64 citations · 188 across the 15 of their papers we have counts for
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A classical limit of Grover's algorithm induced by dephasing: Coherence vs entanglement
Kazuo Fujikawa, C. H. Oh, Koichiro Umetsu
A new approach to the classical limit of Grover's algorithm is discussed by assuming a very rapid dephasing of a system between consecutive Grover's unitary operations, which drive…
Separability criteria with angular and Hilbert space averages
Kazuo Fujikawa, C. H. Oh, Koichiro Umetsu +1
The practically useful criteria of separable states in are discussed. The equality $G({\bf a},{\bf b})= 4[\langle ψ|P({\bf a})\otimes P({\bf b})…
A hidden-variables version of Gisin's theorem
Kazuo Fujikawa, Koichiro Umetsu
It is generally assumed that {\em local realism} represented by a noncontextual and local hidden-variables model in such as the one used by Bell always gives rise to CHSH ine…
Aspects of universally valid Heisenberg uncertainty relation
Kazuo Fujikawa, Koichiro Umetsu
A numerical illustration of a universally valid Heisenberg uncertainty relation, which was proposed recently, is presented by using the experimental data on spin-measurements by J.…
Uncertainty relation and probability: Numerical illustration
Kazuo Fujikawa, Koichiro Umetsu
The uncertainty relation and the probability interpretation of quantum mechanics are intrinsically connected, as is evidenced by the evaluation of standard deviations. It is thus n…
Clear evasion of the uncertainty relation with very small probability
Kazuo Fujikawa, Koichiro Umetsu
We entertain the idea that the uncertainty relation is not a principle, but rather it is a consequence of quantum mechanics. The uncertainty relation is then a probabilistic statem…