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QI: Fachverband Quanteninformation
QI 23: Poster II (joint session QI/Q)
QI 23.62: Poster
Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof
A Quantum Network Node with Crossed Fiber Cavities — •Tobias Frank1, Gianvito Chiarella1, Pau Farrera1, Manuel Brekenfeld1, Joseph Christesen1,2, and Gerhard Rempe1 — 1MPQ, Hans-Kopfermann-Str. 1, 85748Garching, Germany — 2NIST, Boulder, Colorado 80305, USA
Recent development in the field of optical cavity QED mainly concern a further reduction of the mode volumes of the resonators, driven by the development of fiber-based Fabry-Perot cavities (FFPCs) [1], and an increase in the number of well-controlled modes the emitters can couple to. We implemented an experiment which combines these two experimental advancements in a single platform consisting of single neutral atoms trapped at the center of two crossed FFPCs. Exploiting the possibilities provided by this platform, we have realized a quantum network node that couples to two spatially and spectrally distinct quantum channels. The node functions as a passive heralded quantum memory [2], achieving a heralded average state fidelity of 94.7±0.2 % and neither requires amplitude- or phase-critical control fields [3] nor error-prone feedback loops [4]. Our platform is therefore excellently suited for the realization of future large-scale quantum networks and quantum repeaters.
[1] Hunger et al., New J. Phys. 12, 065038 (2010)
[2] Brekenfeld et al., Nature 591, 570 (2020)
[3] Specht et al., Nature 473, 190 (2011)
[4] Kalb et al., Phys. Rev. Lett. 114, 220501 (2015)