Phys.org March 15, 2021
The implementation of efficient interfaces between photons and stationary qubits is crucial for the rate of information transfer and the scalability of a quantum network. With their experimental setup researchers in Germany demonstrated quantum entanglement between a stationary qubit and a photon out of an optical fiber resonator. They showed the generation of deterministic entanglement at a high fidelity of 90.1(17)% between a trapped Yb ion and a photon emitted into the resonator mode. And achieved a success probability for generation and detection of entanglement for a single shot of 2.5 × 10−3 resulting in 62 Hz entanglement rate. They observed that even at one and a half meters, the single ion and the photon shared a common entangled quantum state. The study is relevant for distributed quantum computing. In future studies, the researchers plan to further develop their system by improving the stability of the light-matter interface and using the setup for the distribution of quantum keys…read more. Open Access TECHNICAL ARTICLEÂ
Experimental setup. Credit: npj Quantum Information volume 7, Article number: 6 (2021)