A Python implementation of Krotov's method for quantum optimal control

What is it about?

We present a new open-source Python package, krotov, implementing the quantum optimal control method of that name. It allows to determine time-dependent external fields for a wide range of quantum control problems, including state-to-state transfer, quantum gate implementation and optimization towards an arbitrary perfect entangler.

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Why is it important?

We provide a software package together with hands-on explanations and several examples. The user-friendly interface allows for combination with other Python packages, and thus high-level customization.

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