Coupling Remote States through the Continuum: Multi-State Fano Resonances

TL;DR

This paper demonstrates a tunable multi-state Fano system where remotely-implemented quantum states interact via a shared continuum, revealing how the continuum can mediate quantum state coupling rather than cause decoherence.

Contribution

It introduces a novel multi-state Fano resonance system showing continuum-mediated interactions, enabling new ways to engineer collective states in nanostructures.

Findings

Observation of robust avoided crossings near resonance coincidence

Confirmation that the continuum mediates quantum state interactions

Potential for engineering collective states in nanostructures

Abstract

We demonstrate a fully-tunable multi-state Fano system in which remotely-implemented quantum states interfere with each other through their coupling to a mutual continuum. On tuning these resonances near coincidence a robust avoided crossing is observed, with a distinctive character that confirms the continuum as the source of the coupling. While the continuum often serves as a source of decoherence, our work therefore shows how its presence can instead also be essential to mediate the interaction of quantum states, a result that could allow new approaches to engineer the collective states of nanostructures.