Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Photonics I
Q 31.5: Talk
Wednesday, March 16, 2022, 11:30–11:45, Q-H15
Integrated Grating Outcoupler for Ion-based Quantum Computers — •Anastasiia Sorokina1,2, Steffen Sauer1,2, Johannes Dickmann1,2, and Stefanie Kroker1,2,3 — 1Institute of Semiconductor Technology, Technische Universität Braunschweig, 38106 Braunschweig, Germany — 2Laboratory for Emerging Nanometrology (LENA), Langer Kamp 6a/b, 38106 Braunschweig, Germany — 3Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Trapped-ion qubits are considered a promising platform for quantum computation due to their long coherence times and high fidelity. Nevertheless, the existing requirements for the control and operation of the ions is currently accessed via conventional optics. Consequently, increasing the number of ion-trapped qubits is complex and intricate. Additionally, the sheer complexity of the optical arrangement results in vibrational noise and a decreased operational fidelity. To optically operate the multi-level transitions of the ion, we explore an integrated optical system comprising a waveguide and a grating coupler. This system delivers and focuses light to the position of the ion. In order to ensure single-mode waveguide operation, COMSOL Multiphysics FEM solver was utilized. Additionally, Lumerical FDTD solver was used to optimise the light focusing ability of the grating coupler. We present the numerical results covering the whole wavelength range of ion transitions with an optical system on a single chip.