80 citations · 440 across the 45 of their papers we have counts for
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Transient Dynamics from Quantum to Classical- From the Developed Coherent State via Extreme Squeezing -
Masahiro Morikawa
We explore the transient dynamics associated with the emergence of the classical signal in the full quantum system. We start our study from the instability which promotes the squee…
Physics of quantum measurement and its interdisciplinary applications
Masahiro Morikawa, Akika Nakamichi
Quantum dynamics of the collective mode and individual particles on a ring is studied as the simplest model of projective quantum measurement. In this model, the collective mode me…
EPR measurement and the origin of cosmic density fluctuations
Masahiro Morikawa
We explore consistent application of quantum mechanics to the objects in the Universe and in laboratories. The measurement dynamics in quantum mechanics is modeled as a physical pr…
Quantum measurement driven by spontaneous symmetry breaking
Masahiro Morikawa, Akika Nakamichi
The measurement process in quantum mechanics is usually described by the von Neumann projection postulate, which forms a basic constituent of the laws of quantum mechanics. Since t…
Complete Resolution of the Quantum Zeno Paradox for Outside Observers
M. Hotta, M. Morikawa
The quantum Zeno paradox is fully resolved for purely indirect and incomplete measurements performed by the detectors outside the system. If the outside detectors are prepared to o…
Dissipative Quantum Tunneling from Quantum Potential Approach -- Back Reaction of Particle Creation --
Fumiaki Shibata, Masahiro Morikawa, Tetsuya Shiromizu +1
Back reaction of the particle creation on the quantum tunneling process is analyzed in real time formalism. We use quantum potential method in which whole quantum dynamics is exact…
Spontaneous dissipation from generalized radiative corrections
Masahiro Morikawa
We derive dissipative effective Hamiltonian for the unstable Lee model without any ad hoc coarse graining procedure. Generalized radiative corrections, utilizing the in-in formalis…