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arXiv 2004.05408quant-phcond-mat.mes-hall
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非互易量子点电路的耗散工程:一种输入-输出方法

Dissipation-engineering of nonreciprocal quantum dot circuits: An input-output approach

Junjie Liu, Dvira Segal

摘要:

纳米电子器件中的非互易效应为操纵电子输运和工程量子电子电路提供了独特的可能性。然而,缺乏严格的理论工具阻碍了这一发展。在这里,我们提供了一个通用的输入输出描述的非互易传输在固态量子点架构,基于量子光力学模拟。特别是,我们打破相干耦合量子点之间的相互作用耗散工程,其中这些(所谓的)主要点相互耦合到辅助,阻尼量子点。我们说明了两个有代表性的多端非相互作用的模型,它可以被用来作为构建块较大的电路的一般框架。重要的是,确定的非互易行为的最佳条件,即使在存在额外的耗散效应,导致当地的电子-声子耦合。除了散射矩阵的分析,我们表明,非互易耦合诱导单向电子流的共振传输制度。总之,我们的分析提供了实现非互易纳米电子器件的形式主义和工作原理。

英文摘要:

Nonreciprocal effects in nanoelectronic devices offer unique possibilities for manipulating electron transport and engineering quantum electronic circuits for information processing purposes. However, a lack of rigorous theoretical tools is hindering this development. Here, we provide a general input-output description of nonreciprocal transport in solid-state quantum dot architectures, based on quantum optomechanical analogs. In particular, we break reciprocity between coherently-coupled quantum dots by dissipation-engineering in which these (so-called) primary dots are mutually coupled to auxiliary, damped quantum dots. We illustrate the general framework in two representative multiterminal noninteracting models, which can be used as building blocks for larger circuits. Importantly, the identified optimal conditions for nonreciprocal behavior hold even in the presence of additional dissipative effects that result from local electron-phonon couplings. Besides the analysis of the scattering matrix, we show that a nonreciprocal coupling induces unidirectional electron flow in the resonant transport regime. Altogether, our analysis provides the formalism and working principles towards the realization of nonreciprocal nanoelectronic devices.

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