From Non-Markovian Dissipation to Spatiotemporal Control of Quantum Nanodevices

TL;DR

This paper investigates how non-Markovian environmental dynamics influence and can be harnessed for spatiotemporal control in quantum nanodevices, revealing mechanisms for energy transfer and system regulation.

Contribution

It introduces a fully quantum model analyzed with tensor networks to demonstrate environmental control of remote quantum system dynamics and energy harvesting.

Findings

Environmental dynamics can induce and direct remote quantum state evolution.

Energy dissipation into the environment can be remotely harvested for transient states.

Reorganization triggered by excitation can reversibly alter downstream kinetics.

Abstract

Nanodevices exploiting quantum effects are critically important elements of future quantum technologies (QT), but their real-world performance is strongly limited by decoherence arising from local `environmental' interactions. Compounding this, as devices become more complex, i.e. contain multiple functional units, the `local' environments begin to overlap, creating the possibility of environmentally mediated decoherence phenomena on new time-and-length scales. Such complex and inherently non-Markovian dynamics could present a challenge for scaling up QT, but -- on the other hand -- the ability of environments to transfer `signals' and energy might also enable sophisticated spatiotemporal coordination of inter-component processes, as is suggested to happen in biological nanomachines, like enzymes and photosynthetic proteins. Exploiting numerically exact many body methods (tensor networks) we study a fully quantum model that allows us to explore how propagating environmental dynamics can instigate and direct the evolution of spatially remote, non-interacting quantum systems. We demonstrate how energy dissipated into the environment can be remotely harvested to create transient excited/reactive states, and also identify how reorganisation triggered by system excitation can qualitatively and reversibly alter the `downstream' kinetics of a `functional' quantum system. With access to complete system-environment wave functions, we elucidate the microscopic processes underlying these phenomena, providing new insight into how they could be exploited for energy efficient quantum devices.