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arXiv 2005.12820quant-phcs.ET
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实时量子线路传输降低噪声

Just-in-time Quantum Circuit Transpilation Reduces Noise

Ellis Wilson, Sudhakar Singh, Frank Mueller

摘要:

运行量子程序在当今嘈杂的中间尺度量子(NISQ)设备上充满了挑战。这些挑战中的许多都源于测量过程中的快速退相干和噪声、量子位连接、串扰、量子位本身以及通过门进行的量子位状态转换所导致的误差特性。量子比特不仅不是“生而平等”的,而且它们的噪声水平也会随着时间的推移而变化。据说IBM每天校准他们的量子系统一次,并在校准时报告噪声水平(错误)。这些信息随后用于将电路映射到更高质量的量子位和连接,直到下一个校准点。这项工作提供的证据表明,在这个每日校准周期中还有改进的余地。它提供了一种在执行一个或多个敏感电路之前立即测量与量子位相关的噪声水平(错误)的技术,并表明及时的噪声测量有利于后期的物理量子位映射。通过这种即时重新校准的编译,结果的保真度比IBM的默认映射(仅使用每日校准)有所提高。该框架评估了两个主要的噪声源,即读出误差(测量误差)和两个量子位门/连接误差。实验表明,电路结果的准确性提高了3-304%,平均和高达400%的飞行电路映射的基础上错误测量之前,应用程序执行。

英文摘要:

Running quantum programs is fraught with challenges on on today's noisy intermediate scale quantum (NISQ) devices. Many of these challenges originate from the error characteristics that stem from rapid decoherence and noise during measurement, qubit connections, crosstalk, the qubits themselves, and transformations of qubit state via gates. Not only are qubits not "created equal", but their noise level also changes over time. IBM is said to calibrate their quantum systems once per day and reports noise levels (errors) at the time of such calibration. This information is subsequently used to map circuits to higher quality qubits and connections up to the next calibration point. This work provides evidence that there is room for improvement over this daily calibration cycle. It contributes a technique to measure noise levels (errors) related to qubits immediately before executing one or more sensitive circuits and shows that just-in-time noise measurements benefit late physical qubit mappings. With this just-in-time recalibrated transpilation, the fidelity of results is improved over IBM's default mappings, which only uses their daily calibrations. The framework assess two major sources of noise, namely readout errors (measurement errors) and two-qubit gate/connection errors. Experiments indicate that the accuracy of circuit results improves by 3-304% on average and up to 400% with on-the-fly circuit mappings based on error measurements just prior to application execution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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