When memory qubits and photons get entangled

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 ARTICLE 

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