A highly tunable quadruple quantum dot in a narrow bandgap semiconductor InAs nanowire
A highly tunable quadruple quantum dot in a narrow bandgap semiconductor InAs nanowire
复制标题
窄带隙半导体 InAs 纳米线中高度可调的四重量子点
作者：
Jingwei Mu;Shaoyun Huang;Zhi-Hai Liu;Weijie Li;Ji-Yin Wang;Dong Pan;Guang-Yao Huang;Yuanjie Chen;Jianhua Zhao;H. Q. Xu
由半导体制成的量子点（QDs）就是其中之一。最有前途的量子计算发展平台。它们具有高密度集成和与标准半导体兼容的优点。芯片制造技术与其他平台相比…然而，高可调谐半导体的发展。多量子点系统仍然是一个重大挑战。在这里，我们演示了一个高度可调谐的线性电路的实现。窄带隙半导体InAs中的四重量子点（QQD）。采用细指栅技术制备纳米线。qqqd是由。线性响应体系中的电子输运测量。特征二维电荷稳定性图包含。有四组不同斜率的谐振电流线。为腾讯网获取。结果表明，这些电流线来源于共振电子输运，并且可以单独归于共振电子输运。通过不同量子点的能级。受益于。优异的栅极可调谐性，我们也演示了调谐。从量子点到两个量子点的能级，三个。量子点和所有四个量子点分别处于能量共振状态。源极和漏极触点的费米电平。建立了线性QQD的电容网络模型。基于该模型的模拟电荷稳定性图如图所示。与实验结果吻合良好。我们的工作提供了坚实的基础。实验证明窄带隙半导体纳米线。多个量子点可以作为一个通用平台来实现量子计算和执行的集成量子比特。复杂多体系统的量子模拟。
Quantum dots (QDs) made from semiconductors are among the.most promising platforms for the development of quantum computing.and simulation chips, and they have the advantages of high.density integration and compatibility with the standard semiconductor.chip fabrication technology compared to other platforms..However, the development of a highly tunable semiconductor.multiple QD system still remains a major challenge..Here, we demonstrate the realization of a highly tunable linear.quadruple QD (QQD) in a narrow bandgap semiconductor InAs.nanowire via a fine finger gate technique. The QQD is studied by.electron transport measurements in the linear response regime..Characteristic two-dimensional charge stability diagrams containing.four groups of resonant current lines of different slopes are.obtained for the QQD. It is shown that these current lines arise.from and can be individually assigned to resonant electron transport.through the energy levels of different QDs. Benefitting from.the excellent gate tunability, we also demonstrate the tuning of.the QQD to regimes where the energy levels of two QDs, three.QDs and all four QDs are energetically in resonance, respectively,.with the Fermi level of the source and drain contacts. A capacitance.network model is developed for the linear QQD and the.simulated charge stability diagrams based on this model show.good agreement with the experiments. Our work provides solid.experimental evidence that narrow bandgap semiconductor nanowire.multiple QDs could be used as a versatile platform to achieve.integrated qubits for quantum computing and to perform.quantum simulations of complex many-body systems.