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7 papers · 2 filters
Attainable entanglement of unitary transformed thermal states in liquid-state nuclear magnetic resonance with the chemical shift
Yukihiro Ota, Shuji Mikami, Motoyuki Yoshida +1
Recently, Yu, Brown, and Chuang [Phys. Rev. A {\bf 71}, 032341 (2005)] investigated the entanglement attainable from unitary transformed thermal states in liquid-state nuclear magn…
On the Magic Matrix by Makhlin and the B-C-H Formula in SO(4)
Kazuyuki Fujii, Tatsuo Suzuki
A closed expression to the Baker-Campbell-Hausdorff (B-C-H) formula in SO(4) is given by making use of the magic matrix by Makhlin. As far as we know this is the {\bf first nontriv…
Zero energy resonance and the logarithmically slow decay of unstable multilevel systems
Manabu Miyamoto
The long time behavior of the reduced time evolution operator for unstable multilevel systems is studied based on the N-level Friedrichs model in the presence of a zero energy reso…
More on the Isomorphism
Kazuyuki Fujii, Hiroshi Oike, Tatsuo Suzuki
In this paper we revisit the isomorphism to apply to some subjects in Quantum Computation and Mathematical Physics. The unitary matrix by Makhli…
Solution of the Lindblad Equation in the Kraus Representation
H. Nakazato, Y. Hida, K. Yuasa +3
The so-called Lindblad equation, a typical master equation describing the dissipative quantum dynamics, is shown to be solvable for finite-level systems in a compact form without r…
On the Assumption of Initial Factorization in the Master Equation for Weakly Coupled Systems II: Solvable Models
K. Yuasa, S. Tasaki, P. Facchi +4
We analyze some solvable models of a quantum mechanical system in interaction with a reservoir when the initial state is not factorized. We apply Nakajima-Zwanzig's projection meth…