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Phase transitions in the frustrated Ising ladder with stoquastic and nonstoquastic catalysts
Kabuki Takada, Shigetoshi Sota, Seiji Yunoki +3
The role of nonstoquasticity in the field of quantum annealing and adiabatic quantum computing is an actively debated topic. We study a strongly-frustrated quasi-one-dimensional qu…
Discretized quantum adiabatic process for free fermions and comparison with the imaginary-time evolution
Tomonori Shirakawa, Kazuhiro Seki, Seiji Yunoki
Motivated by recent progress of quantum technologies, we study a discretized quantum adiabatic process for a one-dimensional free fermion system described by a variational wave fun…
Quantum Power Method by a Superposition of Time-Evolved States
Kazuhiro Seki, Seiji Yunoki
We propose a quantum-classical hybrid algorithm of the power method, here dubbed as quantum power method, to evaluate with quantum computers, where i…
Emergence of a thermal equilibrium in a subsystem of a pure ground state by quantum entanglement
Kazuhiro Seki, Seiji Yunoki
By numerically exact calculations of spin-1/2 antiferromagnetic Heisenberg models on small clusters, we demonstrate that quantum entanglement between subsystems and in a pu…