High-rate, high-fidelity entanglement of qubits across an elementary quantum network
- Resource Type
- Working Paper
- Authors
- Stephenson, L J; Nadlinger, D P; Nichol, B C; An, S; Drmota, P; Ballance, T G; Thirumalai, K; Goodwin, J F; Lucas, D M; Ballance, C J
- Source
- Phys. Rev. Lett. 124, 110501 (2020)
- Subject
- Quantum Physics
Physics - Atomic Physics
- Language
We demonstrate remote entanglement of trapped-ion qubits via a quantum-optical fiber link with fidelity and rate approaching those of local operations. Two ${}^{88}$Sr${}^{+}$ 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 $182\,\mathrm{s}^{-1}$ (success probability $2.18\times10^{-4}$).
Comment: v2 updated to include responses to reviewers, as published in PRL