Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 28: Poster – Quantum Optics
Q 28.8: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG
Qubit entanglement via a single-mode Gaussian lateral defect Fabry-Perot cavity — •Ruolin Guan1, Pengji Li2, Xian Zheng2, Vineesha Srivastava3, Chenxi Ma2, Eddy P. Rugeramigabo2, Michael Zopf2, 4, Klemens Hammerer1, 3, and Fei Ding2, 4 — 1Institut für Theoretische Physik, Leibniz Universität Hannover, Germany — 2Institute of Solid State Physics, Leibniz University Hannover, Germany — 3Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Innsbruck, Austria — 4Laboratory of Nano and Quantum Engineering, Leibniz University Hannover, Germany
We propose a chip-compatible DBR Fabry-Perot cavity with a lateral Gaussian defect that allows two InAs/GaAs quantum dots to couple to a single optical mode. Using full-wave FDTD simulations and a single-mode Green-function mapping, we derive the collective decay rate and the exchange coupling. These parameters can be tuned continuously via the relative phase, enabling transitions between superradiant, subradiant, and dispersive regimes within the same device. We further show that the second-order correlation function serves as an experimentally accessible entanglement witness, and demonstrate two prototypes: a superradiant single-photon source and a dissipatively protected quantum phase gate.
Keywords: Quantum optics; Cavity QED; Quantum dot; subradiance; Quantum phase gate