The complexity of learning quantum states and evolutions is related to the complexity of creating them.

From the article:

Learning Quantum States and Unitaries of Bounded Gate Complexity
Haimeng Zhao, Laura Lewis, Ishaan Kannan, Yihui Quek, Hsin-Yuan Huang, and Matthias C. Caro
PRX Quantum 5, 040306 (2024)

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