This work would not have been possible without the help and support I received during my stay in Austin. It is a pleasure for me to thank those people. Foremost, I would like to thank my supervisor Prof. Mark Raizen, his friendliness and helpfulness make working in the group so enjoyable and constructive. I am honored that I was given the opportunity to work in this group. Thank a lot for all the help and support! I wish to express my thank to Ed Narevicius, our former post-doc, for all his constructive comments and help. Many thanks to the slow beam group: Adam Libson, for his patience, detailed explanations and help during the year, Isaac Chavez, who was always there to help me out and to answer crucial questions about football rules, Tom Mazur, Julia Majors and Christian Parthey. I learned a lot from all of you, thanks
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