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13 results on '"Nakazato H"'

12. Exactly solvable time-dependent models of two interacting two-level systems

Author

Roberto Grimaudo, Antonino Messina, Hiromichi Nakazato, Grimaudo, R., Messina, A., and Nakazato, H.

Subjects
Physics, Quantum Physics, Time evolution, FOS: Physical sciences, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas, Magnetic field, symbols.namesake, Classical mechanics, 0103 physical sciences, symbols, Compound system, Quantum Physics (quant-ph), 010306 general physics, Hamiltonian (quantum mechanics)
Abstract

Two coupled two-level systems placed under external time-dependent magnetic fields are modeled by a general Hamiltonian endowed with a symmetry that enables us to reduce the total dynamics into two independent two-dimensional sub-dynamics. Each of the sub-dynamics is shown to be brought into an exactly solvable form by appropriately engineering the magnetic fields and thus we obtain an exact time evolution of the compound system. Several physically relevant and interesting quantities are evaluated exactly to disclose intriguing phenomena in such a system., Comment: 15 pages, 13 figures

Published
2016

13. Distillation of entanglement between distant systems by repeated measurements on an entanglement mediator

Author

Giuseppe Compagno, Antonino Messina, Kazuya Yuasa, Anna Napoli, Hiromichi Nakazato, Makoto Unoki, COMPAGNO G, MESSINA A, NAKAZATO H, NAPOLI A, UNOKI M, and YUASA K

Subjects
Physics, Quantum Physics, FOS: Physical sciences, Quantum entanglement, Information theory, Multipartite entanglement, Atomic and Molecular Physics, and Optics, law.invention, law, Yield (chemistry), Quantum mechanics, Statistical physics, Purification methods, Quantum Physics (quant-ph), Distillation, effects, decay, survival probability
Abstract

A recently proposed purification method, in which the Zeno-like measurements of a subsystem can bring about a distillation of another subsystem in interaction with the former, is utilized to yield entangled states between distant systems. It is shown that the measurements of a two-level system locally interacting with other two spatially separated not coupled subsystems, can distill entangled states from the latter irrespectively of the initial states of the two subsystems., Comment: 11 pages, 2 figures; the version accepted for publication in Phys. Rev. A

Published
2004

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