4 papers
Reduction of the energy-gap scaling by coherent catalysis in models of quantum annealing
Yang Wei Koh, Hidetoshi Nishimori
Non-stoquastic drivers are known to improve the performance of quantum annealing by reducing first-order phase transitions into second-order ones in several mean-field-type model s…
Effects of dynamical paths on the energy gap and the corrections to free energy in path integrals of mean-field quantum spin systems
Yang Wei Koh
In current studies of mean-field quantum spin systems, much attention is placed on the calculation of the ground-state energy and the excitation gap, especially the latter which pl…
Non-static effects in ordered and disordered quantum spin systems I: theoretical formulation, energy gap and non-extensive terms of ground-state energy of the ferromagnetic Ising model in a transverse field
Yang Wei Koh
In the path integral formulation of the partition function of quantum spin models, most current treatments employ the so-called static approximation to simplify the process of summ…
Effects of low-lying excitations on ground-state energy and energy gap of Sherrington-Kirkpatrick model in transverse field
Yang Wei Koh
We present an extensive numerical study of the Sherrington-Kirkpatrick model in transverse field. Recent numerical studies of quantum spin-glasses have focused on exact diagonaliza…