Manaka Okuyama

J-GLOBAL         Last updated: Oct 4, 2019 at 13:43
Manaka Okuyama
Tohoku University

Published Papers

Manaka Okuyama, Masayuki Ohzeki
arXiv      Aug 2018
Suzuki-Trotter decomposition is a well-known technique used to calculate the
partition function of quantum spin systems, in which the imaginary-time
dependence of the partition function occurs inevitably. Since it is very
difficult to explicitly t...
Manaka Okuyama, Masayuki Ohzeki
Journal of Physics A: Mathematical and Theoretical      Aug 2018   [Refereed]
Manaka Okuyama, Masayuki Ohzeki
   Jun 2018
The quantum speed limit (QSL), or the energy-time uncertainty relation, gives
a fundamental speed limit for quantum dynamics. Recently, Kieu
[arXiv:1702.00603] derived a new class of QSL which is not only formal but also
suitable for actually eval...
Manaka Okuyama, Ryo Takahashi, Masayuki Ohzeki
arXiv      Feb 2018
Deffner and Lutz [J. Phys. A 46, 335302 (2013) and Phys. Rev. Lett. 111,
010402 (2013).] extended the Mandelstam-Tamm bound and the Margolus-Levitin
bound to time-dependent and non-Markovian systems, respectively. Although the
derivation of the Ma...
Manaka Okuyama, Masayuki Ohzeki
Phys. Rev. Lett. 120, 070402 (2018)      Oct 2017
The quantum speed limit (QSL), or the energy-time uncertainty relation,
describes the fundamental maximum rate for quantum time evolution and has been
regarded as being unique in quantum mechanics. In this study, we obtain a
classical speed limit ...

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