3 papers
quant-ph2000
A Characterization of Completely-Positive Trace-Preserving Maps on 2x2 Matrices
M. B. Ruskai, E. Werner, S. Szarek
This paper has been superseded by quant-ph/0101003.
math-ph1999
One Dimensional Regularizations of the Coulomb Potential with Application to Atoms in Strong Magnetic Fields
Raymond Brummelhuis, Mary Beth Ruskai, Elisabeth Werner
We consider one-dimensional regularizations of the Coulomb potential formed by taking a two-dimensional expectation of the Coulomb potential with respect to the Landau states. It i…
math.CA1999
Study of a Class of Regularizations of 1/|x| using Gaussian Integrals
Mary Beth Ruskai, Elisabeth Werner
This paper presents a comprehensive study of a class of functions which approximate 1/|x| for large x but which are finite at the origin. These functions arise naturally in the stu…