2019/11/30 by Wen-Long Ma, Mengzhen Zhang, Yat Wong +5 · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.125.110503
published as Phys. Rev. Lett. 125, 110503 (2020) · 6 pages, 2 figures (+15 pages supplement)
arxiv created 2020/08/09 · arxiv updated 2020/09/10
Ancilla systems are often indispensable to universal control of a nearly isolated quantum system. However, ancilla systems are typically more vulnerable to environmental noise, which limits the performance of such ancilla-assisted quantum control. To address this challenge of ancilla-induced decoherence, we propose a general framework that integrates quantum control and quantum error correction, so that we can achieve robust quantum gates resilient to ancilla noise. We introduce the path independence criterion for fault-tolerant quantum gates against ancilla errors. As an example, a path-independent gate is provided for superconducting circuits with a hardware-efficient design.