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Coupling two spin qubits with a high-impedance resonator

机译：用高阻抗谐振器耦合两个自旋量子比特

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摘要

Fast, high-fidelity single and two-qubit gates are essential to building a viable quantum information processor, but achieving both in the same system has proved challenging for spin qubits. We propose and analyze an approach to perform a long-distance two-qubit controlled phase (CPHASE) gate between two singlet-triplet qubits using an electromagnetic resonator to mediate their interaction. The qubits couple longitudinally to the resonator, and by driving the qubits near the resonator's frequency, they can be made to acquire a state-dependent geometric phase that leads to a CPHASE gate independent of the initial state of the resonator. Using high impedance resonators enables gate times of order 10 ns while maintaining long coherence times. Simulations show average gate fidelities of over 96% using currently achievable experimental parameters and over 99% using state-of-the-art resonator technology. After optimizing the gate fidelity in terms of parameters tuneable in situ, we find it takes a simple power-law form in terms of the resonator's impedance and quality and the qubits' noise bath.
机译：快速，高保真的单量子比特和两个量子比特的门对于构建可行的量子信息处理器至关重要，但是事实证明，在同一个系统中实现这两者对于自旋量子比特来说具有挑战性。我们提出并分析了一种方法，该方法使用电磁谐振器在两个单重态-三重态量子位之间执行长距离二量子位控制相位（CPHASE）门操作。量子位纵向耦合到谐振器，并且通过在谐振器的频率附近驱动量子位，可以使它们获得与状态有关的几何相位，该相位取决于几何相位，该相位导致CPHASE门独立于谐振器的初始状态。使用高阻抗谐振器可使栅极时间约为10 ns，同时保持较长的相干时间。仿真显示，使用当前可获得的实验参数，平均栅极保真度超过96％，使用最新的谐振器技术，平均保真度超过99％。在根据可现场调整的参数优化了栅极保真度之后，我们发现它在谐振器的阻抗和质量以及量子比特的噪声浴方面采用了简单的幂律形式。

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  • 来源
    《Physical review. B, Condensed Matter And Materals Physics》 |2018年第23期|235409.1-235409.10|共10页
  • 作者

    S. P. Harvey; C. G. L. B0ttcher; L. A. Orona; S. D. Bartlett; A. C. Doherty; A. Yacoby;

  • 作者单位

    Department ofPhysics, Harvard University, Cambridge, MA 02138, USA;

    Department ofPhysics, Harvard University, Cambridge, MA 02138, USA;

    Department ofPhysics, Harvard University, Cambridge, MA 02138, USA;

    Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, Sydney, NSW 2006, Australia;

    Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, Sydney, NSW 2006, Australia;

    Department ofPhysics, Harvard University, Cambridge, MA 02138, USA;

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