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5 papers · 1 filter
Matrices and -Stable Bipartite Graphs
Vadim E. Levit, Eugen Mandrescu
A square (0,1)-matrix X of order n > 0 is called fully indecomposable if there exists no integer k with 0 < k < n, such that X has a k by n-k zero submatrix. A stable set of a grap…
Security Aspects of Practical Quantum Cryptography
Gilles Brassard, Norbert Lütkenhaus, Tal Mor +1
The use of quantum bits (qubits) in cryptography holds the promise of secure cryptographic quantum key distribution schemes. Unfortunately, the implemented schemes can be totally i…
Chaotic enhancement of decay. The effect of classical phase space structure
Yosef Ashkenazy, Luca Bonci, Jacob Levitan +1
We investigate the decay process from a time dependent potential well in the semiclassical regime. The classical dynamics is chaotic and the decay rate shows an irregular behavior…
Scale Specific and Scale Independent Measures of Heart Rate Variability as Risk Indicators
Y. Ashkenazy, M. Lewkowicz, J. Levitan +7
We study the Heart Rate Variability (HRV) using scale specific variance and scaling exponents as measures of healthy and cardiac impaired individuals. Our results show that the var…
"Quantum phase transitions" in classical nonequilibrium processes
Eldad Bettelheim, Oded Agam, Nadav M. Shnerb
Diffusion limited reaction of the Lotka-Volterra type is analyzed taking into account the discrete nature of the reactants. In the continuum approximation, the dynamics is dominate…