Experimental entanglement of 25 individually accessible atomic 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.

11 pages, 5 figures

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• The Quantum Internet
• Entanglement detection
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• Design and Experimental Performance of Local Entanglement Witness Operators
• Scalable generation and detection of on-demand W states in nanophotonic circuits
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• Nonlocal Variable-Strength Measurements of N Qubits Using GHZ-like Entanglement