论文标题
有效提高嘈杂量子计算机的性能
Efficiently improving the performance of noisy quantum computers
论文作者
论文摘要
使用近期量子计算机来实现量子优势，需要有效的策略来提高目前可用的嘈杂量子设备的性能。我们开发并实验验证了两个有效的误差缓解协议，称为“无噪声输出外推”和“取消保利误差”，这些方案可以大大增强由门的嘈杂循环组成的量子电路的性能。通过结合流行的缓解策略，例如概率误差取消和噪声放大与有效的噪声重建方法，我们的协议可以减轻不满足现有缓解协议的假设的广泛噪声过程，包括非局部和栅极依赖性过程。我们在高级量子测试台处的四Q量超导处理器上测试我们的协议。我们观察到结构化电路和随机电路的性能有显着改善，在未固定输出中，变化距离的$ 86 \％$提高。我们的实验证明了我们的协议的有效性以及它们对当前硬件平台的实用性。
Using near-term quantum computers to achieve a quantum advantage requires efficient strategies to improve the performance of the noisy quantum devices presently available. We develop and experimentally validate two efficient error mitigation protocols named "Noiseless Output Extrapolation" and "Pauli Error Cancellation" that can drastically enhance the performance of quantum circuits composed of noisy cycles of gates. By combining popular mitigation strategies such as probabilistic error cancellation and noise amplification with efficient noise reconstruction methods, our protocols can mitigate a wide range of noise processes that do not satisfy the assumptions underlying existing mitigation protocols, including non-local and gate-dependent processes. We test our protocols on a four-qubit superconducting processor at the Advanced Quantum Testbed. We observe significant improvements in the performance of both structured and random circuits, with up to $86\%$ improvement in variation distance over the unmitigated outputs. Our experiments demonstrate the effectiveness of our protocols, as well as their practicality for current hardware platforms.
