-
公开(公告)号：EP4012789A1
公开(公告)日：2022-06-15
申请号：EP20852813.3
申请日：2020-02-28
Applicant: Japan Science and Technology Agency
Inventor： NOGUCHI, Atsushi , NAKAMURA, Yasunobu
Abstract: A quantum gate device 10 includes a first superconducting circuit 11 which resonates at a first resonance frequency, second superconducting circuit 12 which resonates at a second resonance frequency, and connector 13 which connects these circuits. The first superconducting circuit 11 includes a single first Josephson device 111, second Josephson device group 112, and first capacitor 114. The second Josephson device group 112 includes n Josephson devices connected in series 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 111. A first line 115 connects the first Josephson device 111 and the second Josephson device group 112 in a ring-like form to form a partial superconducting circuit 113, and further connects the partial superconducting circuit 113 and the first capacitor 114 in parallel. The quantum gate device 10 further includes a magnetic field applier 14 which applies a static magnetic field to the partial superconducting circuit 113, as well as an electromagnetic wave irradiator (first electromagnetic wave irradiator 151) which irradiates the first superconducting circuit 11 and/or second superconducting circuit 12 with an electromagnetic wave having a difference frequency which is equal to the difference between the first and second resonance frequencies.
-
Patent Agency Ranking
公开(公告)号：EP4250901A3
公开(公告)日：2024-04-10
申请号：EP23185781.4
申请日：2019-10-31
Applicant: Japan Science and Technology Agency
Inventor： NAKAMURA, Yasunobu , TABUCHI, Yutaka , TAMATE, Shuhei
IPC: G06N10/40 , H10N69/00 , H10N60/80 , H01L23/492
Abstract: A superconducting complex quantum computing circuit includes a circuit substrate in which a wiring pattern of a circuit element, which includes a quantum bit and an observation electrode for observing a state of the quantum bit, and a ground pattern which is at a ground potential are formed on a substrate surface, and that includes a through-electrode which connects the ground pattern formed on a first surface of the substrate surface and the ground pattern formed on a second surface, which is a surface opposite the first surface, inside the substrate; a first ground electrode that includes a first contact portion which is in contact with the ground pattern formed on the first surface of the circuit substrate, and a first non-contact portion which has a shape corresponding to a shape of the wiring pattern formed on the first surface; a second ground electrode that includes a second contact portion which is in contact with the ground pattern formed on the second surface of the circuit substrate; a control signal line that is provided with a contact spring pin at a tip, the pin being in contact with a position corresponding to the quantum bit to press the first surface of the circuit substrate against the first ground electrode or to press the second surface of the circuit substrate against the second ground electrode; 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, in which the first ground electrode is in contact with the ground pattern via a first extension portion formed by a superconductor having extensibility higher than extensibility of the ground pattern, and the second ground electrode is in contact with the ground pattern via a second extension portion formed by a superconductor having extensibility higher than the extensibility of the ground pattern.
-
公开(公告)号：EP4089751A1
公开(公告)日：2022-11-16
申请号：EP20912052.6
申请日：2020-12-28
Applicant: Japan Science and Technology Agency
Inventor： KONO, Shingo , NAKAMURA, Yasunobu
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 (1/4 + 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：EP4250901A2
公开(公告)日：2023-09-27
申请号：EP23185781.4
申请日：2019-10-31
Applicant: Japan Science and Technology Agency
Inventor： NAKAMURA, Yasunobu , TABUCHI, Yutaka , TAMATE, Shuhei
IPC: H10N69/00
Abstract: A superconducting complex quantum computing circuit includes a circuit substrate in which a wiring pattern of a circuit element, which includes a quantum bit and an observation electrode for observing a state of the quantum bit, and a ground pattern which is at a ground potential are formed on a substrate surface, and that includes a through-electrode which connects the ground pattern formed on a first surface of the substrate surface and the ground pattern formed on a second surface, which is a surface opposite the first surface, inside the substrate; a first ground electrode that includes a first contact portion which is in contact with the ground pattern formed on the first surface of the circuit substrate, and a first non-contact portion which has a shape corresponding to a shape of the wiring pattern formed on the first surface; a second ground electrode that includes a second contact portion which is in contact with the ground pattern formed on the second surface of the circuit substrate; a control signal line that is provided with a contact spring pin at a tip, the pin being in contact with a position corresponding to the quantum bit to press the first surface of the circuit substrate against the first ground electrode or to press the second surface of the circuit substrate against the second ground electrode; 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, in which the first ground electrode is in contact with the ground pattern via a first extension portion formed by a superconductor having extensibility higher than extensibility of the ground pattern, and the second ground electrode is in contact with the ground pattern via a second extension portion formed by a superconductor having extensibility higher than the extensibility of the ground pattern.
-
5.发明公开
公开(公告)号：EP4408149A1
公开(公告)日：2024-07-31
申请号：EP22872712.9
申请日：2022-09-07
Applicant: Japan Science and Technology Agency
Inventor： NOGUCHI, Atsushi , OSADA, Alto , NAKAMURA, Yasunobu
Abstract: Electron trap device 1 comprises a cryogenic apparatus 40, a superconducting circuit 10 and a heat bath 60. The superconducting circuit 10 and the heat bath 60 are placed within the cryogenic apparatus 40. This allows the superconducting circuit 10 to operate and the heat bath 60 to be maintained at a constant low temperature, e.g., about 20 mK. The superconducting circuit 10 comprises a cooling resonator 20, a microwave resonator 22 and an electron trap region 50. The superconducting circuit 10 comprises a microstructure in which the opposing electrodes are arranged in a position that is linear symmetrical to the center line through the electron trap region and surrounded by a superconductor, such that the electron trap region 50 comprises a plurality of opposing electrodes.
-
公开(公告)号：EP3866213A1
公开(公告)日：2021-08-18
申请号：EP19870463.7
申请日：2019-10-31
Applicant: Japan Science and Technology Agency
Inventor： NAKAMURA, Yasunobu , TABUCHI, Yutaka , TAMATE, Shuhei
Abstract: A superconducting complex quantum computing circuit includes a circuit substrate in which a wiring pattern of a circuit element, which includes a quantum bit and an observation electrode for observing a state of the quantum bit, and a ground pattern which is at a ground potential are formed on a substrate surface, and that includes a through-electrode which connects the ground pattern formed on a first surface of the substrate surface and the ground pattern formed on a second surface, which is a surface opposite the first surface, inside the substrate; a first ground electrode that includes a first contact portion which is in contact with the ground pattern formed on the first surface of the circuit substrate, and a first non-contact portion which has a shape corresponding to a shape of the wiring pattern formed on the first surface; a second ground electrode that includes a second contact portion which is in contact with the ground pattern formed on the second surface of the circuit substrate; a control signal line that is provided with a contact spring pin at a tip, the pin being in contact with a position corresponding to the quantum bit to press the first surface of the circuit substrate against the first ground electrode or to press the second surface of the circuit substrate against the second ground electrode; 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, in which the first ground electrode is in contact with the ground pattern via a first extension portion formed by a superconductor having extensibility higher than extensibility of the ground pattern, and the second ground electrode is in contact with the ground pattern via a second extension portion formed by a superconductor having extensibility higher than the extensibility of the ground pattern.
-
-
-
-
-
Search Results
6
records
(took 0.013 seconds)
