Acknowledgments

Physics and Astronomy at the University of Turku during the years 2008-2012. I wish to thank my supervisor Dr. Sabrina Maniscalco for her careful guidance during these four years. Her enthusiasm regarding both scientific and public outreach activities has made working in the group of Open Quantum Systems and Entanglement a true pleasure. From the scientific point of view, I wish to thank especially all my co-authors, Dr. Jyrki Piilo, Prof. Kalle-Antti Suominen, Prof. Matteo G. A. Paris and Dr. Michael J. W. Hall for fruitful collaboration and pleasant scientific discussions. My warmest thanks goes to all my friends and colleagues of "the corridor". I enjoyed very much spending time with them both in the office and outside of University. I want to thank my family for their all-round support and interest in my work. In particular I am deeply grateful for my husband Ville for his suppor