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Quantum 2.0 Conference and Exhibition

Fluorescence detected photon echoes in Er3+:Y2SiO5

Félix Montjovet-Basset, Jayash Panigrahi, Diana Serrano, Alexandre Tallaire, Patrice Bertet, Alexey Tiranov, Philippe Goldner

Published Jan 1, 2024• 0 citations
Publisher

Abstract

Understanding the dephasing dynamics of quantum materials with a low number of emitters is crucial for optimizing them for quantum nanophotonics. Here, we investigate the recovery of photon echoes from fluorescence emissions in rare-earth doped systems.
DOI
10.1364/quantum.2024.qw4b.6

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Atomic-like emitters in the solid state serve as important resources in the advancement of future quantum networks. In particular, intra-4f optical transitions of rare earth ions exhibit excellent coherence properties thanks to the shielding effect of outer electrons. Still, the presence of various dephasing channels in solid state hosts introduces additional decoherence beyond the radiative decay, causing the coherence time of most rare earth doped materials to be over an order of magnitude lower than the radiative limit. Such obstacle prevents the emission of indistinguishable photons from rare earth ions, which is an essential requirement for various quantum applications. In this work, we perform optical coherence study on erbium ions doped in thin-film lithium niobate by patterning photonic crystal resonators with quality factor around 100 k and sub-λ3 mode volume. Leveraging the combination of long coherence and strong Purcell enhancement in the cavity, we show that the coherence time measured with photon echo approaches the radiative limit (80%), representing a 50-fold improvement compared to the waveguide case. Our results present promising prospects toward utilizing rare earth doped materials as quantum repeaters and sources of indistinguishable photons.