Takeshi Umeki

TL;DR: It is shown that an optical processing approach based on a network of coupled optical pulses in a ring fiber can be used to model and optimize large-scale Ising systems, and a coherent Ising machine outperformed simulated annealing in terms of accuracy and computation time for a 2000-node complete graph.

TL;DR: In this paper, the D-Wave quantum annealer outperforms the CIMs on MAX-CUT on cubic graphs, however, they observe an exponential penalty on denser problems, leading to a several orders of magnitude time-to-solution difference for instances with over 50 vertices.

TL;DR: In this paper, a fiber-coupled module using the fabricated ridge waveguide was developed to achieve a wavelength converter with + 4 dB fiber-to-fiber gain, which means the wavelength converter operates without loss.

TL;DR: In this paper, the performance of two types of annealing machines, a commercially available quantum annealer built by D-Wave Systems, and measurement-feedback coherent Ising machines (CIMs) based on optical parametric oscillator networks, were compared on two classes of problems, the Sherrington-Kirkpatrick (SK) model and MAX-CUT.

TL;DR: A χ(2)-based in-line PSA with a carrier-recovery and phase-locking system for a phase shift keying (PSK) signal and the regeneration of non-linear impairments induced by fiber non- linearity is demonstrated.