 (40.5%). In non-functioning PNET dominated resection surgeries (Whipple procedure, left-side pancreatectomy), at hormone-active were performed mostly organ-preserving surgeries (enucleation of tumor). Results: Postoperative complications occurred in 18.4% of patients with PNET, the most common complication was external pancreatic fistula (9.8%). Total postoperative mortality was 1.2%. The overall 5-year survival was 82.3%, NET G1 – 100%, NET G2 – 84.3%, neuroendocrine carcinoma, NEC G3 – 38.7%. Conclusions: The level of postoperative complications and mortality indicators complies with all tumors of the pancreas. The level of the overall 5-year survival is quite high, allowing for organ-preserving and laparoscopic surgeries for localized forms of PNET. Advance forms of PNET are not a contraindication to surgical treatment, but such cases must be evaluated individually. Relatively few of occurrences of PNET, the complexity and importance of preoperative diagnostic to choose the optimal treatments strategy, justifying perform the treatment of these patients in specialized centers

The HARP Resistive Plate Chambers: Characteristics and Physics Performance

The HARP Resistive Plate Chamber (RPC) system was designed for time-of-flight measurement in the large-angle acceptance region of the HARP spectrometer. It comprised 46 four-gap glass RPCs covering an area of _8m2. The design of the RPCs, their operation, intrinsic properties, and system performance are described. The intrinsic time resolution of the RPCs is better than 130 ps leading to a system time resolution of _175 ps

Third Addendum to the HARP WhiteBook

In this 'Third Addendum to the HARP WhiteBook', we present a detailed rebuttal to the 27 arguments against our TPC calibration work that were put forward by the 'HARP Collaboration' in their "Comments on 'The Harp Time Projection Chamber: characteristics and physics performance' by V. Ammosov et al.", and show 26 of them to be wrong, or inappropriate, or without substance