The sources, which generate atom-photon quantum correlations or entanglement based on quantum memory, are basic blocks for building quantum repeaters (QRs). For achieving highly entanglement-generation rates in ensemble-based QRs, spatial-, temporal- and spectral-multimode memories are needed. The previous temporal-multimode memories are based on rephrasing mechanisms in inhomogeneous-broadened media. Here, by applying a train of multi-direction write pulses into a homogeneous-broadened atomic ensemble to induce Duan-Lukin-Cirac-Zoller-like Raman processes, we prepare up to 19 pairs of modes, namely, a spin-wave mode and a photonic time bin. Spin-wave-photon (i.e., atom-photon) entanglement is probabilistically produced in the mode pairs. As a proof-in-principle demonstration, we show that the multiplexed source using all the spin-wave modes and feed-forward-control readout increases spin-wave-photon entanglement generation rate by a factor of ∼18.3, compared to non-multiplexed source using the individual modes. The measured Bell parameter for the multiplexed source is 2.30±0.02 combined with a memory lifetime of 30μs.
@article{arxiv.1810.06143,
title = {Multiplexed spin-wave-photon entanglement source using temporal-multimode memories and feedforward-controlled readout},
author = {Yafei Wen and Pai Zhou and Zhongxiao Xu and Liang Yuan and Haoyi Zhang and Shengzhi Wang and Long Tian and Shujing Li and Hai Wang},
journal= {arXiv preprint arXiv:1810.06143},
year = {2019}
}