Effects of disorder and interactions in environment assisted quantum transport
Effects of disorder and interactions in environment assisted quantum transport
复制标题
环境辅助量子传输中无序和相互作用的影响
作者：
Elinor Zerah;Y. Dubi
理解无序、环境和相互作用之间的相互作用是阐明开放量子系统传输特性的关键，从光合网络中的激子到离子阱中的量子位。这种相互作用在这里理论上研究的背景下，环境辅助量子传输（ENAQT），在开放系统中的一个独特的情况下，环境诱导的退相可以，反直觉，增强运输。首先，我们展示了一个令人惊讶的情况，粒子电流随着无序度的增加而增长，即使没有失相。然后，我们提出了一个具体的机制ENAQT（我们称之为人口均匀化），并证明它可以解释的持久性ENAQT深入到无序诱导的本地化制度。最后，我们表明，排斥相互作用是有害的ENAQT，并导致环境阻碍的量子输运。我们的预测可以很容易地在粒子流实验能力的范围内进行测试。
Understanding the interplay between disorder, environment and interactions is key to elucidating the transport properties of open quantum systems, from excitons in photosynthetic networks to qubits in ion traps. This interplay is studied here theoretically in the context of environment-assisted quantum transport (ENAQT), a unique situation in open system where an environment-induced dephasing can, counter-intuitively, enhance transport. First, we show a surprising situation where the particle current grows with increasing disorder, even without dephasing. Then, we suggest a specific mechanism for ENAQT (which we dub population uniformization) and demonstrate that it can explain the persistence of ENAQT deep into the disorder-induced localization regime. Finally, we show that repulsive interactions are detrimental to ENAQT, and lead to an environment-hampered quantum transport. Our predictions can readily be tested within the scope of particle current experimental capabilities.