Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 77: Quantum Networks: Platforms and Components II

FM 77.6: Talk

Donnerstag, 26. September 2019, 15:30–15:45, 1098

Interfacing single Erbium ions with photons at telecom wavelength — •Benjamin Merkel, Pablo Cova Fariña, Alexander Ulanowski, Lorenz Weiß, Andreas Gritsch, and Andreas Reiserer — MPI of Quantum Optics, Garching, Germany

Global quantum networks will require efficient interfaces between long-lived memory nodes and photons at a telecommunications wavelength, where loss in optical fibers is minimal. In this context, individual Erbium ions doped into suited crystals are a promising candidate, as they exhibit both an optical transition at 1.5 µm and spin lifetimes exceeding 100 ms. Unfortunately, the long lifetime of the optical transition (≃10 ms) limits the fluorecence rate and makes it difficult to spectrally resolve and control single ions.

We study different approaches to overcome this limitation: First, we have assembled high-finesse cavities which will lead to an expected 200-fold reduction of the lifetime. We have stabilized their resonance frequencies to a fraction of a linewidth, i.e. to the sub-pm-level, despite the abundance of mechanical vibrations in a closed-cycle cryostat environment. Second, as a first step towards on-chip quantum network nodes, we try to combine Erbium ions with Silicon nano-photonic waveguides and photonic crystal cavities [1]. We will present the current status of the mentioned experiments.

[1] A. M. Dibos et al., Phys. Rev. Lett. 120, 243601 (2018)