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arXiv 2103.02385quant-ph
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关联噪声下量子过程的滤波函数

Filter Functions for Quantum Processes under Correlated Noise

Pascal Cerfontaine, Tobias Hangleiter, Hendrik Bluhm

摘要:

许多量子比特的实现受到相关噪声的困扰,这些噪声不能被基于马尔可夫近似的标准理论工具捕获。虽然独立门操作是量子计算的关键概念,但如果噪声在比其持续时间更长的时间上相关,则实际上不可能在时间上局部地完全描述噪声门。为了解决这个问题,我们开发了一种方法的基础上的过滤函数形式主义微扰计算量子过程中存在的相关经典噪声。我们推导出一个组合规则的过滤器功能的一系列的门在那些个别的门。联合滤波器函数允许有效地计算整个序列的量子过程。此外,我们发现,相关项出现捕获的级联的影响,从而产生洞察噪声相关门序列的效果。我们的滤波器函数形式主义的推广,使定性和定量的算法和国家的最先进的工具,广泛用于实验验证门的性能,如随机基准测试,即使在存在噪声相关性的研究。

英文摘要:

Many qubit implementations are afflicted by correlated noise not captured by standard theoretical tools that are based on Markov approximations. While independent gate operations are a key concept for quantum computing, it is actually not possible to fully describe noisy gates locally in time if noise is correlated on times longer than their duration. To address this issue, we develop a method based on the filter function formalism to perturbatively compute quantum processes in the presence of correlated classical noise. We derive a composition rule for the filter function of a sequence of gates in terms of those of the individual gates. The joint filter function allows to efficiently compute the quantum process of the whole sequence. Moreover, we show that correlation terms arise which capture the effects of the concatenation and thus yield insight into the effect of noise correlations on gate sequences. Our generalization of the filter function formalism enables both qualitative and quantitative studies of algorithms and state-of-the-art tools widely used for the experimental verification of gate fidelities like randomized benchmarking, even in the presence of noise correlations.

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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