论文标题
表征噪声相关性并通过量子运动增强连贯性
Characterize noise correlation and enhance coherence via qubit motion
论文作者
论文摘要
空间噪声相关性的识别对于开发错误校正的量子设备至关重要，但到目前为止，它几乎没有研究。在这项工作中，我们利用一种称为Qubit Motion的有效新方法来有效地确定7 Quition超导量子系统中任何一对Qubit的噪声相关性。当量子位处于不同的工作频率时，还研究了同一量子对之间的噪声相关性。更重要的是，在具有噪声相关性的多数系统中，我们证明了Qubit运动对逻辑量子量子相干性的增强作用，并且我们提出了一个运动CPMG操作序列，以更有效地保护逻辑状态免受变形的影响，从而通过实验证明，这可以扩展逻辑二级数，即几乎可以通过一个阶来扩展逻辑二级。
The identification of spacial noise correlation is of critical importance in developing error-corrected quantum devices, but it has barely been studied so far. In this work, we utilize an effective new method called qubit motion, to efficiently determine the noise correlations between any pair of qubits in a 7-qubit superconducting quantum system. The noise correlations between the same pairs of qubits are also investigated when the qubits are at distinct operating frequencies. What's more, in this multi-qubit system with the presence of noise correlations, we demonstrate the enhancing effect of qubit motion on the coherence of logic qubit, and we propose a Motion-CPMG operation sequence to more efficiently protect the logic state from decoherence, which is experimentally demonstrated to extend the decoherence time of logic qubit by nearly one order of magnitude.
