共查询到20条相似文献,搜索用时 31 毫秒
1.
Su-Juan Qin 《International Journal of Theoretical Physics》2012,51(9):2714-2718
A controlled quantum secure direct communication protocol (Zhang et al. in Int. J. Theor. Phys. 48:2971–2976, 2009) by using four particle cluster states was proposed recently. Yang et al. presented an attack with fake entangled particles (FEP attack) and gave an improvement (Yang et al. in Int. J. Theor. Phys. 50:395–400, 2010). In this paper, we reexamine the protocol’s security and discover that, Bob can also take a different attack, disentanglement attack, to obtain Alice’s secret message without controller’s permission. Moreover, our attack strategy also works for Yang’s improvement. 相似文献
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Anatoliy K. Prykarpatsky Nikolai N. Bogolubov 《International Journal of Theoretical Physics》2012,51(1):237-245
R. Feynman’s “heretical” approach (Dyson in Am. J. Phys. 58:209–211, 1990; Dyson in Phys. Today 42(2):32–38, 1989) to deriving the Lorentz force based Maxwell electromagnetic equations is revisited, the its complete legacy is argued both
by means of the geometric considerations and its deep relation with the vacuum field theory approach devised (Prykarpatsky
et al. in Int. J. Theor. Phys. 49:798–820, 2010; Prykarpatsky et al. in Preprint ICTP, 2008, ). Being completely classical, we reanalyze the Feynman’s derivation from the classical Lagrangian and Hamiltonian points
of view and construct its nontrivial relativistic generalization compatible with the vacuum field theory approach. 相似文献
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K. Daley 《International Journal of Theoretical Physics》2009,48(8):2379-2383
A re-visitation of QFT is first cited, deriving the Feynman integral from the theory of active stochastic processes (Glueck
and Hueffler, Phys. Lett. B. 659(1–2):447–451, 2008; Hueffel and Kelnhofer, Phys. Lett. B 588(1–2):145–150, 2004). We factor the lie group “generator” of the inverse wavefunction over an entropy-maximizing basis. Performing term-by-term
Ito-integration leads us to an analytical, evaluable trajectory for a charged particle in an arbitrary field given a Maximum-Entropy
distribution.
We generalize this formula to many-body electrodynamics. In theory, it is capable of predicting plasma’s thermodynamic properties
from ionic spectral data and thermodynamic and optical distributions. Blessed with the absence of certain limitations (e.g.,
renormalization) strongly present in competing formalisms and the incorporation of research related to many different phenomena,
we outline a candidate quantum gravity theory based on these developments. 相似文献
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A. M. Mukhamedov 《Russian Physics Journal》2009,52(3):314-320
A full version of author’s concept [1] of the developed spatially inhomogeneous chaos and turbulence is presented. A model of the structure of turbulent motion
phase space is suggested. Cases when the developed turbulence follows the Euler hydromechanical paradigm or falls outside
of its scope are discussed.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 84–90, March, 2009. 相似文献
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Field equations of Wesson’s (Wesson in Mon. Not. R. Astron. Soc. 197:157, 1981) scale invariant theory are obtained, with the aid of a plane symmetric metric in the presence of perfect fluid distribution.
Model corresponding to stiff fluid is constructed and discussed. It is found that the model admits a big bang like singularity
at initial epoch. Moreover, the shape of the universe remains unchanged during evolution. 相似文献
9.
Toung-Shang Wei Chia-Wei Tsai Tzonelih Hwang 《International Journal of Theoretical Physics》2011,50(9):2703-2707
Shi et al. (Phys. Lett. A 281:83–87, 2001) proposed a scheme which allows simultaneous realization of quantum key distribution and quantum authentication. However,
this study points out a weakness in Shi et al.’s scheme, in which a malicious user can impersonate a legitimate participant
without being detected. Furthermore, an improved scheme is proposed to avoid this weakness. 相似文献
10.
Because quantum devices are expensive, quantum secret sharing protocols with collective eavesdropping-check are more efficient
and easier to realize than protocols employing step-by-step detection. In a recent paper (Lin et al. in Opt. Commun. 282:4455,
2009), put forward a quantum secret sharing protocol with collective eavesdropping-check. However, Gao found the four-party protocol
of Lin et al. is insecure in the sense that two dishonest agents may collaborate to eavesdrop half of Alice’s secret without
introducing any error (Gao in Opt. Commun. 283:2997, 2010). We point that there is a grievous mistake in Gao’s attack strategy and the two agents can only get one eighth of, not half
of, Alice’s secret. In this paper, we study the properties of entanglement swapping and improve Gao’s eavesdropping strategy
so that two dishonest agents can get all of Alice’s secret. Also we improve Lin et al.’s quantum secret sharing protocol against
such attack. 相似文献
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Bell’s inequality is investigated for the three qubit GHZ state in relativistic regime. Two different relativistic spin operator
are considered. One of them is defined by Lee and Ee (New J. Phys. 6:67, 2004). and the other which is the Pauli-Lubanski pseudovector used by Kim and Son (Phys. Rev. A 71:014102, 2005). It is shown that for both spin operator Bell’s inequality is still maximally violated in a Lorentz-boosted frame. 相似文献
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Peter Nyman 《International Journal of Theoretical Physics》2010,49(1):1-9
In this paper we continue to study so-called “inverse Born’s rule problem”: to construct a representation of probabilistic
data of any origin by a complex probability amplitude which matches Born’s rule. The corresponding algorithm—quantum-like
representation algorithm (QLRA)—was recently proposed by A. Khrennikov (Found. Phys. 35(10):1655–1693, 2005; Physica E 29:226–236, 2005; Dokl. Akad. Nauk 404(1):33–36, 2005; J. Math. Phys. 46(6):062111–062124, 2005; Europhys. Lett. 69(5):678–684, 2005). Formally QLRA depends on the order of conditioning. For two observables (of any origin, e.g., physical or biological) a and b, b|a- and a|b conditional probabilities produce two representations, say in Hilbert spaces H
b|a
and H
a|b
. In this paper we prove that under “natural assumptions” (which hold, e.g., for quantum observables represented by operators
with nondegenerate spectra) these two representations are unitary equivalent. This result proves the consistency of QLRA. 相似文献
14.
In this paper, we have investigated spatially homogeneous isotropic Friedman-Robertson-Walker cosmological model with bulk viscosity and zero-mass scalar field in the frame work of Barber’s second self-creation theory (Gen. Relativ. Gravit. 14:117, 1982). The cosmological models are obtained with the help of the special law of variation for Hubble’s parameter proposed by Bermann (Nuovo Cimento B 74:182, 1983) and power law relation. Some physical properties of the models are also discussed. 相似文献
15.
The unsteady shock wave diffraction over a 90° sharp corner in gases of arbitrary particle statistics is simulated using an
accurate and direct algorithm for solving the semiclassical Boltzmann equation with relaxation time approximation in phase
space. The numerical method is based on the usage of discrete ordinate method for discretizing the velocity space of the distribution
function; whereas a second order accurate TVD scheme (Harten in J. Comput. Phys. 49(3):357–393, 1983) with Van Leer’s limiter (J. Comput. Phys. 32(1):101–136, 1979) is used for evolving the solution in physical space and time. The specular reflection surface boundary condition is assumed.
The complete diffraction patterns are recorded using various flow property contours. Different range of relaxation times approximately
corresponding to continuum, slip and transitional regimes are considered and the equilibrium Euler limit solution is also
computed for comparison. The effects of gas particles that obey the Maxwell-Boltzmann, Bose-Einstein and Fermi-Dirac statistics
are examined and depicted. 相似文献
16.
The present work establishes the mean-field limit of a N-particle system towards a regularized variant of the relativistic Vlasov-Maxwell system, following the work of Braun-Hepp
[Commun Math Phys 56:101–113, 1977] and Dobrushin [Func Anal Appl 13:115–123, 1979] for the Vlasov-Poisson system. The main ingredients in the analysis of this system are (a) a kinetic formulation of the
Maxwell equations in terms of a distribution of electromagnetic potential in the momentum variable, (b) a regularization procedure
for which an analogue of the total energy—i.e. the kinetic energy of the particles plus the energy of the electromagnetic
field—is conserved and (c) an analogue of Dobrushin’s stability estimate for the Monge-Kantorovich-Rubinstein distance between
two solutions of the regularized Vlasov-Poisson dynamics adapted to retarded potentials. 相似文献
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Applying the well-known Feynman-Kac formula of inhomogeneous case, an interesting and rigorous mathematical proof of generalized
Jarzynski’s equality of inhomogeneous multidimensional diffusion processes is presented, followed by an extension of the second
law of thermodynamics. Then, we explain its physical meaning and applications, extending Hummer and Szabo’s work (Proc. Natl.
Acad. Sci. USA 98(7):3658–3661, [2001]) and Hatano-Sasa equality of steady state thermodynamics (Phys. Rev. Lett. 86:3463–3466, [2001]) to the general multidimensional case. 相似文献
18.
Spatially homogeneous and anisotropic LRS Bianchi type-I metric is considered in the framework of Nordtvedt-Barker’s general
scalar-tensor theory of gravitation when the source for the energy momentum tensor is a perfect fluid. With the help of a
special law of variation for Hubble’s parameter proposed by Berman (Nuovo Cim. B. 74:182, 1983) a cosmological model with negative constant deceleration parameter is obtained. Some physical and kinematical properties
of the model are also discussed. 相似文献
19.
The evolution of a superthermal relict plasma component is studied using a nonequilibrium model of the Universe [1] and a kinetic equation of the Fokker–Planck type [2]. Given is the evidence of two maxima in the distribution of superthermal particles. The first maximum can further evolve
into an equilibrium distribution, whereas the second one can result in a high-energy tail of superthermal relict particles.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 87–91, February, 2009. 相似文献
20.
In this paper, we generalize the Kirchhoff-Sobolev parametrix of Klainerman and Rodnianski (Hyperbolic Equ. 4(3):401–433,
2007) to systems of tensor wave equations with additional first-order terms. We also present a different derivation, which better
highlights that such representation formulas are supported entirely on past null cones. This generalization of (Hyperbolic
Equ. 4(3):401–433, 2007) is a key component for extending Klainerman and Rodnianski’s breakdown criterion result for Einstein-vacuum spacetimes in
(J. Amer. Math. Soc. 23(2):345–382, 2009) to Einstein-Maxwell and Einstein-Yang-Mills spacetimes. 相似文献