arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.02196quant-ph
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量子噪声对量子近似优化算法的影响

Effects of Quantum Noise on Quantum Approximate Optimization Algorithm

Cheng Xue, Zhao-Yun Chen, Yu-Chun Wu, Guo-Ping Guo

摘要:

量子-经典混合算法是一种有望在NISQ器件中展示量子优势的算法。当运行这样的算法时,来自量子噪声的影响是不可避免的。在我们的工作中,我们考虑一个著名的混合算法,量子近似优化算法(QAOA)。我们研究了典型量子噪声信道对QAOA的影响,并给出了一些数值结果。我们的研究表明,从QAOA得到的输出状态保真度,成本函数,其梯度下降指数的门的数量和噪声强度。此外,我们还发现噪声只是对参数空间的扰动,并没有改变参数空间的结构,因此优化后的参数不会偏离理想值。我们的研究结果为NISQ设备上运行的混合算法的有效性提供了证据。

英文摘要:

The quantum-classical hybrid algorithm is an algorithm that holds promise in demonstrating the quantum advantage in NISQ devices. When running such algorithms, effects from quantum noise are inevitable. In our work, we consider a well-known hybrid algorithm, the quantum approximate optimization algorithm (QAOA). We study the effects on QAOA from typical quantum noise channels and produce several numerical results. Our research indicates that the output state fidelity, the cost function, and its gradient obtained from QAOA decrease exponentially with respect to the number of gates and noise strength. Moreover, we find that noise merely flattens the parameter space without changing its structure, so optimized parameters will not deviate from their ideal values. Our result provides evidence for the effectiveness of hybrid algorithms running on NISQ devices.

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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