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- Peter L McMahon, Alireza Marandi, +11 authors Yoshihisa Yamamoto
- Science
- 2016

Unconventional, special-purpose machines may aid in accelerating the solution of some of the hardest problems in computing, such as large-scale combinatorial optimizations, by exploiting different operating mechanisms than those of standard digital computers. We present a scalable optical processor with electronic feedback that can be realized at large… (More)

- Shoko Utsunomiya, Kenta Takata, Yoshihisa Yamamoto
- Optics express
- 2011

We propose a mapping protocol to implement Ising models in injection-locked laser systems. The proposed scheme is based on optical coherent feedback and can be potentially applied for large-scale Ising problems.

- Takahiro Inagaki, Yoshitaka Haribara, +14 authors Hiroki Takesue
- Science
- 2016

The analysis and optimization of complex systems can be reduced to mathematical problems collectively known as combinatorial optimization. Many such problems can be mapped onto ground-state search problems of the Ising model, and various artificial spin systems are now emerging as promising approaches. However, physical Ising machines have suffered from… (More)

- Tim Byrnes, Patrik Recher, Na Young Kim, Shoko Utsunomiya, Yoshihisa Yamamoto
- Physical review letters
- 2007

An experimental scheme for a quantum simulator of strongly correlated electrons is proposed. Our scheme employs electrons confined in a two-dimensional electron gas in a GaAs/AlGaAs heterojunction. Two surface acoustic waves are then induced in the substrate, creating a two-dimensional "egg-carton" potential. The dynamics of the electrons in this potential… (More)

- Yoshitaka Haribara, Shoko Utsunomiya, Yoshihisa Yamamoto
- Entropy
- 2016

We present the operational principle of a coherent Ising machine (CIM) based on a degenerate optical parametric oscillator (DOPO) network. A quantum theory of CIM is formulated, and the computational ability of CIM is evaluated by numerical simulation based on c-number stochastic differential equations. We also discuss the advanced CIM with quantum… (More)

- Shoko Utsunomiya, Naoto Namekata, Kenta Takata, Daisuke Akamatsu, Shuichiro Inoue, Yoshihisa Yamamoto
- Optics express
- 2015

A two-site Ising model is implemented as an injection-locked laser network consisting of a single master laser and two mutually coupled slave lasers. We observed ferromagnetic and antiferromagnetic orders in the in-phase and out-of-phase couplings between the two slave lasers. Their phase difference is locked to either 0 or π even if the coupling path is… (More)

- Yoshihisa Yamamoto, Kenta Takata, Shoko Utsunomiya
- New Generation Computing
- 2012

In this review article, we compare the performance of two computing systems: quantum computing and coherent computing. A layered architecture for circuit-model quantum computing, employing surface code quantum error correction, has been recently discussed. Using this concrete hardware platform, it is possible to provide resource analysis for executing the… (More)

- Kenta Takata, Alireza Marandi, +6 authors Yoshihisa Yamamoto
- 2016

Many tasks in our modern life, such as planning an efficient travel, image processing and optimizing integrated circuit design, are modeled as complex combinatorial optimization problems with binary variables. Such problems can be mapped to finding a ground state of the Ising Hamiltonian, thus various physical systems have been studied to emulate and solve… (More)

A structure-based lead optimization procedure is an essential step to finding appropriate ligand molecules binding to a target protein structure in order to identify drug candidates. This procedure takes a known structure of a protein-ligand complex as input, and structurally similar compounds with the query ligand are designed in consideration with all… (More)

- Timothée Leleu, Yoshihisa Yamamoto, Shoko Utsunomiya, Kazuyuki Aihara
- Physical review. E
- 2017

The dynamics of driven-dissipative systems is shown to be well-fitted for achieving efficient combinatorial optimization. The proposed method can be applied to solve any combinatorial optimization problem that is equivalent to minimizing an Ising Hamiltonian. Moreover, the dynamics considered can be implemented using various physical systems as it is based… (More)

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