# Manaka Okuyama

Last updated: Apr 25, 2019 at 16:12

## Published Papers

Manaka Okuyama, Masayuki Ohzeki

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

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 ...