Double feature: A Quantum Network Node with Crossed Fiber Cavities (M.Sc. Manuel Brekenfeld)

  • Date: Oct 15, 2019
  • Time: 02:30 PM (Local Time Germany)
  • Speaker: M.Sc. Manuel Brekenfeld
  • Quantum Dynamics Division - MPQ
  • Location: Max Planck Institute of Quantum Optics
  • Room: Herbert Walther Lecture Hall
Recent experimental advancement in the field of optical cavity QED comprises two directions of development: A further reduction of the mode volumes of the resonators, as with 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 [2, 3].

We have set up a new experiment which combines these two experimental advancements in a single platform with single neutral atoms trapped at the center of two crossed FFPCs. Exploiting the possibilities provided by the new system, we have realized a quantum network node that couples to two spatially and spectrally distinct quantum channels. The node functions as a passive, heralded and high-fidelity quantum memory that requires neither amplitude- and phase-critical control fields [4] nor error-prone feedback loops [5] and is thus excellently suited for the realization of large-scale quantum networks and quantum repeaters.

[1] Hunger et al., New J. Phys. 12, 065038 (2010) [2] Leonard et al., Nature 543, 87 (2017) [3] Hamsen et al., Nat. Phys. 14, 885 (2018) [4] Specht et al., Nature 473, 190 (2011) [5] Kalb et al., Phys. Rev. Lett. 114, 220501 (2015)

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