57 citations · 171 across the 9 of their papers we have counts for
7 papers · 1 filter
Vacuum charge fractionlization re-examined
Y. Nogami
We consider a model of a quantized fermion field that is based on the Dirac equation in one dimensional space and re-examine how the fermion number of the vacuum, or the vacuum cha…
Multi-phase matching in the Grover algorithm
F. M. Toyama, W. van Dijk, Y. Nogami +2
Phase matching has been studied for the Grover algorithm as a way of enhancing the efficiency of the quantum search. Recently Li and Li found that a particular form of phase matchi…
Dirac's hole theory versus quantum field theory
F. A. B. Coutinho, D. Kiang, Y. Nogami +1
Dirac's hole theory and quantum field theory are usually considered equivalent to each other. For models of a certain type, however, the equivalence may not hold as we discuss in t…
Bohmian description of a decaying quantum system
Y. Nogami, F. M. Toyama, W. van Dijk
We present a Bohmian description of a decaying quantum system. A particle is initially confined in a region around the origin which is surrounded by a repulsive potential barrier.…
Many-body system with a four-parameter family of point interactions in one dimension
F A B Coutinho, Y Nogami, Lauro Tomio
We consider a four-parameter family of point interactions in one dimension. This family is a generalization of the usual -function potential. We examine a system consisting of m…
Two definitions of the electric polarizability of a bound system in relativistic quantum theory
F. A. B. Coutinho, Y. Nogami, Lauro Tomio
For the electric polarizability of a bound system in relativistic quantum theory, there are two definitions that have appeared in the literature. They differ depending on whether o…
Validity of Feynman's prescription of disregarding the Pauli principle in intermediate states
F. A. B. Coutinho, Y. Nogami, Lauro Tomio
Regarding the Pauli principle in quantum field theory and in many-body quantum mechanics, Feynman advocated that Pauli's exclusion principle can be completely ignored in intermedia…