Strongly coupled slow-light polaritons in one-dimensional disordered localized states

TLDR

Cavity quantum electrodynamics enables coherent control of a single quantum emitter with a highly confined radiation field, offering the prospect of strong coupling for chip‑scale quantum processing, yet this capability has been limited to a few groups due to stringent precision requirements. Our tight‑binding models with quantum impurities describe strong localized polaritons across varying disorder strengths, yielding complementary estimates of pure dephasing and incoherent pumping rates. We observe for the first time coherent polariton states of strongly coupled single quantum‑dot excitons in disordered one‑dimensional localized modes of slow‑light photonic crystals, achieving vacuum Rabi splittings up to 311 μeV and establishing a platform for coherent control, collective interactions, and quantum information processing.

Abstract

Cavity quantum electrodynamics advances the coherent control of a single quantum emitter with a quantized radiation field mode, typically piecewise engineered for the highest finesse and confinement in the cavity field. This enables the possibility of strong coupling for chip-scale quantum processing, but till now is limited to few research groups that can achieve the precision and deterministic requirements for these polariton states. Here we observe for the first time coherent polariton states of strong coupled single quantum dot excitons in inherently disordered one-dimensional localized modes in slow-light photonic crystals. Large vacuum Rabi splittings up to 311 μeV are observed, one of the largest avoided crossings in the solid-state. Our tight-binding models with quantum impurities detail these strong localized polaritons, spanning different disorder strengths, complementary to model-extracted pure dephasing and incoherent pumping rates. Such disorder-induced slow-light polaritons provide a platform towards coherent control, collective interactions, and quantum information processing.