Long-lived entanglement memory in a trapped-ion quantum network node
Morressier (2022)
A quantum network of entangled optical atomic clocks
(2021)
Experimental quantum key distribution certified by Bell's theorem
(2021)
Micromotion minimisation by synchronous detection of parametrically excited motion
(2021)
High-rate high-fidelity entanglement of qubits across an elementary quantum network
Physical Review Letters American Physical Society 124:11 (2020) 110501
Abstract:
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).