论文标题
双量子点中孔旋转Qubit的量子控制
Quantum control of hole spin qubits in double quantum dots
论文作者
论文摘要
半导体量子点（QD）中的孔自旋速度因其与核自旋的弱偶联以及强旋转轨道耦合，因此可以进行量子信息处理，这是有望进行量子信息处理的候选者。我们通过快速的绝热驾驶方案对双QD中的两个重孔自旋量值进行了连贯的控制，这比其他实验常用的方案有助于实现更高的忠诚度，例如线性倾斜，$π$ - 泵或兰道 - Zener passage。通过自旋轨道耦合使用快速的准绝热驱动，可以显着降低量子操作的电荷噪声，并实现高稳定性的量子初始化。我们还以双QD的孔旋转的孔旋转，尤其不是cnot和掉期式的大门，尤其不是cnot和交换式门，可实现高于$ 99 \％$的忠诚度，表现出孔旋转的能力，可以实现通用门以实现量子计算。
Hole spin qubits in semiconductor quantum dots (QDs) are promising candidates for quantum information processing due to their weak hyperfine coupling to nuclear spins, and to the strong spin-orbit coupling which allows for rapid operation time. We propose a coherent control on two heavy-hole spin qubits in a double QD by a fast adiabatic driving protocol, which helps to achieve higher fidelities than other experimentally commonly used protocols as linear ramping, $π$-pulses or Landau-Zener passages. Using fast quasiadiabatic driving via spin-orbit coupling, it is possible to reduce charge noise significantly for qubit manipulation and achieve high robustness for the qubit initialization. We also implement one and two-qubit gates, in particular, NOT, CNOT, and SWAP-like gates, of hole spins in a double QD achieving fidelities above $99\%$, exhibiting the capability of hole spins to implement universal gates for quantum computing.
