公开(公告)号：US11949439B2

公开(公告)日：2024-04-02

申请号：US17552580

申请日：2021-12-16

Applicant: International Business Machines Corporation

Inventor： Timothy Phung ,  Devin Underwood ,  Jiri Stehlik ,  David Zajac

IPC: H05K9/00 ,  G06N10/40 ,  H04B1/00 ,  H04B1/40

CPC classification number: H04B1/0096 ,  G06N10/40 ,  H04B1/0028

Abstract: Systems and techniques that facilitate mitigation of baseband pulse distortion via radiofrequency-to-baseband conversion are provided. In various embodiments, a system can comprise a qubit. In various aspects, the system can further comprise a signal generator that can produce a radiofrequency signal. In various instances, the system can further comprise a signal converter coupled between the qubit and the signal generator. In various cases, the signal converter can convert the radiofrequency signal into a baseband signal. In various aspects, such radiofrequency-to-baseband conversion can reduce a dispersion-induced distortion associated with driving the qubit.

公开(公告)号：US20230359919A1

公开(公告)日：2023-11-09

申请号：US17819535

申请日：2022-08-12

Applicant: International Business Machines Corporation

Inventor： Timothy Phung ,  Muir Kumph

IPC: G06N10/40

CPC classification number: G06N10/40

Abstract: One or more systems, devices and/or methods of use herein relate to modular quantum devices. According to an embodiment, a device can comprise a first module comprising a first qubit coupled to a first transmission line resonator, and a second module comprising a second qubit coupled to a second transmission line resonator, wherein the first module is embodied on a first chip and wherein the second module is embodied on a second chip.

公开(公告)号：US12047063B2

公开(公告)日：2024-07-23

申请号：US18047792

申请日：2022-10-19

Applicant: International Business Machines Corporation

Inventor： Timothy Phung

IPC: H03K17/92 ,  G06F30/394 ,  G06N10/00 ,  H10N69/00

CPC classification number: H03K17/92 ,  G06F30/394 ,  G06N10/00 ,  H10N69/00

Abstract: Techniques for designing, creating, and utilizing a current biased tunable qubit are presented. A qubit device can comprise a first Josephson junction (JJ) located along a first current path of the device, and a second JJ and third JJ coupled in series along a second current path in parallel with the first current path, wherein the second and third JJs facilitate controlling frequency of the device. The first JJ can be larger in area than each of the second and third JJs, wherein a current splitting ratio between the first current path and second current path can be increased thereby. The device can comprise a capacitor with a first terminal associated with the second and third JJs, and a second terminal associated with ground. Alternatively, a high kinetic inductance wire can be used in the first current path, instead of the JJ.

公开(公告)号：US11545974B2

公开(公告)日：2023-01-03

申请号：US17031369

申请日：2020-09-24

Applicant: International Business Machines Corporation

Inventor： Timothy Phung

IPC: G06N10/00 ,  H03K17/92 ,  G06F30/394 ,  H01L27/18

Abstract: Techniques for designing, creating, and utilizing a current biased tunable qubit are presented. A qubit device can comprise a first Josephson junction (JJ) located along a first current path of the device, and a second JJ and third JJ coupled in series along a second current path in parallel with the first current path, wherein the second and third JJs facilitate controlling frequency of the device. The first JJ can be larger in area than each of the second and third JJs, wherein a current splitting ratio between the first current path and second current path can be increased thereby. The device can comprise a capacitor with a first terminal associated with the second and third JJs, and a second terminal associated with ground. Alternatively, a high kinetic inductance wire can be used in the first current path, instead of the JJ.

公开(公告)号：US11411158B2

公开(公告)日：2022-08-09

申请号：US17130376

申请日：2020-12-22

Applicant: International Business Machines Corporation

Inventor： Timothy Phung ,  David Abraham

IPC: H01L39/02 ,  G06N10/00 ,  H01L39/04 ,  H01L39/24 ,  H01L39/22

Abstract: Techniques for creating an offset embedded ground plane cutout for a qubit device to facilitate frequency tuning of the qubit device are presented. A qubit device can comprise a first substrate and second substrate in a flip-chip assembly. The qubit chip assembly can comprise a qubit component fabricated on the first substrate. The qubit component can comprise a Josephson junction (JJ) circuit that can be offset from a center point of the qubit component. The qubit chip assembly can comprise an embedded ground plane situated on a surface of the qubit chip assembly. A cutout section can be formed in the ground plane and positioned over the JJ circuit. The cutout section can enable access of an optical signal or magnetic flux to the JJ circuit. A frequency of the qubit component can be tuned based on application of the optical signal or magnetic flux to the JJ circuit.

公开(公告)号：US10916282B2

公开(公告)日：2021-02-09

申请号：US16447753

申请日：2019-06-20

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Timothy Phung ,  Chirag Garg

IPC: G11C11/00 ,  G11C11/16 ,  H01F10/32 ,  H01L43/04 ,  H03K19/20 ,  H03K19/18 ,  H01L43/10 ,  H01L27/22 ,  G11C11/18 ,  H01L43/06

Abstract: A three-terminal device is disclosed having a magnetic tunnel junction (MTJ) and a spin orbit torque (SOT) generating layer. The MTJ has a first magnetic layer, a tunnel barrier layer underlying the first magnetic layer, and a second magnetic layer underlying the tunnel barrier, wherein the SOT generating layer is directly underlying the second magnetic layer. The second magnetic layer has a shape that is non-symmetrical, such that an average magnetization of a remnant state associated with the second magnetic layer has an in-plane component that is orthogonal to a current direction in the SOT generating layer.

公开(公告)号：US20250131304A1

公开(公告)日：2025-04-24

申请号：US18491583

申请日：2023-10-20

Applicant: International Business Machines Corporation

Inventor： Abram L Falk ,  Jason S. Orcutt ,  Timothy Phung ,  Chi Xiong

IPC: G06N10/40

Abstract: Techniques are provided for performing an optically heralded entanglement process to entangle states of a first data quantum bit and a second data quantum bit into an entangled state of computational basis states comprising a ground state and a first excited state. An optically heralded entanglement process comprises performing a first optically heralded entanglement process to determine whether the entangled state of the first data quantum bit and the second data quantum bit excludes a state in which both the first data quantum bit and the second data quantum bit can be in the ground state, and performing a second optically heralded entanglement process to determine whether the entangled state of the first data quantum bit and the second data quantum bit excludes a state in which both the first data quantum bit and the second data quantum bit can be in the first excited state.

公开(公告)号：US12108689B2

公开(公告)日：2024-10-01

申请号：US17200487

申请日：2021-03-12

Applicant: International Business Machines Corporation

Inventor： Timothy Phung ,  Charles Thomas Rettner ,  Harry Jonathon Mamin ,  Vivekananda P. Adiga ,  Russell A. Budd

IPC: H10N60/12 ,  H01L49/02 ,  H10N60/01 ,  H10N69/00

CPC classification number: H10N60/12 ,  H01L28/10 ,  H01L28/40 ,  H10N60/0912 ,  H10N69/00

Abstract: Systems and techniques that facilitate trimmable inductors for qubit frequency tuning are provided. In various embodiments, a device can comprise a Josephson junction. In various aspects, the Josephson junction can be shunted by a capacitor, and a trimmable inductor can couple the Josephson junction to a pad of the capacitor. In various cases, the trimmable inductor can comprise a first conductive path that includes a severable and/or weldable superconducting bridge and a second conductive path that is in parallel with the first conductive path. In various aspects, severing and/or welding the severable and/or weldable superconducting bridge can controllably change an inductance of the trimmable inductor, which can commensurately change a resonant frequency of a qubit formed by the Josephson junction and the capacitor.

公开(公告)号：US11714142B2

公开(公告)日：2023-08-01

申请号：US17119519

申请日：2020-12-11

Applicant: International Business Machines Corporation

Inventor： Timothy Phung ,  Jiri Stehlik ,  Devin Underwood

IPC: G01R33/58 ,  G01R33/035 ,  H01P1/04 ,  H03H7/01

CPC classification number: G01R33/0358 ,  H01P1/047 ,  H03H7/0138 ,  H03H7/0153

Abstract: Techniques for creating a low pass filter associated with a flux line are presented. A qubit device can comprise a first substrate and second substrate. A low pass filter, comprising at least one inductor and at least one capacitor can be formed, wherein respective components of or associated with the low pass filter can be formed on the first or second substrates, and wherein one or more bump bonds can extend between the substrates to connect respective components that are on respective substrates. The filter can receive an input signal via an input line and filter the signal to produce a filtered signal as output to a flux line that is in proximity to a coupler with SQUID loop and one or more flux-tunable qubits that are formed on one of the substrates. The filter can reduce electrical noise and Purcell decay associated with the flux line.

公开(公告)号：US20230170889A1

公开(公告)日：2023-06-01

申请号：US17538013

申请日：2021-11-30

Applicant: International Business Machines Corporation

Inventor： Devin Underwood ,  Jiri Stehlik ,  David James Frank ,  Timothy Phung ,  David Zajac

IPC: H03K5/1252 ,  G06N10/40

CPC classification number: H03K5/1252 ,  G06N10/40

Abstract: One or more systems, devices, methods of use and/or methods of fabrication provided herein relate to a quantum computing device that can operated to have 1st order insensitivity to flux noise. According to one embodiment, a device comprises a flux tunable qubit capacitively coupled to a flux tunable bus. According to another embodiment, a device comprises a flux tunable qubit capacitively coupled to a flux tunable bus, wherein the flux tunable bus is capacitively coupled a fixed frequency qubit.