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1. 发明申请

US20200091396A1 ZZZ COUPLER FOR SUPERCONDUCTING QUBITS 审中-公开
公开(公告)号：US20200091396A1
公开(公告)日：2020-03-19
申请号：US16690190
申请日：2019-11-21
申请人： DAVID GEORGE FERGUSON , ANTHONY JOSEPH PRZYBYSZ , JOEL D. STRAND
发明人： DAVID GEORGE FERGUSON , ANTHONY JOSEPH PRZYBYSZ , JOEL D. STRAND
IPC分类号： H01L39/02 , H03K19/195 , G06N10/00
摘要： Systems and methods are provided for a ZZZ coupler. A first tunable coupler is coupled to the first qubit and tunable via a first control signal. A second tunable coupler is coupled to the first tunable coupler to direct a flux of the first qubit into a tuning loop of the second tunable coupler, such that when a first coupling strength associated with the first tunable coupler is non-zero, a second coupling strength, associated with the second tunable coupler, is a function of a second control signal applied to the second tunable coupler and a state of the first qubit. The second qubit and the third qubit are coupled to one another through the second tunable coupler, such that, when the second coupling strength is non-zero it is energetically favorable for the states of the first and second qubits to assume a specific relationship with respect to the Z-axis.

2. 发明申请

US20210327624A1 SUPERCONDUCTING CURRENT CONTROL SYSTEM 有权
公开(公告)号：US20210327624A1
公开(公告)日：2021-10-21
申请号：US16849595
申请日：2020-04-15
申请人： JOEL D. STRAND
发明人： JOEL D. STRAND
IPC分类号： H01F6/00 , H01L27/18 , H01L39/02 , H01L39/22 , G06N10/00
摘要： One example includes a superconducting current control system. The system includes an inductive coupler comprising a load inductor and a control inductor. The inductive coupler can be configured to inductively provide a control current from the control inductor to a superconducting circuit device based on a load current being provided through the load inductor. The system also includes a current control element comprising a superconducting quantum interference device (SQUID) array comprising a plurality of SQUIDs. The current control element can be coupled to the inductive coupler to control an amplitude of the load current through the load inductor, and thus to control an amplitude of the control current to the superconducting circuit device.

3. 发明申请

US20210257532A1 SUPERCONDUCTING BUMP BOND ELECTRICAL CHARACTERIZATION 有权
公开(公告)号：US20210257532A1
公开(公告)日：2021-08-19
申请号：US17168443
申请日：2021-02-05
申请人： AURELIUS L. GRANINGER , JOEL D. STRAND , MICAH JOHN ATMAN STOUTIMORE , ZACHARY KYLE KEANE , JEFFREY DAVID HARTMAN , JUSTIN C. HACKLEY
发明人： AURELIUS L. GRANINGER , JOEL D. STRAND , MICAH JOHN ATMAN STOUTIMORE , ZACHARY KYLE KEANE , JEFFREY DAVID HARTMAN , JUSTIN C. HACKLEY
IPC分类号： H01L39/02 , G01R31/28 , H01L21/66 , H01L23/00 , H01L25/065 , H01L27/18 , H01L39/08 , H01L39/10 , H01L39/12 , H01L39/06 , H01L39/22
摘要： Test structures and methods for superconducting bump bond electrical characterization are used to verify the superconductivity of bump bonds that electrically connect two superconducting integrated circuit chips fabricated using a flip-chip process, and can also ascertain the self-inductance of bump bond(s) between chips. The structures and methods leverage a behavioral property of superconducting DC SQUIDs to modulate a critical current upon injection of magnetic flux in the SQUID loop, which behavior is not present when the SQUID is not superconducting, by including bump bond(s) within the loop, which loop is split among chips. The sensitivity of the bump bond superconductivity verification is therefore effectively perfect, independent of any multi-milliohm noise floor that may exist in measurement equipment.

4. 发明申请

US20160079968A1 TUNABLE TRANSMON CIRCUIT ASSEMBLY 有权
标题翻译：可控转移电路组件
公开(公告)号：US20160079968A1
公开(公告)日：2016-03-17
申请号：US14485129
申请日：2014-09-12
申请人： JOEL D. STRAND , Aaron A. Pesetski
发明人： JOEL D. STRAND , Aaron A. Pesetski
IPC分类号： H03K3/38 , H03K3/012 , H01L39/24
CPC分类号： H03K3/38 , B82Y10/00 , G06N99/002 , H01L39/2493 , H03K3/012
摘要： Systems and methods are provided for a tunable transmon qubit. The qubit includes a first Josephson junction on a first path between a transmission line and a circuit ground and second and third Josephson junctions arranged in parallel with one another on a second path between the transmission line and the circuit ground to form a direct current superconducting quantum interference device (DC SQUID). The DC SQUID is in parallel with the first Josephson junction. A capacitor is arranged in parallel with the first Josephson junction and the DC SQUID on a third path between the transmission line and the circuit ground as to form, in combination with the first path, an outer loop of the tunable transmon qubit. A bias circuit is configured to provide a constant bias flux to one of the DC SQUID and the outer loop of the tunable transmon qubit.
摘要翻译：为可调谐的超音速量子位提供了系统和方法。量子比特包括在传输线和电路地之间的第一路径上的第一约瑟夫逊结，以及在传输线和电路接地之间的第二路径上彼此并联布置的第二和第三约瑟夫逊结，以形成直流超导量子干扰设备（DC SQUID）。 DC SQUID与第一个约瑟夫逊结并联。在传输线和电路接地之间的第三路径上，与第一约瑟夫逊结和DC SQUID并联地布置电容器，以便与第一路径组合形成可调谐的超音速量子位的外部环路。偏置电路被配置为向可调谐跨量子位的DC SQUID和外部环路之一提供恒定的偏置通量。

5. 发明申请

US20230019017A1 SUPERCONDUCTING AC SWITCH SYSTEM 有权
公开(公告)号：US20230019017A1
公开(公告)日：2023-01-19
申请号：US17375210
申请日：2021-07-14
申请人： AURELIUS L. GRANINGER , AARON A. PESETSKI , JOEL D. STRAND
发明人： AURELIUS L. GRANINGER , AARON A. PESETSKI , JOEL D. STRAND
IPC分类号： H03K17/92 , H01F7/06
摘要： A superconducting AC switch system includes a switch network configuration comprising a Josephson junction (JJ) coupled to a transmission line having a transmission line impedance, and a magnetic field generator that is configured to switch from inducing a magnetic field in a plane of the JJ, and providing no magnetic field in the plane of the JJ. An AC input signal applied at an input of the switch network configuration is passed through to an output of the switch network configuration in a first magnetic state, and substantially reflected back to the input of the switch network configuration in a second magnetic state. The first magnetic state is one of inducing and not inducing a magnetic field in a plane of the JJ, and the second magnetic state is the other of inducing and not inducing a magnetic field in a plane of the JJ.

6. 发明申请

US20200220064A1 SUPERCONDUCTING BUMP BOND ELECTRICAL CHARACTERIZATION 审中-公开
公开(公告)号：US20200220064A1
公开(公告)日：2020-07-09
申请号：US16241661
申请日：2019-01-07
申请人： AURELIUS L. GRANINGER , JOEL D. STRAND , MICAH JOHN ATMAN STOUTIMORE , ZACHARY KYLE KEANE , JEFFREY DAVID HARTMAN , JUSTIN C. HACKLEY
发明人： AURELIUS L. GRANINGER , JOEL D. STRAND , MICAH JOHN ATMAN STOUTIMORE , ZACHARY KYLE KEANE , JEFFREY DAVID HARTMAN , JUSTIN C. HACKLEY
IPC分类号： H01L39/02 , H01L25/065 , H01L23/00 , H01L27/18 , H01L21/66 , G01R31/28
摘要： Test structures and methods for superconducting bump bond electrical characterization are used to verify the superconductivity of bump bonds that electrically connect two superconducting integrated circuit chips fabricated using a flip-chip process, and can also ascertain the self-inductance of bump bond(s) between chips. The structures and methods leverage a behavioral property of superconducting DC SQUIDs to modulate a critical current upon injection of magnetic flux in the SQUID loop, which behavior is not present when the SQUID is not superconducting, by including bump bond(s) within the loop, which loop is split among chips. The sensitivity of the bump bond superconductivity verification is therefore effectively perfect, independent of any multi-milliohm noise floor that may exist in measurement equipment.

7. 发明申请

US20180342663A1 ZZZ COUPLER FOR SUPERCONDUCTING QUBITS 审中-公开
公开(公告)号：US20180342663A1
公开(公告)日：2018-11-29
申请号：US16037539
申请日：2018-07-17
申请人： DAVID GEORGE FERGUSON , ANTHONY JOSEPH PRZYBYSZ , JOEL D. STRAND
发明人： DAVID GEORGE FERGUSON , ANTHONY JOSEPH PRZYBYSZ , JOEL D. STRAND
IPC分类号： H01L39/02 , G06N99/00 , H03K19/195
摘要： Systems and methods are provided for a ZZZ coupler. A first tunable coupler is coupled to the first qubit and tunable via a first control signal. A second tunable coupler is coupled to the first tunable coupler to direct a flux of the first qubit into a tuning loop of the second tunable coupler, such that when a first coupling strength associated with the first tunable coupler is non-zero, a second coupling strength, associated with the second tunable coupler, is a function of a second control signal applied to the second tunable coupler and a state of the first qubit. The second qubit and the third qubit are coupled to one another through the second tunable coupler, such that, when the second coupling strength is non-zero it is energetically favorable for the states of the first and second qubits to assume a specific relationship with respect to the Z-axis.

8. 发明公开

US20240195414A1 SUPERCONDUCTING CURRENT CONTROL SYSTEM 审中-公开
公开(公告)号：US20240195414A1
公开(公告)日：2024-06-13
申请号：US18063518
申请日：2022-12-08
申请人： CODY JAMES BALLARD , JOEL D. STRAND , THOMAS BERNHARD CHAMBERLIN
发明人： CODY JAMES BALLARD , JOEL D. STRAND , THOMAS BERNHARD CHAMBERLIN
IPC分类号： H03K17/92 , H02M3/04
CPC分类号： H03K17/92 , H02M3/04
摘要： One example includes a superconducting current control system. The system includes an inductive coupler comprising a load inductor and a control inductor. The inductive coupler can be configured to inductively provide a control current from the control inductor to a superconducting circuit device based on a load current being provided through the load inductor. The system also includes a current control element comprising a superconducting quantum interference device (SQUID) array comprising a plurality of SQUIDs. The current control element can be coupled to the inductive coupler to control an amplitude of the load current through the load inductor, and thus to control an amplitude of the control current to the superconducting circuit device.

9. 发明申请

US20190237648A1 CONTROLLING A STATE OF A QUBIT ASSEMBLY VIA TUNABLE COUPLING 审中-公开
公开(公告)号：US20190237648A1
公开(公告)日：2019-08-01
申请号：US15886602
申请日：2018-02-01
申请人： ANTHONY JOSEPH PRZYBYSZ , JOEL D. STRAND
发明人： ANTHONY JOSEPH PRZYBYSZ , JOEL D. STRAND
IPC分类号： H01L39/04 , G06N99/00 , B82Y10/00
CPC分类号： H01L39/045 , B82Y10/00 , G06N10/00
摘要： Methods and apparatuses are provided for controlling the state of a qubit. A qubit apparatus includes a load, a qubit, and a compound Josephson junction coupler coupling the qubit to the load. A coupling controller controls the coupling strength of the compound Josephson junction coupler such that a coupling between the qubit and the load is a first value when a reset of the qubit is desired and a second value during operation of the qubit.

10. 发明申请

US20180261752A1 ZZZ COUPLER FOR SUPERCONDUCTING QUBITS 审中-公开
公开(公告)号：US20180261752A1
公开(公告)日：2018-09-13
申请号：US15455466
申请日：2017-03-10
申请人： DAVID GEORGE FERGUSON , ANTHONY JOSEPH PRZYBYSZ , JOEL D. STRAND
发明人： DAVID GEORGE FERGUSON , ANTHONY JOSEPH PRZYBYSZ , JOEL D. STRAND
IPC分类号： H01L39/02
摘要： Systems and methods are provided for a ZZZ coupler. A first tunable coupler is coupled to the first qubit and tunable via a first control signal. A second tunable coupler is coupled to the first tunable coupler to direct a flux of the first qubit into a tuning loop of the second tunable coupler, such that when a first coupling strength associated with the first tunable coupler is non-zero, a second coupling strength, associated with the second tunable coupler, is a function of a second control signal applied to the second tunable coupler and a state of the first qubit. The second qubit and the third qubit are coupled to one another through the second tunable coupler, such that, when the second coupling strength is non-zero it is energetically favorable for the states of the first and second qubits to assume a specific relationship with respect to the Z-axis.

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