论文标题
通过纠缠量他的动态解耦学习噪音
Learning Noise via Dynamical Decoupling of Entangled Qubits
论文作者
论文摘要
由于涉及多个自由度的多体效应，纠缠量子系统中的噪声很难表征。这种噪声对量子计算构成了一个挑战，其中两分门的性能至关重要。在这里，我们开发并应用了多Qubit动力学脱钩序列，这些序列表征了在两倍大门期间发生的噪声。在我们的超导系统由带有可调耦合器的Transmon Qubit组成的超导系统中，我们观察到与耦合器中的通量波动一致的噪声，这些噪声同时影响了Qubits并在其纠缠参数中引起噪声。这种噪声对Qubits的影响与研究良好的单Quithasing截然不同。此外，在解耦信号中观察到步骤，这意味着存在非高斯噪声。
Noise in entangled quantum systems is difficult to characterize due to many-body effects involving multiple degrees of freedom. This noise poses a challenge to quantum computing, where two-qubit gate performance is critical. Here, we develop and apply multi-qubit dynamical decoupling sequences that characterize noise that occurs during two-qubit gates. In our superconducting system comprised of Transmon qubits with tunable couplers, we observe noise that is consistent with flux fluctuations in the coupler that simultaneously affects both qubits and induces noise in their entangling parameter. The effect of this noise on the qubits is very different from the well-studied single-qubit dephasing. Additionally, steps are observed in the decoupled signals, implying the presence of non-Gaussian noise.
