| Outline of Final Research Achievements |
This research aimed to bridge the gap between the theoretical findings of the previous project, "Fluctuations of information, heat, and charge currents" (17K05575), and experimental studies. The following achievements were made during the research period: Firstly, a general expression describing heat flow and information flow in Bosonic quantum transport was derived. This expression can provide the maximum communication capacity of superconducting quantum transmission lines. Additionally, the relationship between the partition function and the water-filling theorem was established in the wave-like regime. Secondly, fundamental limits of time evolution in open quantum systems were explored. The study identified the principle limitations of the thermodynamic cost associated with transformations of quantum state weakly coupled to an environment. The results have potential applications in superconducting on-chip thermometers, bolometers, and single-electron turnstile devices.
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