-
公开(公告)号：US20230189666A1
公开(公告)日：2023-06-15
申请号：US17926073
申请日：2021-04-08
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Atsushi NOGUCHI , Alto OSADA , Yasunobu NAKAMURA
Abstract: A quantum gate device includes a first superconducting circuit which includes at least one of Josephson devices in an annular circuit including a superconducting wire and resonates at a first resonance frequency, a second superconducting circuit which includes at least one of Josephson devices in an annular circuit including a superconducting wire and resonates at a second resonance frequency, a connection unit which includes a capacitor and a superconducting wire provided at each electrode of the capacitor and connects the first and second circuits, a magnetic field application means applying a magnetic field to one or both of the first and second circuits, a quantum gate control electromagnetic wave irradiation unit irradiating one of the first and second circuits with a control electromagnetic wave, and an unnecessary transition suppression electromagnetic wave irradiation unit irradiating one of the first and second circuits with an unnecessary interaction suppression electromagnetic wave.
-
公开(公告)号：US20230380303A1
公开(公告)日：2023-11-23
申请号：US18224685
申请日：2023-07-21
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Yasunobu NAKAMURA , Yutaka TABUCHI , Shuhei TAMATE
CPC classification number: H10N69/00 , G06N10/00 , H10N60/12 , H10N60/805
Abstract: A superconducting complex quantum computing circuit includes a circuit substrate in which a wiring pattern of a circuit element including quantum bits and measurement electrodes, and ground patterns are formed, and through-electrodes connecting the ground pattern formed on a first surface of the substrate surface and the ground pattern formed on a second surface; a first ground electrode including a first contact portion in contact with the ground patterns, and a first non-contact portion having a shape corresponding to a shape of the wiring pattern; a second ground electrode including a second contact portion in contact with the ground pattern; a control signal line provided with a contact spring pin at a tip; and a pressing member that presses the first ground electrode against the first surface of the circuit substrate or presses the second ground electrode against the second surface of the circuit substrate.
-
公开(公告)号：US20220021372A1
公开(公告)日：2022-01-20
申请号：US17295577
申请日：2019-11-22
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Yasunobu NAKAMURA , Shingo KONO , Kazuki KOSHINO
Abstract: This nonlinear microwave filter is provided with quantum bits that are formed on a circuit board in which target quantum bits are formed which are quantum bits controlled in a superconducting quantum circuit, and that are coupled to a control waveguide to which the target quantum bits are coupled, wherein the distance to a waveguide end in the control waveguide is within a predetermined range from semi integer times the resonant wavelength, the quantum bits have a resonant frequency in which the difference from the resonant frequency of the target quantum bits is within a predetermined range, and the coupling to the control waveguide is stronger by a predetermined value than the coupling between the target quantum bits and the control waveguide.
-
Patent Agency Ranking
公开(公告)号：US20210343785A1
公开(公告)日：2021-11-04
申请号：US17283037
申请日：2019-10-31
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Yasunobu NAKAMURA , Yutak TABUCHI , Shuhei TAMATE
Abstract: A superconducting complex quantum computing circuit includes a circuit substrate in which a wiring pattern of a circuit element including quantum bits and measurement electrodes, and ground patterns are formed, and through-electrodes connecting the ground pattern formed on a first surface of the substrate surface and the ground pattern formed on a second surface; a first ground electrode including a first contact portion in contact with the ground patterns, and a first non-contact portion having a shape corresponding to a shape of the wiring pattern; a second ground electrode including a second contact portion in contact with the ground pattern; a control signal line provided with a contact spring pin at a tip; and a pressing member that presses the first ground electrode against the first surface of the circuit substrate or presses the second ground electrode against the second surface of the circuit substrate.
-
公开(公告)号：US20240386303A1
公开(公告)日：2024-11-21
申请号：US18557838
申请日：2022-02-18
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Yasunobu NAKAMURA , Yutaka TABUCHI , Shuhei TAMATE
Abstract: A quantum computation controller according to one embodiment has a control signal generator, an observation unit that receives an observation signal indicating the state of each qubit and a qubit module. The qubit module has a qubit substrate on which a plurality of qubits are arranged, a control circuit, an observation circuit, and a signal processing circuit. The qubits are grouped into a plurality of groups. The control signal generator generates a control signal for performing a first operation, a control signal for performing a second operation and an instruction signal. The control circuit splits the control signal into groups and controls the sending of the control signal. The observation circuit observes the state of each qubit on which the first operation or the second operation has been performed. The signal processing circuit sends the observation signal of each qubit to the observation circuit.
-
6.发明公开公开(公告)号：US20240160984A1
公开(公告)日：2024-05-16
申请号：US18463815
申请日：2023-09-08
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Yasunobu NAKAMURA , Yoshiki SUNADA
IPC: G06N10/40
CPC classification number: G06N10/40
Abstract: A quantum entanglement generator comprises two superconducting qubit elements, each having three electrodes, where n is an integer greater than or equal to, a coupling resonator disposed between adjacent superconducting qubit elements and a waveguide capacitively coupled to each of the superconducting qubit elements and to each other. The coupling resonator generates quantum entanglement between the adjacent superconducting qubit elements by acting a two-qubit gate between the adjacent superconducting qubit elements. The superconducting qubit elements emit the quantum entanglement as a propagating microwave photon into the waveguide, thereby generating a two-dimensional cluster state.
-
公开(公告)号：US20220376797A1
公开(公告)日：2022-11-24
申请号：US17790819
申请日：2020-12-28
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Shingo KONO , Yasunobu NAKAMURA
Abstract: A microwave photon control device includes a first qubit and a second qubit that are connected in parallel to a waveguide through which microwave photons propagate, and a direct coupling between the first qubit and the second qubit. An interval between the first qubit and the second qubit is (¼+n/2) times as long as a wavelength of microwave photons (where n is an integer equal to or larger than 0). A quantum entangled state is formed between the first qubit and the second qubit. The direct coupling cancels out a coupling via the waveguide between the first qubit and the second qubit. By a relaxation rate of the first qubit and the second qubit, and a phase of the quantum entangled state being controlled, the microwave photon control device operates while switching between a first operation mode, a second operation mode, and a third operation mode.
-
公开(公告)号：US20220269968A1
公开(公告)日：2022-08-25
申请号：US17629718
申请日：2020-02-28
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Atsushi NOGUCHI , Yasunobu NAKAMURA
Abstract: A quantum gate device includes a first superconducting circuit which resonates at a first resonance frequency, second superconducting circuit which resonates at a second resonance frequency, and connector which connects these circuits. The first superconducting circuit includes a single first Josephson device, second Josephson device group, and first capacitor. The second Josephson device group includes n Josephson devices connected by a line made of a superconductor. The Josephson energy possessed by each of the n Josephson devices is greater than n times that of the first Josephson device. The quantum gate device further includes a magnetic field applier which applies a static magnetic field to the partial superconducting circuit, and an electromagnetic wave irradiator (first electromagnetic wave irradiator) which irradiates the first superconducting circuit and/or second superconducting circuit with an electromagnetic wave having a difference frequency which is equal to the difference between the first and second resonance frequencies.
-
-
-
-
-
-
-
Search Results
8
records
(took 0.018 seconds)
