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Résumé |
The past four years have seen rapid experimental progress in realizing the bosonic quantum error correction
code proposed in 2001 by Gottesman, Kitaev, and Preskill (GKP), in which logical states are encoded as grid
states of an oscillator [1]. Recent experimental milestones include the preparation and real-time error
correction of the GKP code in trapped-ion and circuit quantum electrodynamics (cQED) architectures [2-6].
In this overview talk, I will give a top-level review of cQED experiments in our lab that have led to these
advances, focusing on the quantum engineering for error correction of the GKP code [2] and how the same
tools can be used for universal control of an oscillator with weak dispersive coupling to a qubit [5]. I will also
discuss our recent results on optimizing the error correction protocol using model-free reinforcement
learning, leading to the demonstration of a fully error-corrected quantum memory with coherence beyond
break even [6]. Finally, if time allows, I will discuss the next steps, including our ongoing experimental work
towards realizing single- and two-qubit gates on error-corrected GKP qubits and towards fault tolerant
quantum error correction.
[1] Gottesman, Kitaev, Preskill, PRA 2001; [2] Campagne-Ibarcq, Eickbusch, Touzard et al. Nature 2020 ; [3]
Flühmann et al. Nature 2019 ; [4] de Neeve et al. Nature Physics 2022; [5] Eickbusch et al. Nature Physics
2022; [6] Sivak et al. Nature 2023. |
