公开(公告)号：US20230401475A1

公开(公告)日：2023-12-14

申请号：US17835511

申请日：2022-06-08

Applicant: International Business Machines Corporation

Inventor： Aaron Finck ,  David C. Mckay ,  Jiri Stehlik ,  John Blair

IPC: G06N10/40 ,  G06N10/20 ,  H01L39/22

CPC classification number: G06N10/40 ,  G06N10/20 ,  H01L39/228 ,  H01L39/221

Abstract: A device comprises first and second superconducting quantum bits, and a multimode coupler circuit coupled between the first and second superconducting quantum bits. The multimode coupler circuit comprises a first mode and a second mode, and is configured to operate in one of a first state and a second state, in response to a flux tuning control signal. In the first state, the first superconducting quantum bit is exchange coupled to the first mode, and the second superconducting quantum bit is exchange coupled to the second mode, to suppress interaction between the first and second superconducting quantum bits. In the second state, the first and second superconducting quantum bits are exchange coupled to both the first and second modes, to enable an interaction between the first and second superconducting quantum bits and perform an entanglement gate operation.

公开(公告)号：US11751489B2

公开(公告)日：2023-09-05

申请号：US17541364

申请日：2021-12-03

Applicant: International Business Machines Corporation

Inventor： Aaron Finck

IPC: G06N10/20 ,  H10N60/12 ,  H03K3/38

CPC classification number: H10N60/12 ,  G06N10/20 ,  H03K3/38

Abstract: Techniques regarding a quantum entangling gate between multi-mode superconducting qubits are provided. For example, one or more embodiments described herein can comprise an apparatus, which can comprise a first multi-mode superconducting qubit coupled to a second multi-mode superconducting qubit via a transmon qubit.

公开(公告)号：US20230179205A1

公开(公告)日：2023-06-08

申请号：US17545989

申请日：2021-12-08

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Aaron Finck

IPC: H03K17/92 ,  G06N10/40

CPC classification number: H03K17/92 ,  G06N10/40 ,  H01L39/223

Abstract: A qubit structure includes a first fluxonium qubit having a first Josephson Junction (JJ) in parallel with a first capacitor and a first superconducting inductor. A second fluxonium qubit includes a second JJ in parallel with a second capacitor and a second superconducting inductor, coupled in series with the first fluxonium qubit. A third capacitor is coupled in parallel to the series first and second fluxonium qubits.

公开(公告)号：US11658660B1

公开(公告)日：2023-05-23

申请号：US17848903

申请日：2022-06-24

Applicant: International Business Machines Corporation

Inventor： Aaron Finck ,  John Blair ,  George Andrew Keefe ,  Muir Kumph

IPC: H03K17/92

CPC classification number: H03K17/92 ,  H10N60/12

Abstract: A device comprises first and second qubits, and a qubit coupler coupled between the first and second qubits. The second qubit comprises first and second modes with the first mode configured to store data. The qubit coupler comprises first and second modes, and operates in a first state or second state. In the first state, the first qubit is exchange coupled to the first mode of the qubit coupler, and the second mode of the second qubit is exchange coupled to the second mode of the qubit coupler, to suppress interaction between the first and second qubits. In the second state, the first qubit and the first mode of the second qubit are exchange coupled to both the first and second modes the qubit coupler, to enable interaction between the first and second qubits for an entanglement gate operation in response to a control signal applied to the qubit coupler.

公开(公告)号：US20240403681A1

公开(公告)日：2024-12-05

申请号：US18161365

申请日：2023-01-30

Applicant: International Business Machines Corporation

Inventor： Aaron Finck

IPC: G06N10/40 ,  H03K17/92

Abstract: One or more electronic systems, electronic structures and/or methods provided herein relate to quantum state measurement while suppressing measurement-induced state transition in a superconducting qubit. An electronic system can comprise a superconducting qubit coupled to a tunable coupler qubit (TCQ), and a microwave drive port coupled to the TCQ. A resonator can be coupled between the TCQ and the microwave drive port. The resonator can be coupled to the microwave drive port by direct capacitive coupling or inductive coupling. The superconducting qubit can be coupled to the TCQ by a pair of parallelly-arranged coupling capacitors having equal capacitance to one another, or the resonator can be coupled to the TCQ by a pair of parallelly-arranged coupling capacitors having equal capacitance to one another.

公开(公告)号：US12089511B2

公开(公告)日：2024-09-10

申请号：US18165479

申请日：2023-02-07

Applicant: International Business Machines Corporation

Inventor： Aaron Finck ,  John Blair ,  April Carniol ,  Oliver Dial ,  Muir Kumph

IPC: H01L39/22 ,  G06N10/00 ,  G06N10/40 ,  G06N10/70 ,  H10N60/12 ,  H10N60/80 ,  H10N69/00

CPC classification number: H10N69/00 ,  G06N10/00 ,  G06N10/40 ,  G06N10/70 ,  H10N60/12 ,  H10N60/805

Abstract: Devices and/or computer-implemented methods to facilitate ZZ cancellation between qubits are provided. According to an embodiment, a device can comprise a coupler device that operates in a first oscillating mode and a second oscillating mode. The device can further comprise a first superconducting qubit coupled to the coupler device based on a first oscillating mode structure corresponding to the first oscillating mode and based on a second oscillating mode structure corresponding to the second oscillating mode. The device can further comprise a second superconducting qubit coupled to the coupler device based on the first oscillating mode structure and the second oscillating mode structure.

公开(公告)号：US20240273391A1

公开(公告)日：2024-08-15

申请号：US18168181

申请日：2023-02-13

Applicant: International Business Machines Corporation

Inventor： Aaron Finck

IPC: G06N10/40 ,  G06N10/20 ,  H10N60/12 ,  H10N60/80

CPC classification number: G06N10/40 ,  G06N10/20 ,  H10N60/12 ,  H10N60/805

Abstract: An electronic structure can include a first superconducting quantum interference device (SQUID) coupled between a first pad and a second pad of a first tunable coupler qubit (TCQ) having a first qubit, and a first Josephson Junction (JJ) coupled between a second pad and a third pad of the first TCQ. The electronic structure can include a second SQUID coupled between a first pad and a second pad of a second TCQ having a second qubit, and a second JJ coupled between the second pad and a third pad of the second TCQ. The second pad of the first TCQ can be coupled to the second pad of the second TCQ. The first TCQ can be coupled to a first driveline, and the second TCQ can be coupled to a second driveline.

公开(公告)号：US20240169232A1

公开(公告)日：2024-05-23

申请号：US18056829

申请日：2022-11-18

Applicant: International Business Machines Corporation

Inventor： Aaron Finck ,  Sarunya Bangsaruntip ,  Cihan Kurter ,  John Blair ,  George Andrew Keefe

IPC: G06N10/20 ,  G06N10/40 ,  H03K17/92

CPC classification number: G06N10/20 ,  G06N10/40 ,  H03K17/92

Abstract: One or more systems, devices, or methods of use provided herein relate to a process of long-range coupling qubits in a quantum computing device with energy loss protection. A system can comprise a first transmon coupler capable of selectively coupling a first tunable coupler qubit to a first fluxonium qubit; a second transmon coupler capable of selectively coupling a second tunable coupler qubit to a second fluxonium qubit. Additionally, in one or more embodiments, the system can include a long-range coupler capable of selectively coupling the first fluxonium qubit to the second fluxonium qubit. The first transmon coupler can be coupled to a first B mode of the first tunable coupler qubit, and the second transmon coupler can be coupled to a second B mode of the second tunable coupler qubit.

公开(公告)号：US20240138270A1

公开(公告)日：2024-04-25

申请号：US18165479

申请日：2023-02-07

Applicant: International Business Machines Corporation

Inventor： Aaron Finck ,  John Blair ,  April Carniol ,  Oliver Dial ,  Muir Kumph

IPC: H10N69/00 ,  G06N10/40 ,  G06N10/70 ,  H10N60/12 ,  H10N60/80

CPC classification number: H10N69/00 ,  G06N10/40 ,  G06N10/70 ,  H10N60/12 ,  H10N60/805

Abstract: Devices and/or computer-implemented methods to facilitate ZZ cancellation between qubits are provided. According to an embodiment, a device can comprise a coupler device that operates in a first oscillating mode and a second oscillating mode. The device can further comprise a first superconducting qubit coupled to the coupler device based on a first oscillating mode structure corresponding to the first oscillating mode and based on a second oscillating mode structure corresponding to the second oscillating mode. The device can further comprise a second superconducting qubit coupled to the coupler device based on the first oscillating mode structure and the second oscillating mode structure.

公开(公告)号：US20230401476A1

公开(公告)日：2023-12-14

申请号：US17836268

申请日：2022-06-09

Applicant: International Business Machines Corporation

Inventor： Aaron Finck ,  Cihan Kurter ,  Sarunya Bangsaruntip ,  Harry Jonathon Mamin ,  Charles Thomas Rettner ,  John Blair ,  George Andrew Keefe

IPC: G06N10/40 ,  G06N10/20 ,  H01L39/02 ,  H01L39/10

CPC classification number: G06N10/40 ,  G06N10/20 ,  H01L39/025 ,  H01L39/10

Abstract: A device comprises a first superconducting quantum bit, a second superconducting quantum bit, and a coupler circuit. The first superconducting quantum bit comprises a superconducting tunnel junction and a shunt inductor which form a first superconducting loop. The second superconducting quantum bit comprises a superconducting tunnel junction and a shunt inductor which form a second superconducting loop. The coupler circuit is coupled between the first and second superconducting quantum bits. The coupler circuit is configured to implement an entanglement gate operation between the first and second superconducting quantum bits through exchange interactions between the coupler circuit and the first superconducting quantum bit and the second superconducting quantum bit, when the coupler circuit is driven by a control signal. The coupler circuit is configured to suppress interaction between the first superconducting quantum bit and the second superconducting quantum bit, when the coupler circuit is not driven by the control signal.