A photon-pair source with controllable delay based on shaped inhomogeneous broadening of rare-earth doped solids

TL;DR

This paper proposes a method to generate entangled photon pairs with controllable delay using shaped inhomogeneous broadening in rare-earth doped solids, enabling practical quantum communication applications.

Contribution

It introduces a feasible solid-state implementation of photon-pair sources with tunable delay by shaping inhomogeneous broadening, advancing quantum entanglement technology.

Findings

Feasible implementation with current technology

Enables heralded entanglement of remote solids

Provides controllable photon-pair delay

Abstract

Spontaneous Raman emission in atomic gases provides an attractive source of photon pairs with a controllable delay. We show how this technique can be implemented in solid state systems by appropriately shaping the inhomogeneous broadening. Our proposal is eminently feasible with current technology and provides a realistic solution to entangle remote rare-earth doped solids in a heralded way.