论文标题
超导Qubit的强大动力解耦的过程断层扫描
Process tomography of Robust Dynamical Decoupling in Superconducting Qubits
论文作者
论文摘要
动力脱钩是一种保护量子函数免受噪声的技术。在噪声存在下保持量子相干性的能力对于量子设备的开发至关重要。在这里，Rigetti量子计算平台用于测试不同的动态解耦序列。序列的性能以量子过程断层扫描为特征，并使用量子通道形式主义进行分析。结果表明，动态脱钩可以减少量子的脱位，但不能防止自发发射。此外，从过程断层扫描结果中，也可以得出结论，动态脱钩的作用不能理解为对量子相干时间的简单修改。这里还显示，在Rigetti Qubits上动态解耦的性能受到脉冲缺陷的限制。但是，可以使用鲁棒的动力学去耦来提高性能，即对实验缺陷的序列。这里测试的序列优于在同一平台上测试的先前的动态解耦序列。
Dynamical decoupling is a technique that protects qubits against noise. The ability to preserve quantum coherence in the presence of noise is essential for the development of quantum devices. Here the Rigetti quantum computing platform was used to test different dynamical decoupling sequences. The performance of the sequences was characterized by Quantum Process Tomography and analyzed using the quantum channels formalism. It is shown that dynamical decoupling can reduce qubit dephasing but cannot protect against spontaneous emission. Furthermore, from process tomography results, it was also possible to conclude that the action of dynamical decoupling cannot be understood as a simple modification of the qubit coherence time. It is also shown here that the performance of dynamical decoupling on the Rigetti's qubits is limited by pulse imperfections. However, the performance can be improved using robust dynamical decoupling, i.e. sequences that are robust against experimental imperfections. The sequences tested here outperformed previous dynamical decoupling sequences tested in the same platform.
