Freiburg 2024 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.23: Poster

Mittwoch, 13. März 2024, 17:00–19:00, KG I Foyer

Fast, efficient and lossless measurement of atom-photon entanglement — •Gianvito Chiarella, Tobias Frank, Pau Farrera, and Gerhard Rempe — Max Planck Institute for Quantum Optics, Garching bei München, Germany

Efficient quantum light-matter interfaces are crucial for the development of quantum networks, which allow the generation, distribution and storage of quantum states over remote locations. Two important capabilities of a quantum network node are the efficient generation of entanglement between a stationary and a flying qubit and the measurement of the stationary qubit in a fast and efficient way. Moreover it is also important that the stationary qubit is usable after its measurement. Even though these features have been shown separately in previous works, achieving them simultaneously remains a challenge. Here we report about a quantum network node composed of a single Rb87 atom coupled to two crossed fiber resonators, one mediating the generation of a photonic qubit entangled with the atom, and the other collecting fluorescence photons for atomic state measurement. We achieve an entanglement generation efficiency of 44%, and we measure an atomic state in 7.5us with a fidelity of 98.5%. The implementation of such a node in a quantum network would be beneficial for quantum communication protocols that involve the distribution of entanglement between nodes as a resource.

Keywords: Entanglement; Cavity QED; Atom; Fiber cavities; Photon