Molecule-based coherent light-spin interfaces for quantum information processing -- optical spin state polarization in a binuclear Europium complex

• URL: http://arxiv.org/abs/2006.09831v1
• Date: Wed, 17 Jun 2020 13:09:07 GMT
• Title: Molecule-based coherent light-spin interfaces for quantum information processing -- optical spin state polarization in a binuclear Europium complex
• Authors: Kuppusamy Senthil Kumar, Diana Serrano, Aline M. Nonat, Beno\^it Heinrich, Lydia Karmazin, Lo\"ic J. Charbonni\`ere, Philippe Goldner, and Mario Ruben
• Abstract summary: Rare-earth ions (REIs) are suitable candidates for solid-state quantum information processing. As a first testimony of the usefulness of molecules for optical QIP applications, we demonstrate in this study that narrow spectral holes can be burned. Long-lived spectral holes are observed, demonstrating efficient polarization of Eu(III) ground state nuclear spins.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The success of the emerging field of solid-state optical quantum information processing (QIP) critically depends on the access to resonant optical materials. Rare-earth ions (REIs) are suitable candidates for QIP protocols due to their extraordinary photo-physical and magnetic quantum properties such as long optical and spin coherence lifetimes ($T_2$). However, molecules incorporating REIs, despite having advantageous properties such as atomically exact quantum tunability, inherent scalability, and large portability, have not yet been studied for QIP applications. As a first testimony of the usefulness of REI molecules for optical QIP applications, we demonstrate in this study that narrow spectral holes can be burned in the inhomogeneously broadened $^5$D$_0\to^7$F$_0$ optical transition of a binuclear Eu(III) complex, rendering a homogeneous linewidth ($\Gamma_h$) = 22 $\pm$ 1 MHz, which translates as $T_2 = 14.5$ $\pm$ 0.7 ns at 1.4 K. Moreover, long-lived spectral holes are observed, demonstrating efficient polarization of Eu(III) ground state nuclear spins, a fundamental requirement for all-optical spin initialization and addressing. These results elucidate the usefulness of REI-based molecular complexes as versatile coherent light-spin interfaces for applications in quantum communications and processing.

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