161 citations · 261 across the 22 of their papers we have counts for
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Threshold theorem in quantum annealing with deterministic analog control errors
Manaka Okuyama, Masayuki Ohzeki
We investigate the effect of deterministic analog control errors in the time-dependent Hamiltonian on isolated quantum dynamics. Deterministic analog control errors are formulated…
Threshold theorem in isolated quantum dynamics with stochastic control errors
Manaka Okuyama, Kentaro Ohki, Masayuki Ohzeki
We investigate the effect of stochastic control errors in the time-dependent Hamiltonian on isolated quantum dynamics. The control errors are formulated as time-dependent stochasti…
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…
Quantum Speed Limit is Not Quantum
Manaka Okuyama, Masayuki Ohzeki
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 q…
From Classical Nonlinear Integrable Systems to Quantum Shortcuts to Adiabaticity
Manaka Okuyama, Kazutaka Takahashi
Using shortcuts to adiabaticity, we solve the time-dependent Schroedinger equation that is reduced to a classical nonlinear integrable equation. For a given time-dependent Hamilton…
Anomalous behavior of the energy gap in the one-dimensional quantum XY model
Manaka Okuyama, Yuuki Yamanaka, Hidetoshi Nishimori +1
We re-examine the well-studied one dimensional spin-1/2 model to reveal its nontrivial energy spectrum, in particular the energy gap between the ground state and the first exc…
Anomalous behavior of the energy gap in the one-dimensional quantum XY model
Yuuki Yamanaka, Hidetoshi Nishimori
We show for the one-dimensional quantum model with that the energy gap between the ground and first excited states behaves anomalously as a function of the system size…