High-rate high-fidelity entanglement of qubits across an elementary quantum network

Journal article

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 spontaneously emitted 422 nm photons which are coupled by high-numerical-aperture lenses into single-mode optical fibers and interfere on a beam splitter. A novel geometry allows high-efficiency photon collection while maintaining unit fidelity for ion-photon entanglement. We generate heralded Bell pairs with fidelity 94% at an average rate 182 s⁻¹ (success probability 2.18×10⁻⁴).

Authors: Stephenson, L; Nadlinger, D; Nichol, B; Drmota, P; Ballance, T

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review Letters
• Volume: 124
• Issue: 11
• Article number: 110501
• Publication date: 2020-03-16
• Acceptance date: 2020-02-14
• DOI: 10.1103/PhysRevLett.124.110501
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: FFR