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1.发明授权公开(公告)号：US12069966B2
公开(公告)日：2024-08-20
申请号：US17545592
申请日：2021-12-08
申请人： Britton Plourde
发明人： Britton Plourde
CPC分类号： H10N60/805 , G06N10/00 , H10N60/85
摘要： Superconducting metamaterials composed of lumped-element inductors and capacitors are used to implement microwave photonics with novel dispersion relations and dense mode spectra that can be coupled to qubits. Metamaterial lattices may have qubits coupled to different unit cells in the metamaterial such that each qubit will couple strongly to modes with an antinode at the qubit location. Through simultaneous driving of combinations of modes, large amplitudes are produced at only one or a few unit cells, resulting in large ac Stark shifts of qubits located there, and providing a frequency-addressable qubit array without requiring flux-tunability and with reduced control wiring.
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公开(公告)号：US20230263075A1
公开(公告)日：2023-08-17
申请号：US17898880
申请日：2022-08-30
发明人： Zihao Yang , Mingwei Zhu , Lan Yu , Zhebo Chen , Robert Jan Visser , Nag Patibandla
CPC分类号： H01L39/2493 , G06N10/40 , H01L39/025
摘要： Exemplary methods of fabricating high quality quantum computing components are described. The methods include removing native oxide from a deposition surface of a silicon substrate in a cleaning chamber of a processing system, and transferring the silicon substrate under vacuum to a deposition chamber of the processing system. The methods further include depositing an aluminum layer on the deposition surface of the silicon substrate in the deposition chamber, where an interface between the aluminum layer and the deposition surface of the silicon substrate is oxygen free.
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公开(公告)号：US20230210019A1
公开(公告)日：2023-06-29
申请号：US17564133
申请日：2021-12-28
发明人： Steven J. Holmes , Devendra K. Sadana , Oleg Gluschenkov , Martin O. Sandberg , Marinus Johannes Petrus Hopstaken , Yasir Sulehria
CPC分类号： H01L39/223 , H01L39/12 , H01L39/025 , H01L39/2493
摘要： A Josephson Junction qubit device is provided. The device includes a substrate of silicon material. The device includes first and second electrodes of superconducting metal. The device may include a nanowire created by direct ion implantation on to the silicon material to connect the first and second electrodes. The device may include first and second superconducting regions created by direct ion implantation on to the silicon material, the first superconducting region connecting the first electrode and the second superconducting region connecting the second electrode, with a silicon channel formed by a gap between the first and second superconducting regions.
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公开(公告)号：US20230210018A1
公开(公告)日：2023-06-29
申请号：US17564122
申请日：2021-12-28
CPC分类号： H01L39/223 , H01L39/2493 , H01L27/18 , H01L39/12 , H01L39/025 , G06N10/00
摘要： A vertical Josephson Junction (JJ) qubit device that is fabricated from crystalline silicon material is provided. The JJ device has a substrate of epitaxial silicon, a lower superconducting electrode that is a superconducting region of the epitaxial silicon and an upper superconducting electrode of a metallic superconductor. The JJ device also has a junction layer. A section of the junction layer between the lower and upper superconducting electrodes forms a junction of the JJ device. Resonator and/or capacitor wiring of the JJ device is also fabricated using the metallic superconductor. The superconducting region is epitaxial silicon that is doped or implanted with boron or gallium. The substrate, the junction layer, and the implanted epitaxial silicon share a contiguous crystalline structure.
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公开(公告)号：US11678591B2
公开(公告)日：2023-06-13
申请号：US17037109
申请日：2020-09-29
CPC分类号： H01L39/025 , G06N10/00 , H01L39/04 , H01L39/223 , H01L39/2493
摘要： Devices, systems, methods, and/or computer-implemented methods that can facilitate a qubit device comprising a vacuum encapsulated Josephson junction are provided. According to an embodiment, a device can comprise a substrate having an encapsulated vacuum cavity provided on the substrate. The device can further comprise one or more superconducting components of a superconducting circuit provided inside the encapsulated vacuum cavity.
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公开(公告)号：US11665981B2
公开(公告)日：2023-05-30
申请号：US17194046
申请日：2021-03-05
CPC分类号： H01L39/025 , G06N10/00 , H01L39/045 , H01L39/223 , H01L39/249 , H01L39/2493 , H01L21/02603 , H01L2221/1094
摘要： A method of producing a quantum circuit includes forming a mask on a substrate to cover a first portion of the substrate, implanting a second portion of the substrate with ions, and removing the mask, thereby providing a nanowire. The method further includes forming a first lead and a second lead, the first lead and the second lead each partially overlapping the nanowire. In operation, a portion of the nanowire between the first and second leads forms a quantum dot, thereby providing a quantum dot Josephson junction. The method further includes forming a third lead and a fourth lead, one of the third and fourth leads partially overlapping the nanowire, wherein the third lead is separated from the fourth lead by a dielectric layer, thereby providing a Dolan bridge Josephson junction. The nanowire is configured to connect the quantum dot Josephson junction and the Dolan bridge Josephson junction in series.
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公开(公告)号：US11616187B2
公开(公告)日：2023-03-28
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.
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公开(公告)号：US11615336B2
公开(公告)日：2023-03-28
申请号：US17188461
申请日：2021-03-01
发明人： William D. Oliver , Simon Gustavsson , Roni Winik , Catherine Leroux , Agustin Di Paolo , Alexandre Blais
摘要： A quantum circuit called a “qumon” is provided to cancel unwanted ZZ interaction in a superconducting qubit architecture. The qumon qubit has a high coherence, and a positive anharmonicity that may be tuned to cancel the negative anharmonicity in a coupled qubit, such as a transmon qubit. The qumon has three parallel branches, in which are a shunt capacitor; a Josephson junction having weighted energy level and capacitance; and several Josephson junctions in series. The weight is chosen to provide the desired anharmonicity, and the transverse flux noise and transverse charge noise each decrease in proportion to the number of the Josephson junctions in series. Because unwanted ZZ interactions are canceled, qumon qubits and transmon qubits may be capacitively coupled in an alternating pattern to provide a surface code in which these interactions are canceled in an extensible way.
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公开(公告)号：US11587976B2
公开(公告)日：2023-02-21
申请号：US16917056
申请日：2020-06-30
发明人： Aaron Finck , April Carniol , John Blair
摘要： Devices and/or computer-implemented methods facilitating static ZZ suppression and Purcell loss reduction using mode-selective coupling in two-junction superconducting qubits are provided. In an embodiment, a device can comprise a superconducting bus resonator. The device can further comprise a first superconducting qubit. The device can further comprise a second superconducting qubit, the first superconducting qubit and the second superconducting qubit respectively comprising: a first superconducting pad; a second superconducting pad; a third superconducting pad; a first Josephson Junction coupled to the first superconducting pad and the second superconducting pad; and a second Josephson Junction coupled to the second superconducting pad and the third superconducting pad. The first superconducting pad and the second superconducting pad of the first superconducting qubit and the second superconducting qubit are coupled to the superconducting bus resonator. The superconducting bus resonator entangles the first superconducting qubit and the second superconducting qubit based on receiving a control signal.
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公开(公告)号：US11545288B2
公开(公告)日：2023-01-03
申请号：US16849595
申请日：2020-04-15
申请人： Joel D. Strand
发明人： Joel D. Strand
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.
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