High-Rate, High-Fidelity Entanglement of Qubits Across an Elementary Quantum Network.
Bulletin of the American Physical Society(2020)
摘要
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 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}).
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关键词
Quantum Entanglement,Coherent Optical Media,Optical Bistability,Photon Storage,Quantum Information
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