Multimodal Purcell enhancement and optical coherence of Eu <sup>3+</sup> ions in a single nanoparticle coupled to a microcavity
Europium-doped nanocrystals constitute a promising material for a scalable future quantum computing platform. Long-lived nuclear spin states could serve as qubits addressed via coherent optical transitions. In order to realize an efficient spin-photon interface, we couple the emission from a single nanoparticle to a fiber-based microcavity under cryogenic conditions. The spatial and spectral tunability of the cavity permits us to place individual nanoparticles in the cavity, to measure the inhomogeneous linewidth of the ions, and to show a multi-modal Purcell-enhancement of two transition in Eu<sup>3+</sup>. A halving of the free-space lifetime to 1.0 ms is observed, corresponding to a 140-fold enhancement of the respective transition. Furthermore, we observe a narrow optical linewidth of 3.3 MHz for a few-ion ensemble in the center of the inhomogeneous line. The results represent an important step towards the efficient readout of single Eu<sup>3+</sup> ions, a key requirement for the realization of single-ion-level quantum processing nodes in the solid state.
Authors
- Hugues de Riedmatten (ORCID: https://orcid.org/0000-0002-4418-0723)
- David Hunger (ORCID: https://orcid.org/0000-0001-6156-6145)
- Nicholas Jobbitt (ORCID: https://orcid.org/0000-0002-6361-3061)
- Timon Eichhorn (ORCID: https://orcid.org/0000-0003-3469-8876)
- Diana Serrano (ORCID: https://orcid.org/0000-0002-9478-3776)
- Robert Huber (ORCID: https://orcid.org/0000-0002-7457-1688)
- Shuping Liu (ORCID: https://orcid.org/0000-0001-9191-4948)
- Uli Lemmer (ORCID: https://orcid.org/0000-0001-9892-329X)
- Sören Bieling
- Philippe Goldner
- Tobias Krom
Institutions
- Karlsruhe Institute of Technology (DE)
- Institució Catalana de Recerca i Estudis Avançats (ES)
- Centre National de la Recherche Scientifique (FR)
- Chimie ParisTech - PSL (FR)
- Institute of Photonic Sciences (ES)
- Heidelberg University (DE)
- Université Paris Sciences et Lettres (FR)
- Southern University of Science and Technology (CN)
- Institut de Recherche de Chimie Paris (FR)
Publication Details
- Journal
- Nanophotonics
- Published
- 2025-02-12
- DOI
- https://doi.org/10.1515/nanoph-2024-0721
- Citations
- 1
- Primary Topic
- Photonic and Optical Devices
- Type
- article
- Field-Weighted Citation Impact
- 0.73
Funders
- European Commission
- Deutsche Forschungsgemeinschaft
- National Natural Science Foundation of China
- Bundesministerium für Bildung und Forschung
- Basic and Applied Basic Research Foundation of Guangdong Province