Quantum storage with flat bands

TL;DR

This paper presents a novel method for creating stable, localized quantum states in flat-band lattices using edge-injected waves and localized potentials, validated experimentally in photonic waveguides for quantum storage.

Contribution

Introduces a targeted technique for generating compact localized states in flat-band systems, combining edge excitation and on-site potentials, applicable across various platforms.

Findings

Successful experimental demonstration in photonic waveguides.

Effective creation of stable localized excitations for quantum memory.

Broad applicability to flat-band physics platforms.

Abstract

The realization of robust quantum storage devices relies on the ability to generate long-lived, spatially localized quantum states. In this work, we introduce a method for the targeted creation of compact excitations in flat-band lattices. By injecting in-plane radiation waves from the system's edge and applying a localized on-site potential at the desired storage position, we induce hybridization between compact localized states (CLSs) of the flat-band and resonant dispersive plane waves. This hybridization enables the formation of spatially compact, stable excitations suitable for quantum memory applications. We experimentally validate this mechanism using photonic waveguide arrays, focusing on two representative geometries: the diamond chain and the one-dimensional Lieb ladder. Our approach is broadly applicable to any platform supporting flat-band physics.