Patents by Inventor Kensuke Inaba
Kensuke Inaba has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230334115Abstract: The present disclosure provides methods and systems for solving problems. Examples of problems include, but are not limited to, maximum clique problems.Type: ApplicationFiled: June 7, 2023Publication date: October 19, 2023Inventors: Ugur YILDIZ, Kensuke INABA, Pooya RONAGH, Artur SCHERER, Farhad KHOSRAVI, Pooja PANDEY
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Publication number: 20230176607Abstract: In an Ising model calculation device for computing a generalized Ising model expressed by a Hamiltonian having a magnetic field term, the magnetic field term is applied to spins simulated by state monitoring light pulses, and a response of the obtained light pulses is determined by fitting to perform state monitoring during application of a magnetic field term.Type: ApplicationFiled: April 23, 2020Publication date: June 8, 2023Inventors: Hiroki Takesue, Takahiro Inagaki, Toshimori Honjo, Kensuke Inaba, Yasuhiro Yamada, Takuya Ikuta
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Patent number: 11662647Abstract: The present invention provides an optical phase synchronization method characterized by involving applying a small phase modulation signal (dither signal) to local oscillator light, acquiring an error signal that is dependent on a phase shift, and controlling the phase shift. The present invention further provides an optical phase synchronization method characterized by involving inducing a specific phase pattern in dummy pulses in an optical resonator using injection light, applying phase modulation to the local oscillator light, and thereby acquiring a part of the measurement result of the dummy pulses as the error signal. The present invention is further characterized by arranging calculation pulses and phase synchronization dummy pulses in a distributed manner (for example, alternately) and increasing a pulse width using a narrow band electrical filter.Type: GrantFiled: August 28, 2019Date of Patent: May 30, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takuya Ikuta, Takahiro Inagaki, Kensuke Inaba, Toshimori Honjo, Hiroki Takesue
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Publication number: 20230153677Abstract: In order to address an issue that an unsolved problem is caused in a conventional coherent Ising machine in which a term, which expresses a magnetic field at each site, is not able to be implemented, the present invention provides an Ising model calculation device comprising a push-pull-type optical modulator in which a role corresponding to “a local magnetic field” can be implemented by adjusting an operation point. The calculation device of the present disclosure is characterized by implementing an item, which expresses a magnetic field, at each site by adding, to the conventional coherent Ising machine, a function for simulating the magnetic field item. Specifically, light having the amplitude of a predetermined sign is input in the conventional coherent Ising machine by dislocating an operation point of the push-pull-type optical modulator.Type: ApplicationFiled: April 2, 2021Publication date: May 18, 2023Inventors: Hiroki Takesue, Takahiro Inagaki, Toshimori Honjo, Kensuke Inaba, Shoko Utsunomiya, Shuhei Tamate
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Publication number: 20230102145Abstract: An XY model calculation apparatus of the present disclosure includes a resonator unit that amplifies a plurality of optical pulses, a measurement unit that measures phases and amplitudes of the plurality of optical pulses to obtain a measurement result, and a feedback configuration that calculates and feeds back an interaction related to a certain optical pulse of the plurality of optical pulses by using a coupling coefficient of an Ising model in response to the measurement result. The feedback configuration is configured to perform a feedback input of a correlation to be determined by a coupling coefficient of two optical pulses of the plurality of optical pulses and is configured so that only one component of pulsed light is to be measured.Type: ApplicationFiled: March 3, 2020Publication date: March 30, 2023Inventors: Kensuke Inaba, Hiroki Takesue, Toshimori Honjo, Takahiro Inagaki, Yasuhiro Yamada, Takuya Ikuta
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Publication number: 20220291568Abstract: The present invention provides an optical phase synchronization method characterized by involving applying a small phase modulation signal (dither signal) to local oscillator light, acquiring an error signal that is dependent on a phase shift, and controlling the phase shift. The present invention further provides an optical phase synchronization method characterized by involving inducing a specific phase pattern in dummy pulses in an optical resonator using injection light, applying phase modulation to the local oscillator light, and thereby acquiring a part of the measurement result of the dummy pulses as the error signal. The present invention is further characterized by arranging calculation pulses and phase synchronization dummy pulses in a distributed manner (for example, alternately) and increasing a pulse width using a narrow band electrical filter.Type: ApplicationFiled: August 28, 2019Publication date: September 15, 2022Inventors: Takuya Ikuta, Takahiro Inagaki, Kensuke Inaba, Toshimori Honjo, Hiroki Takesue
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Patent number: 11436394Abstract: A Potts model computing device capable of computing a Potts problem that is a multivalued spin problem are described herein. The Potts model computing device includes: an Ising model computing device; a computation result storage and determination unit configured to store a value of a spin of the Ising model obtained in a case where a coupling coefficient is set in the Ising model computing device and to determine whether a computation is finished; and a coupling coefficient overwriting unit configured to update a coupling coefficient generated based on the stored value of the spin to the Ising model computing device. According to a value of a set of spins obtained as a computation result corresponding to a coupling coefficient set for an m-th time in the Ising model computing device, the coupling coefficient overwriting unit generates again a coupling coefficient to be set for an (m+1)-th iterative computation.Type: GrantFiled: October 19, 2018Date of Patent: September 6, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kensuke Inaba, Hiroki Takesue, Toshimori Honjo, Takahiro Inagaki
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Patent number: 11385522Abstract: The Ising model calculation device selects a solution having a consistent quality from among solutions obtained through the calculations with the evaluation index of a calculation accuracy. A coupling coefficient obtained by combining the Ising model coupling coefficient corresponding to a problem for which a solution should be calculated with the Ising model coupling coefficient corresponding to the check problem is set as a coupling coefficient used to calculate the interaction. With regard to a calculation value corresponding to the check spin among the calculation values using a plurality of light pulses, the compatibility as the solution of the check problem is judged. When the judgement result shows the compatibility as the solution of the check problem, a calculation value other than the calculation values corresponding to the check spin among the resultant calculation values is outputted as a solution to the problem for which a solution should be calculated.Type: GrantFiled: October 19, 2018Date of Patent: July 12, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takahiro Inagaki, Hiroki Takesue, Toshimori Honjo, Kensuke Inaba
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Publication number: 20210326684Abstract: To provide a spiking neuron apparatus able to efficiently implement a simulation of a spiking neuron. A spiking neuron apparatus using a coherent Ising machine, the coherent Ising machine including: a resonator unit for amplifying a plurality of optical pulses; a measurement unit for measuring phases and amplitudes of the optical pulses to obtain a measurement result; and a feedback configuration for computing and feeding back an interaction related to a certain optical pulse using a coupling coefficient of Ising Model on the basis of the measurement result, the feedback configuration feedback inputting correlation determined by two coupling coefficients with opposite signs to two predetermined optical pulses of the optical pulses, the spiking neuron apparatus simulating a state of a spiking neuron using one of values of two optical pulses finally obtained by the measurement unit.Type: ApplicationFiled: August 30, 2019Publication date: October 21, 2021Inventors: Kensuke Inaba, Hiroki Takesue, Toshimori Honjo, Takahiro Inagaki, Takuya Ikuta
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Publication number: 20210088873Abstract: The Ising model calculation device selects a solution having a consistent quality from among solutions obtained through the calculations with the evaluation index of a calculation accuracy. A coupling coefficient obtained by combining the Ising model coupling coefficient corresponding to a problem for which a solution should be calculated with the Ising model coupling coefficient corresponding to the check problem is set as a coupling coefficient used to calculate the interaction. With regard to a calculation value corresponding to the check spin among the calculation values using a plurality of light pulses, the compatibility as the solution of the check problem is judged. When the judgement result shows the compatibility as the solution of the check problem, a calculation value other than the calculation values corresponding to the check spin among the resultant calculation values is outputted as a solution to the problem for which a solution should be calculated.Type: ApplicationFiled: October 19, 2018Publication date: March 25, 2021Inventors: Takahiro Inagaki, Hiroki Takesue, Toshimori Honjo, Kensuke Inaba
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Publication number: 20200279062Abstract: A Potts model computing device capable of computing a Potts problem that is a multivalued spin problem are described herein. The Potts model computing device includes: an Ising model computing device; a computation result storage and determination unit configured to store a value of a spin of the Ising model obtained in a case where a coupling coefficient is set in the Ising model computing device and to determine whether a computation is finished; and a coupling coefficient overwriting unit configured to update a coupling coefficient generated based on the stored value of the spin to the Ising model computing device. According to a value of a set of spins obtained as a computation result corresponding to a coupling coefficient set for an m-th time in the Ising model computing device, the coupling coefficient overwriting unit generates again a coupling coefficient to be set for an (m+1)-th iterative computation.Type: ApplicationFiled: October 19, 2018Publication date: September 3, 2020Inventors: Kensuke Inaba, Hiroki Takesue, Toshimori Honjo, Takahiro Inagaki