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Environment-protected solid-state-based distributed charge qubit

机译：环保型固态分布式电荷量子比特

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摘要

A solid-state-based charge qubit is presented. The system consists of a one-dimensional wire with a pair of qubits embedded at its center. It is shown that the system supports collective states localized in the left and right sides of the wire and therefore, as a whole, performs as a single qubit. The couplings between the ground and excited states of the two central qubits are inversely proportional making them fully asynchronized and allowing for coherent manipulation and gate operations. Initialization and measurement devices, such as leads and charge detectors, connected to the edges of the wire are modeled by a continuum of energy states. The coupling to the continuum is discussed using the effective non-Hermitian Hamiltonian. At weak continuum coupling, all internal states uniformly acquire small decay widths. This changes dramatically as the coupling strength increases: the width distribution undergoes a sharp restructuring and is no longer uniformly divided among the eigenstates. Two broad resonances localized at the ends of the wire are formed. These superradiant states (analogous to Dicke states in quantum optics) effectively protect the remaining internal states from decaying into the continuum and hence increase the lifetime of the qubit. Environmental noise is introduced by considering random Gaussian fluctuations of electronic energies. The interplay between decoherence and superradiance is studied by solving the stochastic Liouville equation. In addition to increasing the lifetime, the emergence of the superradiant states increases the qubit coherence.
机译：提出了一种基于固态的电荷量子位。该系统由一维导线组成，在其中心嵌入一对量子位。结果表明，该系统支持位于导线左侧和右侧的集体状态，因此，总体上，该状态仅作为一个qubit起作用。两个中央量子位的基态和激发态之间的耦合成反比，从而使它们完全不同步，并允许相干的操纵和门操作。连接到导线边缘的初始化和测量设备（例如导线和电荷检测器）通过连续的能量状态建模。使用有效的非埃尔米特哈密顿量讨论了与连续体的耦合。在弱连续谱耦合下，所有内部状态均匀地获得较小的衰减宽度。随着耦合强度的增加，这种变化发生了巨大变化：宽度分布经历了急剧的重组，并且不再均匀地分布在本征态之间。形成了两个位于导线末端的宽共振。这些超辐射态（类似于量子光学中的狄克态）有效地保护了剩余的内部态，使其不衰减为连续体，从而延长了量子比特的寿命。通过考虑电子能量的随机高斯波动来引入环境噪声。通过求解随机的Liouville方程，研究了退相干与超辐射之间的相互作用。除了增加寿命外，超辐射态的出现还增加了量子位相干性。

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  • 来源
    《Physical review》 |2016年第23期|235150.1-235150.11|共11页
  • 作者

    Amin Tayebi; Tanya Nicole Hoatson; Joie Wang; Vladimir Zelevinsky;

  • 作者单位

    Department of Electrical and Computer Engineering, College of Engineering, Michigan State University, East Lansing, Michigan 48824, USA,Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA;

    Stanford University, Stanford, California 94305, USA;

    University of Chicago, Chicago, Illinois 60637, USA;

    Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA,National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA;

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