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Q: Fachverband Quantenoptik und Photonik
Q 64: Solid State Quantum Optics II
Q 64.2: Talk
Friday, March 15, 2024, 11:15–11:30, HS 3219
Towards Cavity-Enhanced Spectroscopy of Single Europium Ions in Yttria Nanocrystals — •Timon Eichhorn1, Jannis Hessenauer1, Philippe Goldner2, Diana Serrano2, and David Hunger1 — 1Karlsruher Institut fuer Technologie, Karlsruhe, Germany — 2Université PSL, Chimie ParisTech, 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. We study Eu3+ ions doped into Y2O3 nanoparticles (NPs)[1] 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 [2,3]. A beneficial ratio of the narrow homogeneous line to the inhomogeneous broadening of the ion ensemble makes it possible to spectrally address single ions. The coherent control of the 5D0−7F0 transition then permits optically driven single qubit operations on the Europium nuclear spin states. A Rydberg-blockade mechanism between nearby ions permits the implementation of a two-qubit CNOT gate to entangle spin qubits and perform quantum logic operations. We observed fluorescence signals from small ensembles of Europium ions at cryogenic temperatures and measured cavity-enhanced optical lifetimes of half the free-space lifetime resulting in effective Purcell-factors of one. We will report on measurements of the optical coherence of small Eu3+ ion ensembles and our progress towards single ion readout and control. [1] Nano Lett. 17 (2017) 778-787, [2] New J. Phys. 12 (2010) 065038, [3] New J. Phys. 20 (2018) 095006
Keywords: Rare-Earth Ions; Cavity-QED; Solid State Spin Qubits; Solid State Quantum Computing; Purcell-enhancement