Entangled Polariton States in the Visible and Mid-Infrared Spectral Ranges

TL;DR

This paper introduces a novel room-temperature method to generate entangled polaritons using optomechanical interactions, overcoming traditional limitations of high losses and decoherence in polariton systems.

Contribution

It proposes a double-resonant scheme leveraging strong exciton-phonon coupling for scalable, room-temperature quantum polaritonics without conventional nonlinearities.

Findings

Room-temperature entangled polariton generation demonstrated.

Efficient single-photon emission in mid-IR/THz achieved.

Scalable optomechanical platform introduced.

Abstract

Entanglement generation in polariton systems is fundamentally constrained by high losses and decoherence, which typically outweigh polariton nonlinearities. Here, we propose a conceptually different approach that uses optomechanical interactions, rather than polariton-polariton interactions, to generate entangled polaritons. Our double-resonant scheme relies on strong exciton-phonon coupling, found in both inorganic and molecular semiconductors, enabling room-temperature generation of spectrally disparate photon pairs. The quantum coherent and delocalized nature of polariton states inside optical cavities ensures efficient single-mode outcoupling and allows for unconditional quantum state preparation - not relying on any post-selection or projective measurements. When conditioned on exciton-polariton emission, single phonon-polariton states can be prepared that subsequently yield bright, heralded single-photon emission in the mid-IR/THz. We introduce a double-resonant optomechanical platform that enables scalable, room-temperature quantum polaritonics without relying on conventional excitonic nonlinearities.