Zobrazeno 1 - 10
of 53
pro vyhledávání: '"TATSUHIKO KOIKE"'
Autor:
Hiroaki Wakamura, Tatsuhiko Koike
Publikováno v:
New Journal of Physics, Vol 22, Iss 7, p 073010 (2020)
We present a general theoretical framework for finding the time-optimal unitary evolution of the quantum systems when the Hamiltonian is subject to arbitrary constraints. Quantum brachistochrone (QB) is such a framework based on the variational princ
Externí odkaz:
https://doaj.org/article/e10eae9a7a9a4e288b0b4bf4db48ff8c
Autor:
Tatsuhiko Koike
Publikováno v:
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences. 380(2239)
Quantum brachistochrone (QB) is a quantum analogue of classical brachistochrone (shortest path). It is a solution to the following problem: How can we perform a desired quantum operation (or obtain a desired final quantum state) most quickly, by a ti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::328a132629f7067d4e26b80fcf96d0bc
https://pubmed.ncbi.nlm.nih.gov/36335942
https://pubmed.ncbi.nlm.nih.gov/36335942
Autor:
Tatsuhiko Koike, Hiroaki Wakamura
Publikováno v:
New Journal of Physics. 22:073010
We present a general theoretical framework for finding the time-optimal unitary evolution of the quantum systems when the Hamiltonian is subject to arbitrary constraints. Quantum brachistochrone (QB) is such a framework based on the variational princ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d42b485964cf73ec31ac09e8184c270
https://doi.org/10.1088/1367-2630/ab8ab3
https://doi.org/10.1088/1367-2630/ab8ab3
We present a framework for reducing all possible cohomogeneity-one strings, i.e., strings with geometrical symmetry, in a given spacetime to mechanical systems, and for analyzing integrability of the systems. As applications, it is clarified whether
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5dc7030f8fa21a35bdda778c21a27456
http://arxiv.org/abs/1709.07659
http://arxiv.org/abs/1709.07659
Publikováno v:
Physical Review A. 96
We discuss the possibility of protecting the state of a quantum system that goes through noise by measurements and operations before and after the noise process. We extend our previous result on nonexistence of "truly quantum" protocols that protect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a2d10e1ff7845c45bd726263cd39e68d
https://doi.org/10.1103/physreva.96.022325
https://doi.org/10.1103/physreva.96.022325
We discuss the possibility of protecting the state of a quantum system that goes through noise, by measurements/operations before and after the noise process. The aim is to seek for the optimal protocol that makes the input and output states as close
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d1a2e1b49ea2ddc730fcfc88a79a2e0
Autor:
Tatsuhiko Koike, A. Carlini
Publikováno v:
Journal of physics. A, Mathematical and theoretical (Online) 50 (2017). doi:10.1088/1751-8121/aa59df
info:cnr-pdr/source/autori:Carlini A.; Koike T./titolo:Brachistochrone of entanglement for spin chains/doi:10.1088%2F1751-8121%2Faa59df/rivista:Journal of physics. A, Mathematical and theoretical (Online)/anno:2017/pagina_da:/pagina_a:/intervallo_pagine:/volume:50
info:cnr-pdr/source/autori:Carlini A.; Koike T./titolo:Brachistochrone of entanglement for spin chains/doi:10.1088%2F1751-8121%2Faa59df/rivista:Journal of physics. A, Mathematical and theoretical (Online)/anno:2017/pagina_da:/pagina_a:/intervallo_pagine:/volume:50
We analytically investigate the role of entanglement in time-optimal state evolution as an appli- cation of the quantum brachistochrone, a general method for obtaining the optimal time-dependent Hamiltonian for reaching a target quantum state. As a m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41dc2a114bcf19ec7ddf2b9c317e03d8
http://www.scopus.com/inward/record.url?eid=2-s2.0-85013059708&partnerID=q2rCbXpz
http://www.scopus.com/inward/record.url?eid=2-s2.0-85013059708&partnerID=q2rCbXpz
Autor:
Tatsuhiko Koike, Ryûitirô Kawakubo
Condition for distinguishability of countably infinite number of pure states by a single measurement is given. Distinguishability is to be understood as possibility of an unambiguous measurement. For finite number of states, it is known that the nece
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cae1eacb6b347843370c102954693a15
Autor:
TAKAHISA IGATA1 koike@phys.keio.ac.jp, TATSUHIKO KOIKE2 igata@sci.osaka-cu.ac.jp, HIDEKI ISHIHARA1 ishihara@sci.osaka-cu.ac.jp
Publikováno v:
Twelfth Marcel Grossmann Meeting, The: on Recent Developments in Theoretical & Experimental General Relativity, Astrophysics & Relativistic Field Theories (In 3 Volumes) - Proceedings of the Mg12 Meeting on General Relativity. 2012, p1026-1028. 3p.
Publikováno v:
Physical Review D. 91
We study the dynamics of the Nambu-Goto membranes with cohomogeneity one symmetry, i.e., the membranes whose trajectories are foliated by homogeneous surfaces. It is shown that the equation of motion reduces to a geodesic equation on a certain manifo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb616632e4772fe85d67a45a057e7fbd
https://doi.org/10.1103/physrevd.91.025007
https://doi.org/10.1103/physrevd.91.025007