Active Control of Probability Amplitudes in a Mesoscale System via Feedback-Induced Suppression of Dissipation and Noise

TL;DR

This paper presents a feedback mechanism that reduces dissipation and noise in quantum systems, maintaining coherence and enabling better control over electronic excitation transfer processes.

Contribution

It introduces a classical feedback approach to suppress environmental dissipation in quantum systems, preserving interference and spectral coherence during excitation transfer.

Findings

Feedback reduces dissipation in quantum systems.

Spectral coherence is maintained through negative feedback.

Decoupled vibronic channels serve as probes for system characterization.

Abstract

We introduce a classical potentiostatic feedback mechanism that attenuates the dissipation in a quantum system arising from coupling to the surrounding thermodynamic bath, preserving the inter-state interference in an electronic excitation transfer (EET) process. A three-terminal potentiostat device applies a low-noise voltage bias to the terminals of the EET system and reduces the physical coupling between the quantum system and its environment. We introduce a classical equivalent circuit to model the environment-coupled excitation transfer in an elementary two-state system. This model provides qualitative insight into how classical feedback action affects the transition probabilities between the states and selectively reduces the dissipative coupling for one of the vibronic energy levels of the transfer system. Furthermore, we show that negative feedback results in persistent spectral coherence between the energy level of the decoupled state and the vibronic levels of the complementary state, making the decoupled vibronic channel a probe for characterizing the vibronic structure of the complementary channel of the EET system.