Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 37: Nonlinear Dynamics, Synchronization and Chaos

DY 37.2: Vortrag

Mittwoch, 9. März 2016, 10:15–10:30, H48

Injection Locking in the Quantum Regime — •Steffen Holzinger¹, Elisabeth Schlottmann¹, Benjamin Lingnau², Kathy Lüdge², Christian Schneider³, Martin Kamp³, Sven Höfling³, Janik Wolters¹, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany — ²Institut für Theoretische Physik, Technische Universität Berlin, Berlin, Germany — ³Technische Physik, Julius-Maximilians-Universität Würzburg, Würzburg, Germany

The frequency of an oscillator can be controlled by injecting an external signal. This general concept in non-linear dynamics can be applied to plenty of physical and biological systems. In classical systems this control is well understood by Adler's theory and modifications thereof. In the present work we explore the phenomenon of injection locking, widely applied in standard semiconductor lasers, for the first time in quantum-dot microlasers operating in the regime of cavity quantum electrodynamics (cQED) with on average only few tens of photons in the cavity. In contrast to predictions of classical deterministic rate equations, we find the laser in a superposition of oscillating synchronized to the external signal and at its solitary frequency. With semi-classical rate equations based on a quantum Langevin approach we can show that our experimental results on "partial injection locking" are specific to non-linear cQED systems where cavity enhanced spontaneous emission noise plays an important role. As such, our results pave the way for unravelling exciting effects of injection locking and synchronization in the quantum regime.