Enhancing quantum computation via superposition of quantum gates
Enhancing quantum computation via superposition of quantum gates
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DOI：
10.1103/physreva.108.062604
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发表时间：
2023-04
影响因子：
2.9
通讯作者：
J. Miguel-Ramiro;Zheng Shi;Luca Dellantonio;Albie Chan;C. Muschik;Wolfgang Dür
中科院分区：
文献类型：
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作者：
J. Miguel-Ramiro;Zheng Shi;Luca Dellantonio;Albie Chan;C. Muschik;Wolfgang Dür
克服量子器件中噪声和缺陷的影响是可行的量子应用的主要挑战之一。在本文中，我们提出了不同的协议，我们将其称为“叠加量子误差缓解”，通过在相干叠加中执行它们来增强单个门或整个计算的保真度。我们的结果表明，通过我们的方法，可以在大多数类型的退相干和标准实验参数制度下实现显著的噪声抑制。我们的协议可以是确定性的，这样的结果永远不会被后选择，或者是概率性的，在这种情况下，结果状态必须被丢弃，除非满足一个明确规定的条件。通过使用足够多的资源并在广泛的假设下工作，我们的方法可以产生具有单位保真度的期望输出状态。最后，我们分析了基于门的、基于测量的和基于干涉测量的模型，证明了它们在所有情况下的适用性，并研究了它们所依赖的基本机制。
Overcoming the influence of noise and imperfections in quantum devices is one of the main challenges for viable quantum applications. In this article, we present different protocols, which we denote as"superposed quantum error mitigation", that enhance the fidelity of single gates or entire computations by performing them in coherent superposition. Our results demonstrate that via our methods, significant noise suppression can be achieved for most kinds of decoherence and standard experimental parameter regimes. Our protocols can be either deterministic, such that the outcome is never post-selected, or probabilistic, in which case the resulting state must be discarded unless a well-specified condition is met. By using sufficiently many resources and working under broad assumptions, our methods can yield the desired output state with unit fidelity. Finally, we analyze our approach for gate-based, measurement-based and interferometric-based models, demonstrating the applicability in all cases and investigating the fundamental mechanisms they rely upon.