160 research outputs found
Multiphoton communication in lossy channels with photon-number entangled states
No full textWe 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 built 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
Quantum communication with photon-number entangled states and realistic photodetection
No full textWe address the effects of realistic photodetection, with nonunit quantum efficiency and background noise (dark counts), on the performances of quantum communication schemes based on photon-number entangled states (PNES). We consider channels based on Gaussian twin-beam states (TWB) and non-Gaussian two-mode coherent states (TMC) and evaluate the channel capacity by optimizing the bit discrimination threshold. We found that TWB-based channels are more robust against noise than TMC-based ones and that this result is almost independent on the statistics of dark counts
Bit threshold optimization for multiphoton communication in lossy channels
No full textWe address M-ary communication channels based on entangled two-mode states of radiation in the presence of losses. In particular we focus on channels build by two-mode coherently-correlated (TMC) or twin-beam (TWB) states. Optimized bit discrimination thresholds, as well as the corresponding maximized mutual information, are explicitly evaluated as a function of beam intensities and loss parameters for binary and quaternary alphabets. The evolution of the two entangled support states 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 channel losses. The effects of losses on the channel security is discussed
Robustness of entanglement-based discrete- and continuous-variable quantum key distribution against channel noise - data set
No full textThe dataset includes the code, written in Wolfram Mathematica, needed to reproduce the results of numerical simulations presented in the following article:M. Lasota, O. Kovalenko, V. C. Usenko, "Robustness of entanglement-based discrete- and continuous-variable quantum key distribution against channel noise", New J. Phys. 25, 123003 (2023).The file is divided on two sections. The first one entitled "Key generation rate formulas" includes all the equations necessary to calculate key generation rate for various protocols and sets of assumptions analyzed in the aforementioned paper.The second section entitled "Data for figures" contains all the steps necessary for performing numerical simulations and presenting their results exactly as they were shown in the article.</p
Cross-sections of large-angle hadron production in proton-and pion-nucleus interactions VIII: Aluminium nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c
No full textWe report on double-differential inclusive crosssections of the production of secondary protons, charged pions, and deuterons, in the interactions with a 5% λint thick stationary aluminium target, of proton and pion beams with momentum from ±3 GeV/c to ±15 GeV/c. Results are given for secondary particles with production angles 20° < θ < 125°. Cross-sections on aluminium nuclei are compared with cross-sections on beryllium, carbon, copper, tin, tantalum and lead nuclei. © The Author(s) 2012
Comparison of Gean4 hadron generation with data from the interactions with beryllium nuclei of +8.9-GeV/c protons and pions, and of -8.0-GeV/c pions
No full textComparison of Gean4 hadron generation with data from the interactions with beryllium nuclei of +8.9-GeV/c protons and pions, and of -8.0-GeV/c pion
Cross-sections of large-angle hadron production in proton- and pion-nucleus interactions VI: Carbon nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c
No full textWe report on double-differential inclusive cross-sections of the production of secondary protons, charged pions, and deuterons, in the interactions with a 5% lambda (int) thick stationary carbon target, of proton and pion beams with momentum from +/- 3 GeV/c to +/- 15 GeV/c. Results are given for secondary particles with production angles 20A degree
Cross-sections of large-angle hadron production in proton- and pion-nucleus interactions I: Beryllium nuclei and beam momenta of +8.9 GeV/c and -8.0 GeV/c
No full textWe report on double-differential inclusive cross-sections of the production of secondary protons, deuterons, and charged pions and kaons, in the interactions with a 5% λ abs thick stationary beryllium target, of a +8.9 GeV/c proton and pion beam, and a -8.0 GeV/c pion beam. Results are given for secondary particles with production angles 20 °<θ<125°. © 2009 Springer-Verlag
Cross-sections of hadron production by 3-GeV/c - 15-GeV/c beams of protons and charged pions
No full textCross-sections of hadron production by 3-GeV/c - 15-GeV/c beams of protons and charged pion
Physics of Atomic Nuclei V. 66, I. 01
No full textPhysics of Atomic Nuclei -- January 2003
Volume 66, Issue 1, pp. 1-202
100th ANNIVERSARY OF I.V. KURCHATOV'S BIRTH
Igor' Vasil'evich Kurchatov: The Scientist and Doer (January 12, 1903–February 7, 1960)
Yu. V. Gaponov
pp. 1-5 Full Text: PDF (125 kB)
Search for Neutron Resonances in the 178m2Hf Isomer and Their Investigation
G. V. Muradian, O. Ya. Shatrov, M. A. Voskanian, L. P. Yastrebova, V. L. Volkov, Ch. Briançon, M. Hussonnois, Yu. Ts. Oganessian, S. A. Karamian, and O. Constantinescu
pp. 6-16 Full Text: PDF (404 kB)
Investigation of 138Ba in the (n, n[prime]gamma) Reaction
L. I. Govor, A. M. Demidov, and I. V. Mikhailov
pp. 17-29 Full Text: PDF (235 kB)
Condensates in Quantum Chromodynamics
B. L. Ioffe
pp. 30-43 Full Text: PDF (311 kB)
NUCLEI
Experiment
Measurements of the Partial Cross Section for the Reaction 48Ti(n, gamma1)49Ti and Estimation of the Radiative Strength Functions for E1 and M1 Transitions
A. V. Voinov, D. G. Serov, Yu. P. Popov, N. A. Gundorin, A. P. Kobzev, and S. S. Parzhitski
pp. 44-46 Full Text: PDF (290 kB)
Refractive Effects in the Reaction 13C(3He, t)13N at an Energy of 60 MeV
N. Burtebaev, A. Duisebaev, and S. B. Sakuta
pp. 47-55 Full Text: PDF (245 kB)
Neutron Scattering in Argon and ne Interaction
T. L. Enik, V. A. Ermakov, R. V. Kharjuzov, L. V. Mitsyna, V. G. Nikolenko, S. S. Parzhitski, A. B. Popov, G. S. Samosvat, and V. A. Vtjurin
pp. 56-60 Full Text: PDF (182 kB)
Theory
Exact Solutions to the Three-Body Problem for S-Wave Interactions of the Centrifugal Type
V. V. Pupyshev
pp. 61-74 Full Text: PDF (293 kB)
Analytic Estimates of the Product Yields for Nuclear Reaction in the Ultralow Energy Range
V. M. Bystritsky and F. M. Pen'kov
pp. 75-80 Full Text: PDF (159 kB)
nd Scattering at Low Energies in the Two-Body Potential Model
Yu. V. Orlov and Yu. P. Orevkov
pp. 81-86 Full Text: PDF (165 kB)
dt, d3He, and palpha Scattering in the Vicinity of the 5He* and 5Li* Resonances
A. V. Kulik and V. D. Mur
pp. 87-98 Full Text: PDF (265 kB)
Results of Numerically Solving an Integral Equation for a Two-Fermion System
N. B. Skachkov and T. M. Solov'eva
pp. 99-104 Full Text: PDF (158 kB)
ELEMENTARY PARTICLES AND FIELDS
Experiment
Study of the K–-->µ–nupi0 Decay
I. V. Ajinenko, S. A. Akimenko, G. I. Britvich, I. G. Britvich, K. V. Datsko, A. P. Filin, A. V. Inyakin, A. S. Konstantinov, V. F. Konstantinov, I. Ya. Korolkov, V. M. Leontiev, V. P. Novikov, V. F. Obraztsov, V. A. Polyakov, V. I. Romanovsky, V. I. Shelikhov, N. E. Smirnov, M. M. Soldatov, O. G. Tchikilev, E. A. Usenko, M. V. Vasiliev, E. V. Vlasov, V. I. Yakimchuk, O. P. Yushchenko, V. N. Bolotov, S. V. Laptev, V. A. Lebedev, A. R. Pastsjak, A. Yu. Polyarush, and R. Kh. Sirodeev
pp. 105-109 Full Text: PDF (324 kB)
Measurement of the Total and Differential Cross Sections for the Reaction pi–p --> etan with the Crystal Ball Detector
N. G. Kozlenko, V. V. Abaev, V. S. Bekrenev, S. P. Kruglov, A. A. Koulbardis, I. V. Lopatin, A. B. Starostin, B. Draper, S. Hayden, J. Huddleston, D. Isenhower, C. Robinson, M. Sadler, C. Allgower, R. Cadman, H. Spinka, J. Comfort, K. Craig, A. Ramirez, T. Kycia[dagger], M. Clajus, A. Marusic, S. McDonald, B. M. K. Nefkens, N. Phaisangittisakul, S. Prakhov, J. W. Price, W. B. Tippens, J. Peterson, W. J. Briscoe, A. Shafi, I. I. Strakovsky, H. Staudenmaier, D. M. Manley, J. Olmsted, D. Peaslee, N. Knecht, G. Lolos, Z. Papandreou, I. Supek, I. Slaus, A. Gibson, D. Grosnic, D. Koetke, R. Manweiler, and S. Stanislaus
pp. 110-113 Full Text: PDF (164 kB)
The A Dependence of Fast-Particle Spectra in pi+, K+, and p Interactions with Al and Au Targets at 250 GeV/c
N. M. Agababyan et al. (EHS/NA22 Collaboration)
pp. 114-122 Full Text: PDF (259 kB)
Study of Single Muons with the Large Volume Detector at the Gran Sasso Laboratory
M. Aglietta et al. (LVD Collaboration)
pp. 123-129 Full Text: PDF (408 kB)
Measurement of Energy of Medium-Mass and Heavy Cosmic-Ray Nuclei by a Specific Energy Deposition at the Maximum of Hadron Showers in Dense Matter
I. D. Rapoport, A. N. Turundaevsky, and V. Ya. Shestoperov
pp. 130-134 Full Text: PDF (137 kB)
Theory
Spacetime Symplectic Extension
Yu. F. Pirogov
pp. 135-142 Full Text: PDF (205 kB)
Relativistic Treatment of the Hard-Bremsstrahlung Process pp-->ppgamma and Possibility of Discriminating between Different Types of Nucleon–Nucleon Interaction
N. A. Khokhlov, V. G. Neudatchin, and V. A. Knyr
pp. 143-151 Full Text: PDF (229 kB)
Near-Threshold Production of a0(980) Mesons in piN and NN Collisions and a0–f0 Mixing
L. A. Kondratyuk, E. L. Bratkovskaya, V. Yu. Grishina, M. Büscher, W. Cassing, and H. Ströher
pp. 152-171 Full Text: PDF (478 kB)
Three-Body Dispersion-Relation N/D Equations for the Coupled Decay Channels p-bar p(JPC = 0–+) --> pi0pi0pi0, etapi0pi0, etaetapi0, K-bar Kpi0
A. V. Anisovich
pp. 172-181 Full Text: PDF (236 kB)
Hadronization as Valon Confinement in the Course of Nuclear-Matter Cooling
I. I. Royzen and O. D. Chernavskaya
pp. 182-190 Full Text: PDF (231 kB)
Using a Chiral Anomaly to Determine the Number of Colors
R. N. Rogalyov
pp. 191-194 Full Text: PDF (161 kB)
Photoproduction as the Limiting Case of Inelastic Scattering
A. A. Petrukhin and D. A. Timashkov
pp. 195-202 Full Text: PDF (216 kB)Archived web conten
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