161 citations · 261 across the 22 of their papers we have counts for
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cond-mat.stat-mech2018★ 2 cited
An exact solution of the partition function for mean-field quantum spin systems without the static approximation
Manaka Okuyama, Masayuki Ohzeki
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 fun…
cond-mat.stat-mech2018
A useful fundamental speed limit for the imaginary-time Schrodinger equation
Manaka Okuyama, Masayuki Ohzeki
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…
quant-ph2018
Comment on "Energy-time uncertainty relation for driven quantum systems" and "Quantum Speed Limit for Non-Markovian Dynamics"
Manaka Okuyama, Ryo Takahashi, Masayuki Ohzeki
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…