论文标题
混合量子门可牢固地脱字错误
Robustly decorrelating errors with mixed quantum gates
论文作者
论文摘要
量子操作中的相干错误无处不在。无论是由虚假的环境耦合引起的还是控制场中的错误，此类错误都可以迅速积累并降解量子电路的性能明显超过平均栅极保真度。正如Hastings [1]和Campbell [2]最近所显示的那样，通过用随机的实现集合代替量子门的确定性实现，可以极大地抑制连贯的错误。我们的工作首先重新定义了黑斯廷斯和坎贝尔作为量子最佳控制问题的结果。然后，我们讨论一个凸面计划，旨在提高所得混合量子门的性能，可实现性和鲁棒性。最后，我们在超导量子的量子器上实现了这些混合量子门，并讨论了与相干误差显着减少一致的随机基准测试结果。 [1] M. B. Hastings，《量子信息与计算》 17，488（2017）。 [2] E. Campbell，《物理评论》 A 95，042306（2017）。
Coherent errors in quantum operations are ubiquitous. Whether arising from spurious environmental couplings or errors in control fields, such errors can accumulate rapidly and degrade the performance of a quantum circuit significantly more than an average gate fidelity may indicate. As Hastings [1] and Campbell [2] have recently shown, by replacing the deterministic implementation of a quantum gate with a randomized ensemble of implementations, on can dramatically suppress coherent errors. Our work begins by reformulating the results of Hastings and Campbell as a quantum optimal control problem. We then discuss a family of convex programs designed to improve the performance, implementability, and robustness of the resulting mixed quantum gates. Finally, we implement these mixed quantum gates on a superconducting qubit and discuss randomized benchmarking results consistent with a marked reduction in the coherent error. [1] M. B. Hastings, Quantum Information & Computation 17, 488 (2017). [2] E. Campbell, Physical Review A 95, 042306 (2017).
