AI 中文总结
本文针对0-π等受保护超导量子比特的测量难题，提出在两个正交基下执行受保护测量的方案，利用量子非破坏特性容忍辅助量子比特故障，为容错通用控制提供关键技术。
AI 中文摘要
0-π量子比特等受保护超导量子比特有望大幅抑制错误率，用更少的量子比特实现容错量子计算。测量这类量子比特颇具挑战，因其受保护特性，目前尚无不破坏其保护的具体测量方案。本文展示如何在两个正交基下对0-π量子比特执行受保护测量，该测量的保护由其量子非破坏特性实现，可容忍辅助测量量子比特的故障。随着实验进展推动受保护量子比特进入更低错误率区域，本文技术对容错通用控制至关重要。
英文摘要
Protected superconducting qubits such as the $0$-$π$ qubit promise to substantially suppress error rates, facilitating fault-tolerant quantum computing with fewer qubits. Measuring these qubits is challenging due to their protected nature, and thus far no concrete proposal exists for how to measure them without breaking their protection. Here we show how to perform protected measurements of the $0$-$π$ qubit in two orthogonal bases. The protection of these measurements is facilitated by their quantum non-demolition nature, allowing faults on ancillary measurement qubits to be tolerated. As experimental progress pushes protected qubits further into the low error-rate regime, our techniques will be crucial for fault-tolerant universal control.
Comments5 pages + 20 page appendix, 3 + 7 figures, comments welcome
