Kensuke Inaba
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View article: Finding independent sets in large-scale graphs with a coherent Ising machine
Finding independent sets in large-scale graphs with a coherent Ising machine Open
Combinatorial optimizers using physical systems, or “Ising machines,” have been intensively studied as a way of computation that is more efficient than current digital computers. Here, we demonstrate that a coherent Ising machine (CIM) bas…
View article: High-Speed Resource Allocation Algorithm Using a Coherent Ising Machine for NOMA Systems
High-Speed Resource Allocation Algorithm Using a Coherent Ising Machine for NOMA Systems Open
Non-orthogonal multiple access (NOMA) technique is important for achieving a high data rate in next-generation wireless communications. A key challenge to fully utilizing the effectiveness of the NOMA technique is the optimization of the r…
View article: 10-GHz-clock time-multiplexed non-degenerate optical parametric oscillator network with a variable planar lightwave circuit interferometer
10-GHz-clock time-multiplexed non-degenerate optical parametric oscillator network with a variable planar lightwave circuit interferometer Open
A coherent XY machine (CXYM) is a physical spin simulator that can simulate the XY model by mapping XY spins onto the continuous phases of non-degenerate optical parametric oscillators (NOPOs). Here, we demonstrated a large-scale CXYM with…
View article: Experimental observation of chimera states in spiking neural networks based on degenerate optical parametric oscillators
Experimental observation of chimera states in spiking neural networks based on degenerate optical parametric oscillators Open
The phenomenon of partial synchronization has attracted significant interest in the field of nonlinear dynamics, largely due to observations of related phenomena in real-world situations. In particular, the coexistence of synchronized and …
View article: Detecting partial synchrony in a complex oscillatory network using pseudo-vortices
Detecting partial synchrony in a complex oscillatory network using pseudo-vortices Open
Partial synchronization is characteristic phase dynamics of coupled oscillators on various natural and artificial networks, which can remain undetected due to the complexity of the systems. With an analogy between pairwise asynchrony of os…
View article: Thermodynamic quantities of two-dimensional Ising models obtained by noisy mean field annealing and coherent Ising machine
Thermodynamic quantities of two-dimensional Ising models obtained by noisy mean field annealing and coherent Ising machine Open
Noisy mean field annealing (NMFA) is an algorithm that mimics a coherent Ising machine (CIM), which is an optical system for solving Ising problems. The NMFA has reproduced the solver performance of the CIM for systems of limited size even…
View article: Observing a Phase Transition in a Coherent Ising Machine
Observing a Phase Transition in a Coherent Ising Machine Open
A coherent Ising machine (CIM) is known to deliver the low-energy states of the Ising model. Here, we investigate how well the CIM simulates the thermodynamic properties of a two-dimensional square-lattice Ising model. Assuming that the sp…
View article: High-Speed Resource Allocation Algorithm Using a Coherent Ising Machine for NOMA Systems
High-Speed Resource Allocation Algorithm Using a Coherent Ising Machine for NOMA Systems Open
Non-orthogonal multiple access (NOMA) technique is important for achieving a high data rate in next-generation wireless communications. A key challenge to fully utilizing the effectiveness of the NOMA technique is the optimization of the r…
View article: Experimental observation of chimera states in spiking neural networks based on degenerate optical parametric oscillators
Experimental observation of chimera states in spiking neural networks based on degenerate optical parametric oscillators Open
We experimentally demonstrate that networks of identical photonic spiking neurons based on coupled degenerate parametric oscillators can show various chimera states, in which, depending on their local synchronization and desynchronization,…
View article: Potts model solver based on hybrid physical and digital architecture
Potts model solver based on hybrid physical and digital architecture Open
The Potts model describes Ising-model-like interacting spin systems with multivalued spin components, and ground-state search problems of the Potts model can be efficiently mapped onto various integer optimization problems thanks to the ri…
View article: 100,000-spin coherent Ising machine
100,000-spin coherent Ising machine Open
We constructed a large optical computer based on optical parametric oscillators coupled via measurement and feedback.
View article: A High-Speed Channel Assignment Algorithm for Dense IEEE 802.11 Systems via Coherent Ising Machine
A High-Speed Channel Assignment Algorithm for Dense IEEE 802.11 Systems via Coherent Ising Machine Open
This letter reports on an ultra-fast and accurate channel assignment approach using a coherent Ising machine (CIM) for dense wireless LAN (WLAN) systems. CIM is a laser-based high-speed hardware approach for solving Ising problems using op…
View article: Performance Comparison between Coherent Ising Machines and Quantum Annealer
Performance Comparison between Coherent Ising Machines and Quantum Annealer Open
NTT has been developing a coherent Ising machine (CIM), which efficiently finds solutions to groundstate-search problems of the Ising model using a network of optical parametric oscillators.We introduce our recent experiment that compared …
View article: Continuous and long-term stabilization of degenerate optical parametric oscillators for large-scale optical hybrid computers
Continuous and long-term stabilization of degenerate optical parametric oscillators for large-scale optical hybrid computers Open
The minimum requirements for an optical reservoir computer, a recent paradigm for computation using simple algorithms, are nonlinearity and internal interactions. A promising optical system satisfying these requirements is a platform based…
View article: Experimental determination of Bose-Hubbard energies
Experimental determination of Bose-Hubbard energies Open
We present the first experimental measurement of the ensemble averages of both the kinetic and interaction energies of the three-dimensional Bose--Hubbard model at finite temperature and various optical lattice depths across weakly to stro…
View article: Scaling advantages of all-to-all connectivity in physical annealers: the Coherent Ising Machine vs. D-Wave 2000Q
Scaling advantages of all-to-all connectivity in physical annealers: the Coherent Ising Machine vs. D-Wave 2000Q Open
Physical annealing systems provide a heuristic approach to solve NP-hard Ising optimization problems. It is believed that the connectivity between spins in such annealers significantly impacts the machine's computational effectiveness. In …
View article: Quantum Neural Network for Solving Complex Combinatorial Optimization Problems
Quantum Neural Network for Solving Complex Combinatorial Optimization Problems Open
Optimization of various social systems, including communication, traffic, and social networking systems, requires the solving of complex combinatorial optimization problems.In this article, we describe the recent progress achieved in devel…
View article: Laser spectroscopic probing of coexisting superfluid and insulating states of an atomic Bose–Hubbard system
Laser spectroscopic probing of coexisting superfluid and insulating states of an atomic Bose–Hubbard system Open
A system of ultracold atoms in an optical lattice has been regarded as an ideal quantum simulator for a Hubbard model with extremely high controllability of the system parameters. While making use of the controllability, a comprehensive me…
View article: Theoretical analysis of the spectroscopy of atomic Bose-Hubbard systems
Theoretical analysis of the spectroscopy of atomic Bose-Hubbard systems Open
We provide a numerical method to calculate comprehensively the microwave and\nthe laser spectra of ultracold bosonic atoms in optical lattices at finite\ntemperatures. Our formulation is built up with the sum rules, up to the second\norder…
View article: BCS superconducting transitions in lattice fermions
BCS superconducting transitions in lattice fermions Open
We develop a general description of the superconductivity of lattice fermions based on the BCS theory. We propose a modeling of the density of states (DOS) of lattice fermions, where divergent and semi-metallic structures are described by …
View article: Magnetism in the three-dimensional layered Lieb lattice: Enhanced transition temperature via flat-band and Van Hove singularities
Magnetism in the three-dimensional layered Lieb lattice: Enhanced transition temperature via flat-band and Van Hove singularities Open
We describe the enhanced magnetic transition temperatures $T_c$ of two-component fermions in three-dimensional layered Lieb lattices, which are created in cold atom experiments. We determine the phase diagram at half-filling using the dyna…