论文标题
IBM量子体验中的噪声缓解效果延迟脉冲
Noise Mitigation with Delay Pulses in the IBM Quantum Experience
论文作者
论文摘要
当前量子计算硬件的最大挑战之一是如何从嘈杂的设备获得可靠的结果。最近的论文[A。 Kandala等人，Nature 567，491（2019）]描述了一种通过拉伸栅极时间来注入噪声的方法，从而可以计算量子期望值作为IBM-Q设备中噪声量的函数。推断至零噪声导致与确切结果的极好一致。这里描述了一种替代方案，该方案采用了有意添加身份脉冲，并定期暂停设备，以逐渐使量子计算逐渐增加噪声水平。该方案是在IBM-Q设备上的一个Qubit电路中实现的。确定这是控制噪声的有效方法，此外，使用嘈杂的结果进行外推可以导致最终输出的改善，前提是对如何进行外推的谨慎关注。
One of the greatest challenges for current quantum computing hardware is how to obtain reliable results from noisy devices. A recent paper [A. Kandala et al., Nature 567, 491 (2019)] described a method for injecting noise by stretching gate times, enabling the calculation of quantum expectation values as a function of the amount of noise in the IBM-Q devices. Extrapolating to zero noise led to excellent agreement with exact results. Here an alternative scheme is described that employs the intentional addition of identity pulses, pausing the device periodically in order to gradually subject the quantum computation to increased levels of noise. The scheme is implemented in a one qubit circuit on an IBM-Q device. It is determined that this is an effective method for controlled addition of noise, and further, that using noisy results to perform extrapolation can lead to improvements in the final output, provided careful attention is paid to how the extrapolation is carried out.
