Entanglement between a single photon and a quantum memory forms the building blocks for quantum repeater and quantum network. Previous entanglement sources are typically with low retrieval efficiency, which limits future larger-scale applications. Here, we report a source of highly retrievable spinwave-photon entanglement. Polarization entanglement is created through interaction of a single photon with ensemble of atoms inside a low-finesse ring cavity. The cavity is engineered to be resonant for dual spinwave modes, which thus enables efficient retrieval of the spinwave qubit. An intrinsic retrieval efficiency up to 76(4)% has been observed. Such a highly retrievable atom-photon entanglement source will be very useful in future larger-scale quantum repeater and quantum network applications.
@article{arxiv.1505.00405,
title = {Highly Retrievable Spinwave-Photon Entanglement Source},
author = {Sheng-Jun Yang and Xu-Jie Wang and Jun Li and Jun Rui and Xiao-Hui Bao and Jian-Wei Pan},
journal= {arXiv preprint arXiv:1505.00405},
year = {2015}
}