论文标题
电容性耦合单线旋转QPIT速度的电荷噪声抑制磁场下的电荷噪声
Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field
论文作者
论文摘要
电荷噪声是防止高保真操作的主要障碍，尤其是基于半导体 - 量词点旋转Qubits的高保真操作。尽管已经在几种类型的自旋Qub中证明了充电噪声的某些甜蜜斑点，但尚不清楚一个用于耦合的单线 - 三个旋转量子的旋转量子。从理论上讲，使用完整的配置交互计算，当外部施加足够强的磁场时，耦合的单线量子Qubit System出现了一系列几乎甜点。我们进一步证明，使用基于快捷方式到绝热性的序列从明智地选择的几乎选择点上升起，提供了电荷噪声和声子引起的脱碳的最大栅极保真度。这些结果应有助于实现高保真性在单线量子Qubit Systems中的高保真两个Quibent。
Charge noise is the main hurdle preventing high-fidelity operation, in particular that of two-qubit gates, of semiconductor-quantum-dot-based spin qubits. While certain sweet spots where charge noise is substantially suppressed have been demonstrated in several types of spin qubits, the existence of one for coupled singlet-triplet qubits is unclear. We theoretically demonstrate, using full configuration-interaction calculations, that a range of nearly sweet spots appear in the coupled singlet-triplet qubit system when a strong enough magnetic field is applied externally. We further demonstrate that ramping to and from the judiciously chosen nearly sweet spot using sequences based on the shortcut to adiabaticity offers maximal gate fidelities under charge noise and phonon-induced decoherence. These results should facilitate realization of high-fidelity two-qubit gates in singlet-triplet qubit systems.
