We demonstrate remote entanglement of trapped-ion qubits via a quantum-optical fiber link with fidelity and rate approaching those of local operations. Two 88Sr+ qubits are entangled via the polarization degree of freedom of two photons which are coupled by high-numerical-aperture lenses into single-mode optical fibers and interfere on a beamsplitter. A novel geometry allows high-efficiency photon collection while maintaining unit fidelity for ion-photon entanglement. We generate remote Bell pairs with fidelity F=0.940(5) at an average rate 182s−1 (success probability 2.18×10−4).
@article{arxiv.1911.10841,
title = {High-rate, high-fidelity entanglement of qubits across an elementary quantum network},
author = {L J Stephenson and D P Nadlinger and B C Nichol and S An and P Drmota and T G Ballance and K Thirumalai and J F Goodwin and D M Lucas and C J Ballance},
journal= {arXiv preprint arXiv:1911.10841},
year = {2020}
}
Comments
v2 updated to include responses to reviewers, as published in PRL