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arXiv 2008.05944hep-th
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相互作用理论的微扰复杂性

Perturbative Complexity of Interacting Theory

Wung-Hong Huang

摘要:

本文提出了一种系统的方法,将相互作用理论的量子复杂性展开为耦合常数的级数。计算复杂度时采用算符法,其中参考态和目标态的二次量子化算符之间的变换矩阵定义了量子门。我们从两个耦合振子出发,微扰地计算了门矩阵的相关群流形的测地线长度。接下来,我们将分析推广到描述晶格$λϕ^4$理论的$N$耦合振子。特别地,我们引入简单的图来表示微扰级数,并构造简单的规则来有效地计算复杂度。得到了计算激发态高阶复杂度的一般公式。我们提出了几个图表来阐明复杂性的属性,并表明复杂性的相互作用校正可能是正的或负的,这取决于参考状态频率的大小。

英文摘要:

We present a systematic method to expand the quantum complexity of interacting theory in series of coupling constant. The complexity is evaluated by the operator approach in which the transformation matrix between the second quantization operators of reference state and the target state defines the quantum gate. We start with two coupled oscillators and perturbatively evaluate the geodesic length of the associated group manifold of gate matrix. Next, we generalize the analysis to $N$ coupled oscillators which describes the lattice $λϕ^4$ theory. Especially, we introduce simple diagrams to represent the perturbative series and construct simple rules to efficiently calculate the complexity. General formulae are obtained for the higher-order complexity of excited states. We present several diagrams to illuminate the properties of complexity and show that the interaction correction to complexity may be positive or negative depending on the magnitude of reference-state frequency.

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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