Bonn 2025 – scientific programme
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QI: Fachverband Quanteninformation
QI 37: Poster – Quantum Information Technologies (joint session Q/QI)
QI 37.3: Poster
Thursday, March 13, 2025, 17:00–19:00, Tent
Two-cavity-mediated photon-pair emission by one atom — •Tobias Frank, Gianvito Chiarella, Pau Farrera, and Gerhard Rempe — Max Planck Institute for Quantum Optics, Hans-Kopfermann-Straße 1, 85748 Garching bei München
Single atoms coupled to high-finesse Fabry-Perot cavities provide a versatile quantum network node, enabling efficient generation, storage, and manipulation of photonic qubits with high fidelity. A key focus of ongoing research is to scale either the number of atoms coupled to the cavity or the number of cavity modes interacting with each atom. Our group achieved the latter by using two optical fiber based cavities which couple independently to a single atom in the high atom-photon cooperativity regime. This enables new quantum communication schemes, in which photonic qubits are either tracked by nondestructive qubit detection or received by an heralded quantum memory. In our recent work, we demonstrate an on-demand photon pair generation scheme [1] in which a single atom with three energy levels in a ladder configuration couples to two optical fiber cavities, generating photon pairs with an in-fiber emission efficiency of ηpair = 16(1)%. We study the correlation properties of the emitted light and simulate the regime of strong atom-photon coupling, in which the atom emits photon pairs without populating the intermediate state. We propose a scenario to observe such a double-vacuum-stimulated effect experimentally.
[1] G Chiarella, T Frank, P Farrera, G Rempe. Optica Quantum Vol. 2, Issue 5, pp. 346-350 (2024)
Keywords: Cavity QED; Fiber cavities; Photon pairs; Three-level atom; Double-vacuum STIRAP