Efficient in-situ generation of photon-memory entanglement in a nonlinear cavity

TL;DR

This paper presents a novel in-situ method for generating high-rate photon-memory entanglement using a nonlinear cavity coupled with a quantum memory, promising significant improvements for quantum networking.

Contribution

The authors introduce a parametric driving scheme in a nonlinear cavity that enables efficient, high-rate photon-memory entanglement generation without fine-tuning, surpassing existing protocols.

Findings

Achieves entanglement rates of tens of MHz.

Operates effectively with existing photonic and quantum memory technologies.

Supports multimode entanglement and discards one optical mode without loss.

Abstract

Parametrically driving an optical cavity that simultaneously couples to an atomic ensemble quantum memory enables in-situ generation of multimode photon-memory entanglement. A high-rate bi-party photon-memory entanglement can be generated even after discarding one entangled optical mode. This protocol can be realized with existing technologies based on photonic resonators integrated with a rare-earth-ion doped quantum memory. The proposed scheme shows significant advantages in entanglement generation rates compared with prevailing quantum memory protocols and experiments, with theoretical Ebit rates of tens of MHz without fine-tuned operating conditions. Such a photon-memory entanglement source offers a versatile resource for quantum networking and interconnect applications.