SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Quantum Information (joint session QI/Q)
Q 11.20: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Controlling single erbium dopants in a Fabry-Perot resonator — •Alexander Ulanowski1, Benjamin Merkel1, and Andreas Reiserer1,2 — 1MPI of Quantum Optics, Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Ludwig-Maximilians-Universität München, München, Germany
Erbium dopants exhibit unique optical and spin coherence lifetimes and show great promise for long-distance quantum networks, as their emission lies in the minimal-loss window of optical fibers. To achieve an efficient spin-photon interface for single dopants, we integrate thin host crystals into cryogenic Fabry-Perot resonators. With a Finesse of 1.2 · 105 we can demonstrate up to 58(6)-fold Purcell enhancement of the emission rate, corresponding to a two-level cooperativity of 530(50). Our approach avoids interfaces in the proximity of the dopants and therefore preserves the optical coherence up to the lifetime limit. [1]
Using this system, we resolve individual Erbium dopants which feature an ultra-low spectral diffusion of less than 100 kHz, being limited by the nuclear spin bath. This should facilitate frequency-multiplexed spin-qubit readout, control and entanglement, opening unique perspectives for the implementation of quantum repeater nodes.
[1] B. Merkel, A. Ulanowski, and A. Reiserer, Phys. Rev. X 10, 041025 (2020)