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    MULTI-RESONANT COUPLING ARCHITECTURES FOR ZZ INTERACTION REDUCTION
    2.
    发明申请
    MULTI-RESONANT COUPLING ARCHITECTURES FOR ZZ INTERACTION REDUCTION 有权

    公开(公告)号：US20210384896A1

    公开(公告)日：2021-12-09

    申请号：US17135295

    申请日：2020-12-28

    Applicant: International Business Machines Corporation

    Inventor： David C. Mckay ,  Abhinav Kandala ,  Srikanth Srinivasan

    IPC: H03K5/1252 ,  H03K17/92

    Abstract: Systems and techniques that facilitate multi-resonant couplers for preserving ZX interaction while reducing ZZ interaction are provided. In various embodiments, a first qubit can have a first operational frequency and a second qubit can have a second operational frequency, and a multi-resonant architecture can couple the first qubit to the second qubit. In various embodiments, the multi-resonant architecture can comprise a first resonator and a second resonator. In various cases, the first resonator can capacitively couple the first qubit to the second qubit, and a second resonator can capacitively couple the first qubit to the second qubit. In various aspects, the first resonator and the second resonator can be in parallel. In various instances, the first resonator can have a first resonant frequency less than the first operational frequency and the second operational frequency, and the second resonator can have a second resonant frequency greater than the first operational frequency and the second operational frequency. In various other embodiments, the multi-resonant architecture can comprise a resonator, a first end of which can be capacitively coupled to the first qubit and to the second qubit, and a second end of which can be coupled to ground. In various instances, the resonator can have a first harmonic less than the first operational frequency and the second operational frequency, and can have a second harmonic greater than the first operational frequency and the second operational frequency. In various other embodiments, the multi-resonant architecture can comprise a resonator and a direct coupler. In various embodiments, the resonator and the direct coupler can both capacitively couple the first qubit to the second qubit, and the resonator and the direct coupler can be in parallel. In various cases, the direct coupler can couple opposite pads of the first qubit and the second qubit. In various embodiments, a first end of the resonator can be capacitively coupled to the first qubit and the second qubit, a second end of the resonator can be coupled to ground, and the direct coupler can capacitively couple common pads of the first qubit and the second qubit.

    Stark shift cancellation
    4.
    发明授权
    Stark shift cancellation 有权

    公开(公告)号：US12229634B2

    公开(公告)日：2025-02-18

    申请号：US17526852

    申请日：2021-11-15

    Applicant: International Business Machines Corporation

    Inventor： Abhinav Kandala ,  David C. Mckay ,  Srikanth Srinivasan ,  Easwar Magesan ,  Jay Michael Gambetta

    IPC: G06N10/00 ,  G06F15/82 ,  H10N60/12 ,  H10N60/80

    Abstract: Systems and techniques that facilitate Stark shift cancellation are provided. In various embodiments, a system can comprise a control qubit that is coupled to a target qubit. In various cases, the control qubit can be driven by a first tone that entangles the control qubit with the target qubit. In various aspects, the control qubit can be further driven by a second tone simultaneously with the first tone. In various cases, the second tone can have an opposite detuning sign than the first tone. In various instances, the first tone can cause a Stark shift in an operational frequency of the control qubit, and the second tone can cancel the Stark shift.

    Multi-resonant coupling architectures for ZZ interaction reduction
    7.
    发明授权
    Multi-resonant coupling architectures for ZZ interaction reduction 有权

    公开(公告)号：US11728797B2

    公开(公告)日：2023-08-15

    申请号：US17660916

    申请日：2022-04-27

    Applicant: International Business Machines Corporation

    Inventor： David C. Mckay ,  Abhinav Kandala ,  Srikanth Srinivasan

    IPC: H03K17/92 ,  H03K5/1252

    CPC classification number: H03K5/1252 ,  H03K17/92

    Abstract: Systems and techniques that facilitate multi-resonant couplers for preserving ZX interaction while reducing ZZ interaction are provided. In various embodiments, a first qubit can have a first operational frequency and a second qubit can have a second operational frequency, and a multi-resonant architecture can couple the first qubit to the second qubit. In various embodiments, the multi-resonant architecture can comprise a first resonator and a second resonator. In various cases, the first resonator can capacitively couple the first qubit to the second qubit, and a second resonator can capacitively couple the first qubit to the second qubit. In various aspects, the first resonator and the second resonator can be in parallel. In various instances, the first resonator can have a first resonant frequency less than the first operational frequency and the second operational frequency, and the second resonator can have a second resonant frequency greater than the first operational frequency and the second operational frequency. In various other embodiments, the multi-resonant architecture can comprise a resonator, a first end of which can be capacitively coupled to the first qubit and to the second qubit, and a second end of which can be coupled to ground. In various instances, the resonator can have a first harmonic less than the first operational frequency and the second operational frequency, and can have a second harmonic greater than the first operational frequency and the second operational frequency. In various other embodiments, the multi-resonant architecture can comprise a resonator and a direct coupler. In various embodiments, the resonator and the direct coupler can both capacitively couple the first qubit to the second qubit, and the resonator and the direct coupler can be in parallel. In various cases, the direct coupler can couple opposite pads of the first qubit and the second qubit. In various embodiments, a first end of the resonator can be capacitively coupled to the first qubit and the second qubit, a second end of the resonator can be coupled to ground, and the direct coupler can capacitively couple common pads of the first qubit and the second qubit.

    Addressing Cross-Allocated Blocks in a File System
    9.
    发明申请
    Addressing Cross-Allocated Blocks in a File System 有权
    解决文件系统中的交叉分配块

    公开(公告)号：US20150370850A1

    公开(公告)日：2015-12-24

    申请号：US14838820

    申请日：2015-08-28

    Applicant: International Business Machines Corporation

    Inventor： Kalyan C. Gunda ,  Srikanth Srinivasan

    IPC: G06F17/30

    CPC classification number: G06F17/30371 ,  G06F11/1435 ,  G06F11/1453 ,  G06F17/30088 ,  G06F17/30138 ,  G06F17/30194

    Abstract: A mechanism is provided for cross-allocated block repair in a mounted file system. A set of cross-allocated blocks are identified from a plurality of blocks within an inode of the mounted file system, based on a corresponding bit associated with each cross-allocated block in a duplicated block information bitmap being in a first identified state. The set of cross-allocated blocks are repaired using a user-defined repair process. Then one or more of the set of cross-allocated blocks are deallocated based on results of the user-defined repair process.

    Abstract translation: 在安装的文件系统中提供了用于交叉分配块修复的机制。 基于在处于第一识别状态的复制块信息位图中与每个交叉分配的块相关联的对应位，从安装的文件系统的inode中的多个块中识别一组交叉分配的块。 交叉分配块的集合使用用户定义的修复过程进行修复。 然后，基于用户定义的修复过程的结果，将一组或多个交叉分配的块解除分配。

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