Results 11 to 20 of about 60,982 (263)

Estimating Quantum Mutual Information of Continuous-Variable Quantum States by Measuring Purity and Covariance Matrix

open access: yesEntropy, 2022
We derive accessible upper and lower bounds for continuous-variable (CV) quantum states on quantum mutual information. The derivations are based on the observation that some functions of purities bound the difference between quantum mutual information of
Jiyong Park
doaj   +1 more source

Classical Lower Bounds from Quantum Upper Bounds [PDF]

open access: yes2018 IEEE 59th Annual Symposium on Foundations of Computer Science (FOCS), 2018
46 pages; to appear at FOCS ...
Shalev Ben-David   +3 more
openaire   +2 more sources

Global and blow-up solutions for a nonlinear reaction diffusion equation with Robin boundary conditions

open access: yesBoundary Value Problems, 2020
In the paper, we investigate global and blow-up solutions for a class of nonlinear reaction diffusion equations with Robin boundary conditions. By using auxiliary functions and a first-order differential inequality technique, we establish conditions on ...
Huimin Tian, Lingling Zhang
doaj   +1 more source

Comparison of an improved self-consistent lower bound theory with Lehmann’s method for low-lying eigenvalues

open access: yesScientific Reports, 2021
Ritz eigenvalues only provide upper bounds for the energy levels, while obtaining lower bounds requires at least the calculation of the variances associated with these eigenvalues. The well-known Weinstein and Temple lower bounds based on the eigenvalues
Miklos Ronto   +2 more
doaj   +1 more source

Lower and Upper Bounds of Fractional Metric Dimension of Connected Networks

open access: yesFractal and Fractional, 2021
The distance centric parameter in the theory of networks called by metric dimension plays a vital role in encountering the distance-related problems for the monitoring of the large-scale networks in the various fields of chemistry and computer science ...
Muhammad Javaid   +5 more
doaj   +1 more source

Tail Bounds for the Wiener Index of Random Trees [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2007
Upper and lower bounds for the tail probabilities of the Wiener index of random binary search trees are given. For upper bounds the moment generating function of the vector of Wiener index and internal path length is estimated.
Tämur Ali Khan, Ralph Neininger
doaj   +1 more source

Improving bounds on packing densities of 4-point permutations [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2018
We consolidate what is currently known about packing densities of 4-point permutations and in the process improve the lower bounds for the packing densities of 1324 and 1342.
Jakub Sliacan, Walter Stromquist
doaj   +1 more source

Lower and upper bounds on independent double Roman domination in trees

open access: yesElectronic Journal of Graph Theory and Applications, 2022
For a graph G = (V, E), a double Roman dominating function (DRDF) f : V → {0, 1, 2, 3} has the property that for every vertex v ∈ V with f(v)=0, either there exists a neighbor u ∈ N(v), with f(u)=3, or at least two neighbors x, y ∈ N(v) having f(x)=f(y ...
M. Kheibari   +3 more
doaj   +1 more source

Lower and Upper Bounds for Nef Cones [PDF]

open access: yesInternational Mathematics Research Notices, 2011
25 pages, 4 figures.
Gibney, Angela, Maclagan, Diane
openaire   +2 more sources

Method of intermediate problems in the theory of Gaussian quantum dots placed in a magnetic field

open access: yesCondensed Matter Physics, 2006
Applicability of the method of intermediate problems to the investigation of the energy eigenvalues and eigenstates of a quantum dot (QD) formed by a Gaussian confining potential in the presence of an external magnetic field is discussed. Being smooth at
A.V.Soldatov   +2 more
doaj   +1 more source

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