137 citations · 286 across the 9 of their papers we have counts for
9 papers
Effectiveness of quantum annealing for continuous-variable optimization
Shunta Arai, Hiroki Oshiyama, Hidetoshi Nishimori
The application of quantum annealing to the optimization of continuous-variable functions is a relatively unexplored area of research. We test the performance of quantum annealing…
Kernel Learning by quantum annealer
Yasushi Hasegawa, Hiroki Oshiyama, Masayuki Ohzeki
The Boltzmann machine is one of the various applications using quantum annealer. We propose an application of the Boltzmann machine to the kernel matrix used in various machine-lea…
Mirror-symmetry-protected dynamical quantum phase transitions in topological crystalline insulators
Ryo Okugawa, Hiroki Oshiyama, Masayuki Ohzeki
Dynamical quantum phase transitions (DQPTs) are topologically characterized in quantum quench dynamics in topological systems. In this paper, we study Loschmidt amplitudes and DQPT…
Benchmark of quantum-inspired heuristic solvers for quadratic unconstrained binary optimization
Hiroki Oshiyama, Masayuki Ohzeki
Recently, inspired by quantum annealing, many solvers specialized for unconstrained binary quadratic programming problems have been developed. For further improvement and applicati…
Classical simulation and theory of quantum annealing in a thermal environment
Hiroki Oshiyama, Sei Suzuki, Naokazu Shibata
We study quantum annealing in the quantum Ising model coupled to a thermal environment. When the speed of quantum annealing is sufficiently slow, the system evolves following the i…
Ground-state phase diagram of the one-dimensional -- model at quarter filling
Yuya Kurebayashi, Hiroki Oshiyama, Naokazu Shibata
We study the ground state of the one-dimensional "-- model," which is a variant of the - model with additional channel degree of freedom. The model is not only a…
Kibble-Zurek mechanism in a Dissipative Transverse Ising Chain
Hiroki Oshiyama, Naokazu Shibata, Sei Suzuki
We study the Kibble-Zurek mechanism in the transverse Ising chain coupled to a dissipative boson bath, making use of a new numerical method with the infinite time evolving block de…
Probing the Universality of Topological Defect Formation in a Quantum Annealer: Kibble-Zurek Mechanism and Beyond
Yuki Bando, Yuki Susa, Hiroki Oshiyama +7
The number of topological defects created in a system driven through a quantum phase transition exhibits a power-law scaling with the driving time. This universal scaling law is th…
Quantum annealing of pure and random Ising chains coupled to a bosonic environment
Sei Suzuki, Hiroki Oshiyama, Naokazu Shibata
We study quantum annealing of pure and random transverse Ising chains that are coupled to boson baths, using a novel numerical method based on the combination of the quasi-adiabati…