论文标题
通过在谐振和色散式的超导谐振器中耦合两个电荷量子A
Coupling two charge qubits via a superconducting resonator operating in the resonant and dispersive regimes
论文作者
论文摘要
半导体量子点电荷量子A的关键挑战是实现了基于IT的远程量子耦合和执行高保真门的实现。在这里，我们描述了一种新型的电荷Qubit，该电荷Qubit是由限制在三量器点系统中的电子形成的，该电子量子系统可以在双极和四极引起令人失望的甜点中工作。我们进一步介绍了电荷值和超导谐振器之间的远程偶极耦合的形式。基于由Qubits和谐振器组成的混合系统，我们提出了两种类型的纠缠门：动态ISWAP门和自动纠缠栅极，它们分别在分散性和共振机中运行。我们发现，对于实验中典型的噪声水平，ISWAP门的保真度可以达到高于99 \％的保真度。同时，如果谐振器中的非谐声足够大，那么自动门的忠诚度可能会超过98 \％。我们的建议提供了一种替代有用的方法来建立半导体量子点中电荷量子位的高保真量子计算。
A key challenge for semiconductor quantum-dot charge qubits is the realization of long-range qubit coupling and performing high-fidelity gates based on it. Here, we describe a new type of charge qubit formed by an electron confined in a triple-quantum-dot system, enabling single and two-qubit gates working in the dipolar and quadrupolar detuning sweet spots. We further present the form for the long-range dipolar coupling between the charge qubit and the superconducting resonator. Based on the hybrid system composed of the qubits and the resonator, we present two types of entangling gates: the dynamical iSWAP gate and holonomic entangling gate, which are operating in the dispersive and resonant regimes, respectively. We find that the fidelity for the iSWAP gate can reach fidelity higher than 99\% for the noise level typical in experiments. Meanwhile, the fidelity for the holonomic gate can surpass 98\% if the anharmonicity in the resonator is large enough. Our proposal offers an alternative useful way to build up high-fidelity quantum computation for charge qubits in semiconductor quantum dot.
