Environment-assisted quantum transport in ordered systems
Environment-assisted quantum transport in ordered systems
复制标题
有序系统中的环境辅助量子传输
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
A. Aspuru‐Guzik
中科院分区：
文献类型：
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作者：
I. Kassal;A. Aspuru‐Guzik
当量子时间演化和退相干共同产生比纯量子或纯经典情况下更高的输运效率时，量子系统中的噪声辅助输运就会发生。在无序系统中，它被理解为通过噪声抑制相干量子局域化，使失谐量子能级进入共振，从而促进传输。我们报告了几种有序系统中环境辅助传输的新机制，其中没有需要克服的局部化，并且人们会天真地期望相干传输是最快的。虽然我们特别希望了解光合作用光收集复合体中的激子能量转移，但我们的模型是具有脱相，源和捕获的紧密结合系统中的一般传输-可以期望有更广泛的应用。
Noise-assisted transport in quantum systems occurs when quantum time evolution and decoherence conspire to produce a transport efficiency that is higher than what would be seen in either the purely quantum or purely classical cases. In disordered systems, it has been understood as the suppression of coherent quantum localization through noise, which brings detuned quantum levels into resonance and thus facilitates transport. We report several new mechanisms of environment-assisted transport in ordered systems, in which there is no localization to overcome and where one would naively expect that coherent transport is the fastest possible. Although we are particularly motivated by the need to understand excitonic energy transfer in photosynthetic light-harvesting complexes, our model is general—transport in a tight-binding system with dephasing, a source and a trap—and can be expected to have wider application.