公开(公告)号：US11615336B2

公开(公告)日：2023-03-28

申请号：US17188461

申请日：2021-03-01

申请人： Massachusetts Institute of Technology ,  SOCPRA SCIENCES ET GENIE S.E.C.

发明人： William D. Oliver ,  Simon Gustavsson ,  Roni Winik ,  Catherine Leroux ,  Agustin Di Paolo ,  Alexandre Blais

IPC分类号： G06N10/00 ,  H01L39/22 ,  H01L39/02

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.

公开(公告)号：US10262276B2

公开(公告)日：2019-04-16

申请号：US15988693

申请日：2018-05-24

申请人： SOCPRA SCIENCES ET GENIE S.E.C.

发明人： Shruti Puri ,  Arne L. Grimsmo ,  Alexandre Blais ,  Christian Kraglund Andersen

IPC分类号： H03K3/38 ,  G06N99/00 ,  H03B17/00 ,  H03F19/00

摘要： A method of quantum processing using a quantum processor comprising a plurality of Kerr non-linear oscillators (KNOs), each operably drivable by both i) a controllable single-boson drive and ii) a controllable two-boson drive, the method comprising simultaneously controlling a drive frequency and a drive amplitude of the controllable single-boson drives to define a problem and controlling a drive frequency and a drive amplitude of the two-photon drives to define the Hilbert space, including increasing the amplitude of the two-boson drive and reaching both amplitude conditions a) 4 times the amplitude of the two-boson drives being greater than the loss rate, and b) the amplitude of the two-boson drives being greater than the amplitude of the single-boson drive, and maintaining both amplitude conditions a) and b) until a solution to the problem is reached; and reading the solution.