离域量子态的对称增强超转移
Symmetry-enhanced supertransfer of delocalized quantum states
摘要：
激发的相干跳跃依赖于物理扩展态上的量子相干性。在这项工作中，我们考虑简单的模型来研究离域多激发态的对称性对动力学时间尺度的影响，包括跳跃率，辐射衰减和环境相互作用。虽然在N个站点的扩展状态的退相干（纯移相）率是可比的非扩展状态，超辐射导致衰减和吸收率的N增强的一个因素。除了superradiance，我们说明了如何多激子状态表现出“supertransfer”在远场制度：跳跃从一个对称化的状态超过N个网站的对称化的状态超过M网站的速率成正比MN。我们认为，这种对称性可以发挥作用的基础上的竞争增强的相互作用和本地化的不均匀性和环境相互作用，破坏对称性的物理系统中的操作。作为一个例子，我们建议，超传输和相干跳跃发挥作用，在最近的观察异常长的扩散长度在纳米工程组装的捕光复合物。
英文摘要：
Coherent hopping of excitation rely on quantum coherence over physically extended states. In this work, we consider simple models to examine the effect of symmetries of delocalized multi-excitation states on the dynamical timescales, including hopping rates, radiative decay, and environmental interactions. While the decoherence (pure dephasing) rate of an extended state over N sites is comparable to that of a non-extended state, superradiance leads to a factor of N enhancement in decay and absorption rates. In addition to superradiance, we illustrate how the multi-excitonic states exhibit `supertransfer' in the far-field regime: hopping from a symmetrized state over N sites to a symmetrized state over M sites at a rate proportional to MN. We argue that such symmetries could play an operational role in physical systems based on the competition between symmetry-enhanced interactions and localized inhomogeneities and environmental interactions that destroy symmetry. As an example, we propose that supertransfer and coherent hopping play a role in recent observations of anomolously long diffusion lengths in nano-engineered assembly of light-harvesting complexes.
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