Mid-circuit correction of correlated phase errors using an array of spectator qubits
Mid-circuit correction of correlated phase errors using an array of spectator qubits
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DOI：
10.1126/science.ade5337
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发表时间：
2022-08
期刊：
影响因子：
56.9
通讯作者：
Kevin Singh;C. Bradley;Shraddha Anand;V. Ramesh;Ryan White;H. Bernien
中科院分区：
文献类型：
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作者：
Kevin Singh;C. Bradley;Shraddha Anand;V. Ramesh;Ryan White;H. Bernien
扩大总是容易出错的量子处理器是一个艰巨的挑战。尽管量子纠错最终保证了容错操作，但所需的量子比特开销和错误阈值是令人望而生畏的。在一项补充方案中，并置的辅助“旁观者”量子比特充当噪声的原位探测器，并使数据量子比特错误的实时、连贯校正成为可能。我们使用铯的旁观者量子位阵列来校正相关的位相误差，这些相关的相位误差来自于一组Rb数据量子位。通过结合顺序读出、数据处理和前馈操作，这些相关误差在量子电路的执行中被抑制。该协议广泛适用于量子信息平台，并为中性原子量子处理器的扩展建立了关键工具：原子阵列的中路读出、实时处理和前馈以及原子量子比特的相干中路重载。描述编辑的摘要量子比特是比特的量子信息版本，由于它们与环境的相互作用，容易产生退相干。管理消相干的一种方法是纠正其影响。最近，有人提出了一种方案，即在系统中嵌入所谓的“旁观者”量子比特，并用来读出累积的噪声。然后，这些信息被实时用来对抗执行计算的“数据”量子比特的消相干。Singh等人在放置在光学镊子中的中性原子的两种物种系统中实验地实施了这一提议。研究人员通过减轻注入磁场噪声的影响，展示了这一过程的成功。-Jelena Stajic，一个Cs和Rb原子的散布阵列，用于执行一项纠正相关错误的协议。
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. Description Editor’s summary Qubits, the quantum information version of bits, are prone to decoherence as a consequence of their interaction with the environment. One way to manage decoherence is to correct for its effects. Recently, a scheme was proposed in which so-called “spectator” qubits are embedded in the system and used to read out the accumulated noise. This information is then used in real time to counter the decoherence of the “data” qubits that are performing the computation. Singh et al. implemented this proposal experimentally in a two-species system of neutral atoms placed in optical tweezers. The researchers demonstrated the success of the procedure by mitigating the effects of injected magnetic field noise. —Jelena Stajic An interspersed array of Cs and Rb atoms was used to implement a protocol for the correction of correlated errors.