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arXiv:1707.07267 · Nature Communications

Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells

Yunfei Pu, Nan Jiang, W. Chang, H-X Yang, Chang Li, L-M Duan

Published May 8, 2017• 176 citations
arXivHTMLPDF

Abstract

To realize long-distance quantum communication and quantum network, it is required to have multiplexed quantum memory with many memory cells. Each memory cell needs to be individually addressable and independently accessible. Here we report an experiment that realizes a multiplexed DLCZ-type quantum memory with 225 individually accessible memory cells in a macroscopic atomic ensemble. As a key element for quantum repeaters, we demonstrate that entanglement with flying optical qubits can be stored into any neighboring memory cells and read out after a programmable time with high fidelity. Experimental realization of a multiplexed quantum memory with many individually accessible memory cells and programmable control of its addressing and readout makes an important step for its application in quantum information technology.

DOI
10.1038/ncomms15359

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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.A millisecond lifetime is achieved for individual memory cells after suppressing the magnetic-field-induced inhomogeneous broadening and the atomic-motioninduced spin-wave dephasing.Based on these long-lived 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.
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