# Generating maximal entanglement between spectrally distinct solid-state emitters

## TL;DR

This paper presents a method to generate maximal entanglement between spectrally distinct solid-state emitters using multi-photon scattering, relaxing the need for identical emitters by optimizing optical states.

## Contribution

It introduces a novel approach to entangle non-identical solid-state emitters through multi-photon scattering and identifies optimal conditions for entanglement generation.

## Key findings

- Deterministic maximal entanglement achievable with spectrally distinct emitters.
- Higher photon numbers can overcome spectral mismatch.
- Quasi-monochromatic photons are optimal for entanglement.

## Abstract

We show how to create maximal entanglement between spectrally distinct solid-state emitters embedded in a waveguide interferometer. By revealing the rich underlying structure of multi-photon scattering in emitters, we show that a two-photon input state can generate deterministic maximal entanglement even for emitters with significantly different transition energies and line-widths. The optimal frequency of the input is determined by two competing processes: which-path erasure and interaction strength. We find that smaller spectral overlap can be overcome with higher photon numbers, and quasi-monochromatic photons are optimal for entanglement generation. Our work provides a new methodology for solid-state entanglement generation, where the requirement for perfectly matched emitters can be relaxed in favour of optical state optimisation.