By coupling a Λ-type quantum emitter to a chiral waveguide, in which the polarization of a photon is locked to its propagation direction, we propose a controllable photon-emitter interface for quantum networks. We show that this chiral system enables the SWAP gate and a hybrid-entangling gate between the emitter and a flying single photon. It also allows deterministic storage and retrieval of single-photon states with high fidelities and efficiencies. In short, this chirally coupled emitter-photon interface can be a critical building block toward a large-scale quantum network.
@article{arxiv.1803.05626,
title = {Quantum memory and gates using a Lambda-type quantum emitter coupled to a chiral waveguide},
author = {Tao Li and Adam Miranowicz and Xuedong Hu and Keyu Xia and Franco Nori},
journal= {arXiv preprint arXiv:1803.05626},
year = {2018}
}