**About the Special Issue Editors**

**Wiesław Leo ´nski** (Prof. Dr hab.) works as a full professor at the Institute of Physics, University of Zielona Gora, Poland, where he is head of the Quantum Optics and Engineering Division. ´ He also leads the newly established Laboratory of Quantum Optics and Optical Technologies. W. Leonski completed his studies at Adam Mickiewicz University in Pozna ´ n, Poland, and Keble ´ College, University of Oxford, U.K. He gained a Ph.D. and postdoctoral degree at Adam Mickiewicz University. In 2015, the President of the Polish Republic conferred him the title of Professor in Physics. His research interests are related to quantum and nonlinear optics, quantum correlations, classical and quantum chaos, and quantum information theory. He has published over 100 scientific articles in international journals and presented over 100 conference communications. He is a member of the Polish Physical Society, European Optical Society, American Physical Society, Optical Society of America, and The American Association for the Advancement of Science.

**Joanna K. Kalaga** (Dr.) holds a Ph.D. in Physics from the University of Zielona Gora (Poland, 2012). ´ She is currently working as an Assistant Professor in the Quantum Optics and Engineering Division at the Institute of Physics at the University of Zielona Gora. Her main research interests include ´ quantum optics, quantum information theory, and quantum chaos. She has published 27 research articles (22 of them are indexed in Clarivate Analytics Web of Science) and a book chapter. Dr. Kalaga is a member of the European Optical Society (EOS).

**Radosław Szcze´sniak** (Prof. Dr hab.). In 2002, Radosław Szczesniak obtained a Ph.D. in Physics from ´ the University of Silesia in Katowice, Poland. In 2013, he received thae postdoctoral degree awarded by the Wrocław University of Technology, Poland. Radosław Szczesniak works as a professor at the Czestochowa University of Technology. He conducts research in the fields of superconductivity, classical and quantum chaos, the theory of open systems, and quantum information.
