论文标题
在交换耦合半导体旋转Qubits中对多Quibit嘈杂动力学的精确分析处理
Exact analytical treatment of multiqubit noisy dynamics in exchange-coupled semiconductor spin qubits
论文作者
论文摘要
电荷噪声仍然是用半导体旋转量子台开发量子信息技术的主要障碍。我们使用精确的分析计算来确定准电荷噪声对三个均等交换耦合量子点的环的影响。我们从特定的初始状态计算出障碍平均的回报概率，并使用它来确定连贯性时间T2*，并表明它仅取决于疾病强度，而不是平均相互作用强度。我们还使用一种扰动方法来研究三个或四个量子位的其他布置，发现回报概率包含多个振荡频率。这些振荡以高斯方式衰减，由哈密顿量能量水平的差异决定。我们给出了导致几个目标保真度的栅极时间的定量值。我们发现，反应时间随量子数量的增加而减小。我们的工作为耦合旋转Qub的电荷噪声动力学提供了有用的分析洞察力。
Charge noise remains the primary obstacle to the development of quantum information technologies with semiconductor spin qubits. We use an exact analytical calculation to determine the effects of quasistatic charge noise on a ring of three equally spaced exchange-coupled quantum dots. We calculate the disorder-averaged return probability from a specific initial state, and use it to determine the coherence time T2* and show that it depends only on the disorder strength and not the mean interaction strength. We also use a perturbative approach to investigate other arrangements of three or four qubits, finding that the return probability contains multiple oscillation frequencies. These oscillations decay in a Gaussian manner, determined by differences in energy levels of the Hamiltonian. We give quantitative values for gate times resulting in several target fidelities. We find that the decoherence time decreases with increasing number of qubits. Our work provides useful analytical insight into the charge noise dynamics of coupled spin qubits.
