Experimental entanglement of 25 individually accessible atomic quantum interfaces

TL;DR

This paper demonstrates the experimental creation of multipartite entanglement among 25 atomic quantum interfaces, advancing quantum network development and long-distance quantum communication capabilities.

Contribution

It reports the first experimental entanglement of 25 atomic quantum interfaces, a significant step towards scalable quantum networks.

Findings

Entangled 25 atomic quantum interfaces in a multiplexed array.

Confirmed genuine 22-partite entanglement among the interfaces.

Achieved record-high number of entangled quantum interfaces.

Abstract

Quantum interface links stationary qubits in quantum memory with flying photonic qubits in optical transmission channels and constitutes a critical element for future quantum internet. Entanglement of quantum interfaces is a key step for realization of quantum networks. Through heralded detection of photon interference, here we generate multipartite entanglement between 25 (or 9) individually addressable quantum interfaces in a multiplexed atomic quantum memory array and confirm genuine 22 (or 9) partite entanglement, respectively. Experimental entanglement of a record-high number of quantum interfaces makes an important enabling step towards realization of quantum networks, long-distance quantum communication, and multipartite quantum information processing.