Mid-circuit correction of correlated phase errors using an array of spectator qubits

• 成果类型: Article
• 署名作者: Singh, K.; Bradley, C. E.; Anand, S.; Ramesh, V.; White, R.; Bernien, H.
• 署名单位: University of Chicago; University of Chicago; University of Chicago
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9679
• DOI: 10.1126/science.ade5337
• 发表日期: 2023-06-23
• 页码: 1265-1269
• 关键词: quantum; noise

摘要

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, colocated, auxiliary spectator qubits act as in situ probes of noise and enable real-time, coherent corrections of data qubit errors. We used 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 feedforward operations, these correlated errors were 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 feedforward, and coherent mid-circuit reloading of atomic qubits.