# Solid state source of non-classical photon pairs with embedded multimode quantum memory

## TL;DR

This paper presents a solid-state source of correlated photon pairs with embedded multimode quantum memory, demonstrating the storage of multiple temporal modes and advancing quantum network technology.

## Contribution

It introduces a novel solid-state photon pair source with multimode quantum memory, enabling efficient storage and retrieval of quantum correlations in a crystal.

## Key findings

- Demonstrated strong quantum correlations between photon pairs
- Achieved storage of 11 temporal modes in a solid-state quantum memory
- Showed potential for scalable quantum network architectures

## Abstract

The generation and distribution of quantum correlations between photonic qubits is a key resource in quantum information science. For applications in quantum networks and quantum repeaters, it is required that these quantum correlations be stored in a quantum memory. In 2001, Duan, Lukin, Cirac, and Zoller (DLCZ) proposed a scheme combining a correlated photon-pair source and a quantum memory in atomic gases, which has enabled fast progress towards elementary quantum networks. In this letter, we demonstrate a solid state source of correlated photon pairs with embedded spin-wave quantum memory, using a rare-earth doped crystal. We show strong quantum orrelations between the photons, high enough for performing quantum communication. Unlike the original DLCZ proposal, our scheme is inherently multimode thanks to a built-in rephasing mechanism, allowing us to demonstrate storage of 11 temporal modes. These results represent an important step towards the realization of complex quantum networks architectures using solid-state resources.