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公开(公告)号：US10074792B1
公开(公告)日：2018-09-11
申请号：US15455466
申请日：2017-03-10
IPC分类号： H03K19/195 , H01L39/02 , G06N99/00
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.
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公开(公告)号：US10749095B2
公开(公告)日：2020-08-18
申请号：US16690190
申请日：2019-11-21
IPC分类号： H03K19/195 , H01L39/02 , 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.
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公开(公告)号：US10989767B2
公开(公告)日：2021-04-27
申请号：US17065373
申请日：2020-10-07
申请人： David George Ferguson , Sergey S. Novikov , Anthony Joseph Przybysz , Robert T. Hinkey , Aaron A. Pesetski , Kenneth M. Zick
发明人： David George Ferguson , Sergey S. Novikov , Anthony Joseph Przybysz , Robert T. Hinkey , Aaron A. Pesetski , Kenneth M. Zick
IPC分类号： G01R33/035 , H01L39/22 , G06N10/00
摘要： One example includes a tunable current element. The element includes a first magnetic flux component that is configured to exhibit a bias flux in response to a first control current. The bias flux can decrease relative energy barriers between discrete energy states of the tunable current element. The element also includes a second magnetic flux component that is configured to exhibit a control flux in response to a second control current. The control flux can change a potential energy of the discrete energy states of the tunable current element to set an energy state of the tunable current element to one of the discrete energy states, such that the magnetic flux component is configured to generate a hysteretic current that provides a magnetic flux at an amplitude corresponding to the energy state of the tunable current element.
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公开(公告)号：US10262727B2
公开(公告)日：2019-04-16
申请号：US15645736
申请日：2017-07-10
摘要： One example includes a flux qubit readout circuit. The circuit includes a gradiometric SQUID that is configured to inductively couple with a gradiometric flux qubit to modify flux associated with the gradiometric superconducting quantum interference device (SQUID) based on a flux state of the flux qubit. The circuit also includes a current source configured to provide a readout current through the gradiometric SQUID during a state readout operation to determine the flux state of the gradiometric flux qubit at a readout node.
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公开(公告)号：US10097186B1
公开(公告)日：2018-10-09
申请号：US15910254
申请日：2018-03-02
申请人： Ryan J. Epstein , David James Clarke , Alexander Marakov , Gregory R. Boyd , Anthony Joseph Przybysz , Joel D. Strand , David George Ferguson
发明人： Ryan J. Epstein , David James Clarke , Alexander Marakov , Gregory R. Boyd , Anthony Joseph Przybysz , Joel D. Strand , David George Ferguson
IPC分类号： H03K19/195 , G06N99/00 , H03K3/38 , H03K19/16
摘要： Systems and methods are provided for linking two components in a superconducting circuit. A plurality of circuit elements, each comprising one of an inductor, a capacitor, and a Josephson junction, are connected in series on a path connecting the two components. A plurality of tunable oscillators are connected from the path connecting the two components. Each tunable oscillator is responsive to a control signal to tune an associated resonance frequency of the tunable oscillator within a first frequency range, within which the two components are coupled, and within a second frequency range, within which the two components are isolated.
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公开(公告)号：US10884033B2
公开(公告)日：2021-01-05
申请号：US16277560
申请日：2019-02-15
IPC分类号： G01R19/00 , G06N10/00 , G01R33/035 , G11C11/44 , H01L39/02
摘要： One example includes a current device readout system. The system includes a tunable resonator having a resonant frequency that is associated with a current state of a current device. The tunable resonator can be configured to receive a tone signal having a predetermined frequency from a feedline to determine the current state of the current device. The system also includes an isolation device inductively interconnecting the tunable resonator and the current device. The isolation device can be tunable to isolate the current device in a first state and to facilitate the determination of the current state of the current device in a second state.
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公开(公告)号：US10852366B2
公开(公告)日：2020-12-01
申请号：US16019210
申请日：2018-06-26
申请人： David George Ferguson , Sergey S. Novikov , Anthony Joseph Przybysz , Robert T. Hinkey , Aaron A. Pesetski , Kenneth M. Zick
发明人： David George Ferguson , Sergey S. Novikov , Anthony Joseph Przybysz , Robert T. Hinkey , Aaron A. Pesetski , Kenneth M. Zick
IPC分类号： G01R33/035 , G06N10/00 , H01L39/22
摘要： One example includes a magnetic flux source system that includes a tunable current element. The tunable current element includes a SQUID inductively coupled to a first control line that conducts a first control current that induces a bias flux in the SQUID to decrease relative energy barriers between discrete energy states of the tunable current element. The system also includes an inductor in a series loop with the SQUID and inductively coupled to a second control line that conducts a second control current that induces a control flux in the series loop to change a potential energy of the discrete energy states of the tunable current element to set an energy state of the tunable current element to one of the discrete energy states to generate a current that provides a magnetic flux at an amplitude corresponding to the energy state of the at least one tunable current element.
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公开(公告)号：US20200264213A1
公开(公告)日：2020-08-20
申请号：US16277560
申请日：2019-02-15
IPC分类号： G01R19/00 , G06N10/00 , G11C11/44 , G01R33/035 , H01L39/02
摘要： One example includes a current device readout system. The system includes a tunable resonator having a resonant frequency that is associated with a current state of a current device. The tunable resonator can be configured to receive a tone signal having a predetermined frequency from a feedline to determine the current state of the current device. The system also includes an isolation device inductively interconnecting the tunable resonator and the current device. The isolation device can be tunable to isolate the current device in a first state and to facilitate the determination of the current state of the current device in a second state.
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公开(公告)号：US10546993B2
公开(公告)日：2020-01-28
申请号：US16037539
申请日：2018-07-17
IPC分类号： H03K19/195 , H01L39/02 , 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.
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公开(公告)号：US11646734B1
公开(公告)日：2023-05-09
申请号：US17745408
申请日：2022-05-16
IPC分类号： H03K17/92
CPC分类号： H03K17/92
摘要： Systems and methods are provided for resetting a qubit comprising a superconducting loop and a compound Josephson junction. A first bias flux is provided to the superconducting loop. A second bias flux is provided to the compound Josephson junction. Each of the first bias flux and the second bias flux are provided such that a given excited state of the qubit is near a top of a potential barrier associated with a potential of the qubit. A continuous microwave signal is generated having a frequency equal to a transition frequency between an other excited state of the qubit and the given excited state.
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