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Robust two-qubit gates for exchange-coupled qubits

机译:用于交换耦合量子位的稳健两量子位门

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摘要

We present composite pulse sequences that perform fault-tolerant two-qubit gate operations on exchange-only quantum-dot spin qubits in various experimentally relevant geometries. We show how to perform dynamically corrected two-qubit gates in exchange-only systems with the leading hyperfine error term canceled. These pulse sequences are constructed to conform to the realistic experimental constraint of strictly non-negative couplings. We establish that our proposed pulse sequences lead to several orders of magnitude improvement in the gate fidelity compared with their uncorrected counterparts. Together with single-qubit dynamically corrected gates, our results enable noise-resistant universal quantum operations with exchange-only qubits.
机译:我们提出了在各种实验相关几何中对仅交换量子点自旋量子位执行容错两量子位门运算的复合脉冲序列。我们展示了如何在取消了前导超精细误差项的情况下,在仅交换系统中执行动态校正的两比特门。构造这些脉冲序列以符合严格的非负耦合的实际实验约束。我们确定,与未校正的脉冲序列相比,我们提出的脉冲序列可以使门的保真度提高几个数量级。结合单量子位动态校正的门,我们的结果可通过仅交换的量子位实现抗噪通用量子运算。

著录项

  • 来源
    《Physical review》 |2014年第8期|085314.1-085314.8|共8页
  • 作者单位

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA ,Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA;

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA ,Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA;

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA ,Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA;

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA;

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA ,Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantum error correction and other methods for protection against decoherence; quantum computation; quantum dots;

    机译:量子误差校正和其他防止退相干的方法;量子计算量子点;

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