Entanglement generation via power-of-SWAP operations between dynamic electron-spin qubits
Entanglement generation via power-of-SWAP operations between dynamic electron-spin qubits
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DOI：
10.1103/physreva.101.022329
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发表时间：
2020-02-24
影响因子：
2.9
通讯作者：
Barnes, Crispin H. W.
中科院分区：
文献类型：
--
作者：
Lepage, Hugo, V;Lasek, Aleksander A.;Barnes, Crispin H. W.
表面声波（SAW）可以在压电材料中产生运动的量子点。在这里，我们展示了位于动态量子点上的电子自旋量子比特是如何纠缠的。以前的量子点纠缠产生的理论和数值模型已经不足以在现实的实验设备中研究量子动力学。我们利用国家的最先进的图形处理单元来模拟波函数动力学的两个电子进行SAW通过一个二维半导体异质结构。我们建立了一个方法来实现一个电源的交换门通过库仑相互作用。SAW架构的一个好处是它提供了一种通过静电势传输量子位的相干方式。这种架构使我们能够避免与快速控制脉冲相关的问题，并保证操作的一致性，从而提供优于静态量子位的优势。对于interdot势垒高度的双重占用能量是足够大于双点跳跃能量，我们发现，参数的基础上，在GaAs/AlGaAs异质结的实验可以产生高保真根的SWAP操作。我们的研究结果提供了一个动态量子比特量子计算的关键组成部分的方法。
Surface acoustic waves (SAWs) can create moving quantum dots in piezoelectric materials. Here we show how electron-spin qubits located on dynamic quantum dots can be entangled. Previous theoretical and numerical models of quantum-dot entanglement generation have been insufficient to study quantum dynamics in realistic experimental devices. We utilize state-of-the-art graphics processing units to simulate the wave-function dynamics of two electrons carried by a SAW through a two-dimensional semiconductor heterostructure. We build a methodology to implement a power-of-SWAP gate via the Coulomb interaction. A benefit of the SAW architecture is that it provides a coherent way of transporting the qubits through an electrostatic potential. This architecture allows us to avoid problems associated with fast control pulses and guarantees operation consistency, providing an advantage over static qubits. For interdot barrier heights where the double occupation energy is sufficiently greater than the double-dot hopping energy, we find that parameters based on experiments in GaAs/AlGaAs heterostructures can produce a high-fidelity root-of-SWAP operation. Our results provide a methodology for a crucial component of dynamic-qubit quantum computing.