Scaling up invariably error-prone quantum processors is a formidable challenge. Although quantum error correction ultimately promises fault-tolerant operation, the required qubit overhead and error thresholds are daunting. In a complementary proposal, co-located, auxiliary ‘spectator’ qubits act as in-situ probes of noise, and enable real-time, coherent corrections of data qubit errors. We use an array of cesium spectator qubits to correct correlated phase errors on an array of rubidium data qubits. By combining in-sequence readout, data processing, and feed-forward operations, these correlated errors are suppressed within the execution of the quantum circuit. The protocol is broadly applicable to quantum information platforms, and establishes key tools for scaling neutral-atom quantum processors: mid-circuit readout of atom arrays, real-time processing and feed-forward, and coherent mid-circuit reloading of atomic qubits.

中文翻译：

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使用观察量子位阵列对相关相位误差进行中电路校正

扩展总是容易出错的量子处理器是一项艰巨的挑战。尽管量子纠错最终保证了容错操作，但所需的量子位开销和错误阈值令人望而生畏。在一项补充提案中，位于同一位置的辅助“旁观者”量子位充当噪声的原位探针，并能够对数据量子位错误进行实时、相干的校正。我们使用铯观察者量子位阵列来纠正铷数据量子位阵列上的相关相位误差。通过结合顺序读出、数据处理和前馈操作，这些相关错误在量子电路的执行过程中被抑制。该协议广泛适用于量子信息平台，并建立了扩展中性原子量子处理器的关键工具：原子阵列的中电路读出，