SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Technology
Q 12.6: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Generation of Optical Pulses for Solid-State Qubit Control — •Kilian Unterguggenberger1, Laura Orphal-Kobin1, and Tim Schröder1, 2 — 1Department of Physics, Humboldt-Universität zu Berlin, Germany — 2Ferdinand-Braun-Institute, Berlin, Germany
Many quantum information protocols proposed for solid-state qubits require coherent optical pulses as an elementary tool for, e.g., single-shot readout and spin-photon entanglement. Pulse lengths on the nanosecond timescale and pulse areas matching the respective Rabi frequency are required to address, for example, diamond color centers.
To achieve a short rise time and a high extinction ratio, we shape the light emitted by a narrow-bandwidth diode laser with an electro-optical modulator (EOM) in a Mach-Zehnder interferometer configuration. While commonly utilized for telecommunication with infrared light, operating an EOM at shorter, visible wavelengths is challenging due to the excitation of impurity sites in the waveguide material. The induced charge diffusion creates an internal electric field, causing the operation point of the modulator to drift. We stabilize the system using an active control feedback loop and characterize its performance. A fully polarization-maintaining fiber-coupled beam path makes the system flexible and enables precise pulse area adjustments using polarization optics.