Quantum information stored in a GKP code in a microwave cavity has been actively maintained using cycles of QEC whose structure is determined by a reinforcement learner. https://errorcorrectionzoo.org/c/gkp 2/5
While the new work uses reinforcement learning, it is based on a theory paper whose supplement quite nicely explains the basics of "infinitesimal" GKP QEC using only a qubit ancilla. https://arxiv.org/abs/2009.07941 5/5
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