Strong charge-photon coupling allows the coherent coupling of a charge qubit, realized by a single charge carrier (either an electron or a hole) in a double quantum dot, to photons of a microwave resonator. Here, we theoretically demonstrate that, in the dispersive regime, the photons can mediate both an iSWAP gate as well as a iSWAP gate between two distant charge qubits. We provide a thorough discussion of the impact of the dominant noise sources, resonator damping and charge qubit dephasing on the average gate fidelity. Assuming a state-of-the art resonator decay rate and charge qubit dephasing rate, the predicted average gate fidelities are below 90%. However, a decrease of the charge qubit dephasing rate by one order of magnitude is conjectured to result in gate fidelities surpassing 95%.

中文翻译：

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远程电荷量子位之间的谐振器介导的量子门


强电荷-光子耦合允许电荷量子位（通过双量子点中的单个电荷载流子（电子或空穴）实现）与微波谐振器的光子相干耦合。在这里，我们从理论上证明，在色散状态下，光子可以介导 iSWAP 门以及两个远距离电荷量子位之间的 iSWAP 门。我们深入讨论了主要噪声源、谐振器阻尼和电荷量子位相移对平均门保真度的影响。假设采用最先进的谐振器衰减率和电荷量子位移相率，则预测的平均门保真度低于 90%。然而，推测电荷量子位相移率降低一个数量级会导致门保真度超过 95%。