SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Quantum Information (joint session QI/Q)
Q 11.19: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Towards Cavity-Enhanced Spectroscopy of Single Europium Ions in Yttria Nanocrystals — Timon Eichhorn1, •Sören Bieling1, Christian Rentschler2, Shuping Liu3, Alban Ferrier3, Philippe Goldner3, and David Hunger1 — 1Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — 2CFEL/DESY, 22607 Hamburg, Germany — 3Chimie Paris Tech, 75231 Paris, France
A promising approach for realizing scalable quantum registers lies in the efficient optical addressing of rare-earth ion spin qubits in a solid state host. Within the EU Quantum Flagship project SQUARE we study Eu3+ ions doped into Y2O3 nanoparticles (NPs) as a coherent qubit material and work towards efficient single ion detection by coupling their emission to a high-finesse fiber-based Fabry-Pérot microcavity. A beneficial ratio of the narrow homogeneous line to the inhomogeneous broadening of the ion ensemble at temperatures below 10K makes it possible to spectrally address and readout single ions. The coherent control of the single ion 5D0−7F0 transition then permits optically driven single qubit operations on the Europium nuclear spin states. A Rydberg-blockade mechanism between ions within the same nanocrystal permits the implementation of a two-qubit CNOT gate to entangle spin qubits and perform quantum logic operations. Theoretical simulations of the single and two-qubit gate operations predict fidelities of up to 98.2% and 96.5%, respectively, with current material properties. We report on our progress to experimentally implement this scheme.