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arXiv 1904.06166quant-ph
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量子纠错码的自适应贝叶斯相位估计

Adaptive Bayesian phase estimation for quantum error correcting codes

F. Martínez-García, D. Vodola, M. Müller

摘要:

即使在中小型量子计算机上实现实验,也需要优化几个参数,以实现高保真操作。随着量子寄存器的大小增加,量子态的表征变得更加困难,因为要测量的参数的数量也增加,并且找到有效的可观测量以估计模型的参数成为关键任务。在这里,我们提出了一种依赖于应用贝叶斯推断的方法,可以用来确定系统的,未知的多量子比特状态的相移。与Ramsey型协议相比,该方法提供了重要的优点。首先,应用贝叶斯推断允许选择用于测量的自适应基础,其产生关于状态的相移的最佳信息量。其次,该方法可以同时处理不同观测量的结果。这导致相位估计所需的资源大幅减少,加速了实验实施中的状态表征和优化。所提出的贝叶斯推断方法可以应用于目前用作量子处理器的各种物理平台。

英文摘要:

Realisation of experiments even on small and medium-scale quantum computers requires an optimisation of several parameters to achieve high-fidelity operations. As the size of the quantum register increases, the characterisation of quantum states becomes more difficult since the number of parameters to be measured grows as well and finding efficient observables in order to estimate the parameters of the model becomes a crucial task. Here we propose a method relying on application of Bayesian inference that can be used to determine systematic, unknown phase shifts of multi-qubit states. This method offers important advantages as compared to Ramsey-type protocols. First, application of Bayesian inference allows the selection of an adaptive basis for the measurements which yields the optimal amount of information about the phase shifts of the state. Secondly, this method can process the outcomes of different observables at the same time. This leads to a substantial decrease in the resources needed for the estimation of phases, speeding up the state characterisation and optimisation in experimental implementations. The proposed Bayesian inference method can be applied in various physical platforms that are currently used as quantum processors.

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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