Kabushiki Kaisha Toshiba

Nec Corporation

Toshiba Digital Solutions Corporation

Hayato Goto

Kouichi Ichimura

Kosuke Tatsumura

Taro Kanao

Satoshi Nakamura

Ryo Hidaka

Masaya Yamasaki

Mamiko Kujiraoka

Yoshisato Sakai

Masaru Suzuki

Koichi Mizushima

Rie Sato

Noritsugu Shiokawa

Satoshi Mitsugi

Kotaro Endo

Hironori Uchikawa

Tazumi Nagasawa

Hirofumi Suto

Tsuyoshi Yamamoto

Kiwamu Kudo

Tamio Kawaguchi

Kenji Ohkuma

Kentaro Torii

Yinghao Ho

Michinaga Yamagishi

Mikio Fujii

Yohei Hamakawa

According to one embodiment, a coupler includes first to fourth capacitors, first and second inductors, and a first Josephson junction. The first capacitor includes a first capacitor end portion and a first capacitor other-end portion. The first inductor includes a first inductor end portion, and a first inductor other-end portion. The second inductor includes a second inductor end portion, and a second inductor other-end portion. The first Josephson junction includes a first Josephson junction end portion, and a first Josephson junction other-end portion. A space is surrounded with the first inductor, the second inductor, and the first Josephson junction. The third capacitor includes a third capacitor end portion, and a third capacitor other-end portion. The fourth capacitor includes a fourth capacitor end portion, and a fourth capacitor other-end portion.

Coupler and calculating device

According to one embodiment, an information processing device includes a first processing circuit and a second processing circuit. The first processing circuit is configured to update a third vector based on basic equations. Each of the basic equations is a partial derivative of an objective function with respect to either of the variables in the objective function. The second processing circuit is configured to update the element of the first vector and update the element of the second vector. The element of the first vector smaller than a first value is set to the first value. The element of the first vector greater than a second value is set to the second value.

Information processing device, non-transitory storage medium, information processing method and electronic circuit

An encoder includes a first element part and a controller. The first element part includes a first qubit, a second qubit coupleable with the first qubit, a third qubit coupleable with the second qubit, a fourth qubit coupleable with the third qubit, a fifth qubit coupleable with the fourth qubit, a sixth qubit coupleable with the fifth qubit, a seventh qubit coupleable with the sixth qubit, an eighth qubit coupleable with the seventh qubit, and a ninth qubit coupleable with the eighth qubit. The controller is configured to perform a first control. The first control includes encoding a surface code having a code distance of 3.

Encoder, calculating device, and encoding method

An electronic circuit includes a band-pass filter, and at least one first circuit. The band-pass filter includes a plurality of filter resonators. Two adjacent filter resonators included in the filter resonators are mutually couplable. The first circuit includes a first qubit and a first readout resonator. The first readout resonator is couplable with the first qubit and one of the filter resonators. A passband of the band-pass filter includes a first passband and a second passband. A magnitude of a first ripple of the first passband is not more than 1/10 of a magnitude of a second ripple of the second passband.

Electronic circuit and calculator

According to one embodiment, a calculating device includes a first memory, a second memory, a third memory, a first arithmetic module, a second arithmetic module, a first conductive line electrically connecting a first output terminal of the first memory and a first input terminal of the first arithmetic module, a second conductive line electrically connecting a second output terminal of the first memory and a first input terminal of the second arithmetic module, a third conductive line electrically connecting a first output terminal of the second memory and a second input terminal of the second arithmetic module, a fourth conductive line electrically connecting a first output terminal of the third memory and a third input terminal of the second arithmetic module, and a fifth conductive line electrically connecting a first output terminal of the second arithmetic module and a second input terminal of the first arithmetic module.

Calculating device

A calculation apparatus according to an embodiment includes matrix multiplication circuitry, time evolution circuitry, management circuitry, and output circuitry. The matrix multiplication circuitry calculates N second intermediate variables at a first time point by matrix multiplication between N (N>=2) first intermediate variables at the first time point and a preset coefficient matrix in N rows and N columns. The time evolution circuitry calculates N first variables at a second time point and N first intermediate variables at the second time point, the second time point being a time point following one sampling period after the first time point. The management circuitry increments time point from a start time point for each sampling period and controls the above circuitry to perform a process for each time point. The output circuitry outputs N first variables at a preset end time point.

Optimization problem solving calculation apparatus

A search device updates positions and momentums of a plurality of virtual particles, for each unit time from an initial time to an end time. The search device, for each unit time, calculates, for each of the particles, a position at a target time of a corresponding particle, calculates, for each of a plurality of nodes, a first accumulative value by cumulatively adding positions at the target time of two or more particles corresponding to outgoing two or more directed edges, calculates, for each of the nodes, a second accumulative value by cumulatively adding positions at the target time of two or more particles corresponding to incoming two or more directed edges, and calculates, for each of the particles, a momentum at the target time of a corresponding particle based on the first accumulative value and the second accumulative value.

Search device, search method, computer program product, search system, and arbitrage system

According to an embodiment, a calculation device includes a memory and one or more processors configured to update, for elements each associated with first and second variables, the first and second variables for each unit time, sequentially for the unit times and alternately between the first and second variables. In a calculation process for each unit time, the one or more processors are configured to: for each of the elements, update the first variable based on the second variable; update the second variable based on the first variables of the elements; when the first variable is smaller than a first value, change the first variable to a value of the first value or more and a threshold value or less; and when the first variable is greater than a second value, change the first variable to a value of the threshold value or more and the second value or less.

Calculation device, calculation method, and computer program product

According to one embodiment, a calculating device includes a processor repeating a processing procedure. The processing procedure includes a first variable update and a second variable update. The first variable update includes updating an ith entry of a first variable xby adding a first function to the ith entry of the first variable xbefore the first variable update. The second variable update includes updating the ith entry of the second variable yby adding a second function and a third function to the ith entry of the second variable ybefore the second variable update. The processor performs at least an output of at least one of the ith entry of the first variable xobtained after the repeating of the processing procedure or a function of the ith entry of the first variable xobtained after the repeating of the processing procedure.

Calculating device, calculation program, recording medium, and calculation method

According to one embodiment, a calculating device includes nonlinear oscillators, connectors, and a controller. One of the connectors connects at least two of the nonlinear oscillators. The nonlinear oscillators include first and second nonlinear oscillators. The first nonlinear oscillator includes a first circuit part and a first conductive member. The first circuit part includes first and second Josephson junctions. The second nonlinear oscillator includes a second circuit part and a second conductive member. The second circuit part includes third and fourth Josephson junctions. Numbers of the connectors connected to the first and second connectors are first and second numbers, respectively. The second number is greater than the first number. The controller performs at least a first operation of supplying a first signal to the first conductive member and supplying a second signal to the second conductive member. The second signal is different from the first signal.

According to an embodiment, an information processing system solves a combinatorial optimization problem. The information processing system includes an Ising machine and a host unit. The Ising machine is hardware configured to perform a search process for searching for the ground state of an Ising model that represents the combinatorial optimization problem. The host unit is hardware connected to the Ising machine via an interface and configured to control the Ising machine. In the search process, for each of a plurality of Ising spins, the Ising machine alternately repeats an auxiliary variable update process for updating an auxiliary variable by a main variable and a main variable update process for updating the main variable by the auxiliary variable multiple times. Prior to the search process, the host unit transmits, to the Ising machine, an initial value of the auxiliary variable corresponding to each of the plurality of Ising spins.

Information processing system

A calculation device includes a memory and one or more processors coupled to the memory and configured to alternately update, for elements each associated with first and second variables, the first and second variables, sequentially for unit times from an initial time to an end time. In an updating process for each unit time, the one or more processors are configured to: update, for each of the elements, the first variable based on the second variable; when the first variable is smaller than a first value, change the first variable to the first value and change the second variable to a third value; when the first variable is greater than a second value, change the first variable to the second value and change the second variable to the third value; and add an acceleration value calculated by a predetermined computation to the second variable.

Growing community of inventors

Kawasaki, Japan

Hayato Goto