Multicell Atomic Quantum Memory as a Hardware-Efficient Quantum Repeater Node

Abstract

For scalable quantum communication and networks, a key step is to realize a quantum repeater node that can efficiently connect different segments of atom-photon entanglement using quantum memories. We report a compact and hardware-efficient realization of a quantum repeater node using a single atomic ensemble for multicell quantum memories. Millisecond lifetime is achieved for individual memory cells after suppressing the magnetic-field-induced inhomogeneous broadening and the atomic-motion-induced spin-wave dephasing. Based on these long-lived multicell memory cells, we achieve heralded asynchronous entanglement generation in two quantum repeater segments one after another and then an on-demand entanglement connection of these two repeater segments. As another application of the multicell atomic quantum memory, we further demonstrate storage and on-demand retrieval of heralded atomic spin-wave qubits by implementing a random access quantum memory with individual addressing capacity. This work provides a promising constituent for efficient realization of quantum repeaters for large-scale quantum networks.

8 pages, 6 figures

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Cited by in corpus (7)

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• A solid-state temporally multiplexed quantum memory array at the single-photon level
• Multiplexed random-access optical memory in warm cesium vapor
• Quantum Interference in Atomic Systems
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• Robust entanglement buffers based on SWAP interactions