3 papers
cond-mat.stat-mech2026
Quasi-adiabatic thermal ensemble preparation in the thermodynamic limit
Tatsuhiko Shirai
We investigate a quasi-adiabatic thermal process for preparing finite-temperature ensembles in the thermodynamic limit. The process gradually transforms a thermal ensemble of a non…
quant-ph2025
Compressed space quantum approximate optimization algorithm for constrained combinatorial optimization
Tatsuhiko Shirai, Nozomu Togawa
Combinatorial optimization is a promising area for achieving quantum speedup. Quantum approximate optimization algorithm (QAOA) is designed to search for low-energy states of the I…
cond-mat.stat-mech2025
Out-of-time-order correlator computation based on discrete truncated Wigner approximation
Tatsuhiko Shirai, Takashi Mori
We propose a method based on the discrete truncated Wigner approximation (DTWA) for computing out-of-time-order correlators. This method is applied to long-range interacting quantu…