SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 2: Precision spectroscopy of atoms and ions (joint session A/Q)
A 2.6: Poster
Montag, 20. September 2021, 16:30–18:30, P
Self-injection locked laser system for quantum logic and entanglement operations — •Ludwig Krinner1, 2, Lennart Pelzer1, Kai Dietze1, Nicolas Spethmann1, and Piet O. Schmidt1, 2 — 1Physikalisch Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig — 2Leibniz Universität Hannover, Welfengarten 1, 30167, Hannover
While diode lasers have become a prevalent tool for the cooling and coherent manipulation of atoms and ions, they typically show an inconvenient and sometimes even problematic amount of noise at Fourier frequencies of a few hundred kilohertz to a few megahertz. Especially in the case of trapped ions, this coincides with the motional frequencies of the secular motion. Excess noise can compromise coherent manipulation of sideband transitions, such as sideband cooling or entanglement operations by incoherently driving the much stronger carrier transitions. We demonstrate a self-injection locked laser system using the transmitted light of a medium-finesse linear cavity. The system can easily be adapted from an existing standard Pound-Drever-Hall laser locking scheme using a linear cavity, as opposed to Y-shaped or bow-tie cavities, which are usually employed for self-injection locking. We demonstrate the excellent suppression of high frequency noise by measuring incoherent excitation 0.3 … 4 MHz away from the carrier transition using a single trapped 40Ca+ ion as a probe, finding an inferred reduction of over 30 dB in noise spectral density compared to a state-of-the art external-cavity diode laser.