3/1/2023 0 Comments Rf entanglerAlso consider mentioning that Krotov, according to Sec. What about mentioning that Krotov is a gradient-based method?ġ.2. For example, in the abstract a line could be added about a defining feature of the Krotov method with respect to other optimal control methods. more general comments about the Krotov method and the krotov library in the introductory part of the manuscript.ġ.1. Please consider addressing point (1.) of the weaknesses, i.e. I hope that the suggested modifications, once implemented in the revised manuscript, will make this tool of even greater help not only for the experts in the field, but for more researchers eager to learn about quantum optimal control with a hands-on approach.ġ. I am confident that the krotov library will become an important reference point in quantum optimal control theory resources, increasing the popularity of this method and possibly enhancing comparative studies benchmarking various algorithms with open-source code. The current library seems a timely addition to the toolbox of the quantum tech researcher, at a time when dissipation and noise hamper the ideal implementation of quantum protocols for quantum computing, quantum information processing and quantum control in general. The krotov package enriches a scene in quantum tech research that is increasingly relying on open-source packages to implement investigations and integrate functionalities. The manuscript provides details on the Python library and on the algorithms it implements, providing context on the Krotov method in the quantum optimal control field. The article provides the implementation of a quantum optimal control method for quantum information processing and quantum technology. This could be quite easily added in the initial parts of these sections to guide the reader with a stronger narrative. Details are very useful but a bird's-eye view seems somehow missing. In general, a pedagogical approach could greatly benefit the reader and increase the potential user base, whereas currently the discussion becomes quite technical and detail-oriented in Sections 2, 3, and 4. I do not have a specific recommendation on how to act in this regard, but possibly the introduction of a simple example as that of Appendix B could first gain the attention of the reader in the first part of the manuscript, leaving the full code for the example in the Appendix. Also, Section 3 does not look extremely easy to navigate. A somewhat more gentle introduction could be appealing to the reader. The discussion of the Krotov method and its implementation in the library are very technical, and there is a somewhat abrupt jump from the general discussion of the Introduction, or the first part of Section 2.1 and, e.g., the detailed description of the terms of Eq. Some are already present in the online examples, see. Also, plots relative to an example implementation could be included. For example, benchmarking and performance plots could be added. The inclusion of graphics could be attractive for the reader. General differences with existing methods could be highlighted more, even if some specific comparisons are addressed in detail in the following Section 4 of the manuscript.Ģ. The Introduction section could flesh out more how the Krotov method and its implementation in the presented library can help a researcher in quantum optimal control. Discussion of some applications is provided.ġ. The authors provide a nice introduction and bibliography for the field of quantum optimal control theory. Generally, the manuscript is very well written. Useful informative examples are provided online and in the manuscript, as well as code snippets in the manuscript.Ĥ. The open-source software package is developed according to the best practices of open-source code development (presentation, online documentation, comments in functions, code formatting, library organization, unit-testing, example notebooks). The library includes cutting-edge features and care toward code optimization. The manuscript and software package will make the Krotov method more accessible to a wider audience, increasing the possibility of benchmarking the performance and robustness various gradient-based and gradient-free methods and possibly their interplay.ģ. The manuscript and library present a useful tool for quantum optimal control, which is of interest to theoretical and experimental researchers in quantum physics, and it seems particularly timely in the current development of the field of quantum computing and more broadly of quantum information processing, in which noisy intermediate-scale quantum (NISQ) technology devices need to counteract the effect of noise.Ģ.
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