29 citations · 72 across the 9 of their papers we have counts for
9 papers
Extended Feynman Formula for the Harmonic Oscillator by the Discrete Time Method
Kunio Funahashi
We calculate the Feynman formula for the harmonic oscillator beyond and at caustics by the discrete formulation of path integral. The extension has been made by some authors, howev…
Jarlskog's Parametrization of Unitary Matrices and Qudit Theory
Kazuyuki Fujii, Kunio Funahashi, Takayuki Kobayashi
In the paper (math-ph/0504049) Jarlskog gave an interesting simple parametrization to unitary matrices, which was essentially the canonical coordinate of the second kind in the Lie…
The Controlled-U and Unitary Transformation in Two-Qudit
Kunio Funahashi
We concretely construct an extension of the controlled-U gate in qudit from some elementary gates. We also construct unitary transformation in two-qudit by means of the extended co…
Extension of the Barut-Girardello Coherent State and Path Integral II
Kazuyuki Fujii, Kunio Funahashi
We have constructed the coherent state of , which is an extension of the Barut-Girardello (BG) coherent state of , in our previous paper. However there is a restri…
Extension of the Barut-Girardello Coherent State and Path Integral
Kazuyuki Fujii, Kunio Funahasi
We extend the Barut-Girardello coherent state for the representation of to the coherent state for a representation of and construct the measure. We also construc…
Multi-Periodic Coherent States and the WKB-Exactness II ``Non-compact Case and Classical theories Revisited''
Kazuyuki Fujii, Kunio Funahashi
We show that the WKB approximation gives the exact result in the trace formula of ``'', which is the non-compact counterpart of , in terms of the ``multi-periodic'' coh…