High-Rate, High-Fidelity Entanglement of Qubits Across an Elementary Quantum Network
2020; American Physical Society; Volume: 124; Issue: 11 Linguagem: Inglês
10.1103/physrevlett.124.110501
ISSN1092-0145
AutoresL. J. Stephenson, D. P. Nadlinger, B. C. Nichol, Shuoming An, P. Drmota, T. G. Ballance, K. Thirumalai, J. F. Goodwin, D. M. Lucas, C. J. Ballance,
Tópico(s)Quantum Computing Algorithms and Architecture
ResumoWe 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 $2.18\times10^{-4}$).
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