196 citations · 2.3k across the 104 of their papers we have counts for
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Graph minor embedding can affect sampling degenerate ground states using quantum annealing
Naoki Maruyama, Masayuki Ohzeki, Kazuyuki Tanaka
Quantum annealing, as currently implemented in hardware, cannot fairly sample all ground states. Graph minor embedding, which maps a problem to the hardware graph of quantum anneal…
Combinatorial Black-box Optimization for Vehicle Design Problem
Ami S. Koshikawa, Masayuki Ohzeki, Masamichi J. Miyama +4
Black-box optimization minimizes an objective function without derivatives or explicit forms. Such an optimization method with continuous variables has been successful in the field…
Stochastic dynamics without detailed balance condition connecting simple gradient method and Hamiltonian Monte Carlo
Akihisa Ichiki, Masayuki Ohzeki
Sampling occupies an important position in theories of various scientific fields, and Markov chain Monte Carlo (MCMC) provides the most common technique of sampling. In the progres…
Upper bound inequality for calculation time in simulated annealing analogous to adiabatic theorem in quantum systems
Akihisa Ichiki, Masayuki Ohzeki
It has been recently reported that classical systems have speed limit for state evolution, although such a concept of speed limit had been considered to be unique to quantum system…
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…
Benchmark test of Black-box optimization using D-Wave quantum annealer
Ami S. Koshikawa, Masayuki Ohzeki, Tadashi Kadowaki +1
In solving optimization problems, objective functions generally need to be minimized or maximized. However, objective functions cannot always be formulated explicitly in a mathemat…
Assessment of image generation by quantum annealer
Takehito Sato, Masayuki Ohzeki, Kazuyuki Tanaka
Quantum annealing was originally proposed as an approach for solving combinatorial optimisation problems using quantum effects. D-Wave Systems has released a production model of qu…
Kernel-based framework to estimate deformations of pneumothorax lung using relative position of anatomical landmarks
Utako Yamamoto, Megumi Nakao, Masayuki Ohzeki +3
In video-assisted thoracoscopic surgeries, successful procedures of nodule resection are highly dependent on the precise estimation of lung deformation between the inflated lung in…
Teacher-student learning for a binary perceptron with quantum fluctuations
Shunta Arai, Masayuki Ohzeki, Kazuyuki Tanaka
We analysed the generalisation performance of a binary perceptron with quantum fluctuations using the replica method. An exponential number of local minima dominate the energy land…