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公开(公告)号：US20170212860A1
公开(公告)日：2017-07-27
申请号：US15003232
申请日：2016-01-21
CPC分类号： G06F13/4027 , G06F13/4068 , G06N99/002 , H01L39/025 , H01L39/223
摘要： A tunable bus-mediated coupling system is provided that includes a first input port coupled to a first end of a variable inductance coupling element through a first resonator and a second input port coupled to a second end of the variable inductance coupling element through a second resonator. The first input port is configured to be coupled to a first qubit, and the second output port is configured to be coupled to a second qubit. A controller is configured to control the inductance of the variable inductance coupling element between a low inductance state to provide strong coupling between the first qubit and the second qubit and a high inductance state to provide isolation between the first qubit and the second qubit.
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公开(公告)号：US20190385088A1
公开(公告)日：2019-12-19
申请号：US16012543
申请日：2018-06-19
IPC分类号： G06N99/00 , H04B10/70 , H04Q3/52 , H04L12/933 , G01R33/035
摘要： Real-time reconfigurability of quantum object connectivity can be provided with one or more quantum routers that can each be configured as either or both of a single-pole double-throw switch and a cross-point switch. The quantum router includes variable-inductance coupling elements in RF-SQUIDs having inductors transformer-coupled to two control flux lines, one providing a static current and the other providing a dynamic current, the direction of which can be toggled to couple or uncouple quantum objects, such as qubits, based on the dynamic current direction to provide reconfigurable quantum routing.
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公开(公告)号：US20180336153A1
公开(公告)日：2018-11-22
申请号：US16026573
申请日：2018-07-03
CPC分类号： G06F13/4027 , G06F13/4068 , G06N10/00 , H01L39/025 , H01L39/223
摘要： A tunable bus-mediated coupling system is provided that includes a first input port coupled to a first end of a variable inductance coupling element through a first resonator and a second input port coupled to a second end of the variable inductance coupling element through a second resonator. The first input port is configured to be coupled to a first qubit, and the second output port is configured to be coupled to a second qubit. A controller is configured to control the inductance of the variable inductance coupling element between a low inductance state to provide strong coupling between the first qubit and the second qubit and a high inductance state to provide isolation between the first qubit and the second qubit.
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公开(公告)号：US20190131944A1
公开(公告)日：2019-05-02
申请号：US15799017
申请日：2017-10-31
申请人： OFER NAAMAN , DAVID GEORGE FERGUSON
发明人： OFER NAAMAN , DAVID GEORGE FERGUSON
摘要： One example includes a parametric amplifier system. The system includes an input/output (I/O) transmission line to propagate a signal tone. The system also includes a non-linearity circuit comprising at least one Josephson junction to provide at least one inductive path of the signal tone in parallel with the at least one Josephson junction. The system further includes an impedance matching network coupled to the I/O transmission line to provide impedance matching of the tone signal between the I/O transmission line and the non-linearity element.
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公开(公告)号：US20200091396A1
公开(公告)日：2020-03-19
申请号：US16690190
申请日：2019-11-21
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.
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公开(公告)号：US20190391214A1
公开(公告)日：2019-12-26
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 , H01L39/22 , G06N99/00
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：US20200279186A1
公开(公告)日：2020-09-03
申请号：US16290324
申请日：2019-03-01
IPC分类号： G06N10/00 , G01R33/035
摘要： One example includes a tunable current-mirror qubit. The qubit includes a plurality of flux tunable elements disposed in a circuit loop. A first portion of the flux tunable elements can be configured to receive a first input flux and a remaining portion of the flux tunable elements can be configured to receive a second input flux to control a mode of the tunable current-mirror qubit between a microwave excitation mode to facilitate excitation or quantum state manipulation of the tunable current-mirror qubit via a microwave input signal and a noise-protected mode to facilitate storage of the quantum state of the tunable current-mirror qubit. The qubit also includes at least one capacitor interconnecting nodes between respective pairs of the flux tunable elements to facilitate formation of Cooper-pair excitons in each of the microwave excitation mode and the noise-protected mode.
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公开(公告)号：US20190156237A1
公开(公告)日：2019-05-23
申请号：US16255588
申请日：2019-01-23
IPC分类号： G06N10/00 , H03K19/195
摘要： Systems and methods are provided for coupling two flux qubits. A quantum circuit assembly includes a first flux qubit, having at least two potential energy minima, and a second flux qubit, having at least two potential energy minima. A system formed by the first and second qubits has at least four potential energy minima prior to coupling, each of the four potential energy minima containing at least one eigenstate of a system comprising the first flux qubit and the second flux qubit. A coupler creates a first tunneling path between a first potential energy minimum of the system and a second potential energy minimum of the system, and a second tunneling path between a third potential energy minimum of the system and a fourth potential energy minimum of the system. The coupler creates the first and second tunneling paths between potential energy minima representing states of equal bit parity.
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公开(公告)号：US20190013065A1
公开(公告)日：2019-01-10
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：US20180261752A1
公开(公告)日：2018-09-13
申请号：US15455466
申请日：2017-03-10
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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