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Lastly, we are interested in understanding the related question of how decoherence effects clock degrees of freedom used to measure events. It is well appreciated that decoherence is responsible for the quantum-classical transition as one moves from microscopic to macroscopic scales. This means that decoherence is also responsible for the difference between macroscopic (classical) clocks and atomic-scale (quantum) clocks. We will investigate how different types of environmental noise affect different clocks and how the quantum-classical transition is manifest.   \subsection{Context Within Present Research Program}  A large segment of my group works at the intersection of quantum chemistry with quantum computation and information theory as well as open quantum systems. Our research addresses how quantum systems can be used to simulate other quantum systems and the effects of decoherence. We have also worked in fields related to chemical dynamics and time-dependent processes in chemistry, as well as spectroscopy. A unifying theme of all this research is that it involves understanding how quantum many-body systems evolve in time.  Working in time-dependent quantum mechanics has led my group to ask the deep questions about the fundamental nature of time outlined in this proposal. I have a large interdisciplinary group with diverse backgrounds in physics and chemistry, well equipped to address both the computational and conceptual aspects of the proposed work. However, we do not yet have funding available to work exclusively on the fundamental role of time. The FQXI grant will help us to devote more resources to the fundamental questions about time.  \subsection{Context Within Present Research Program}  \subsection{Communicating Results to a Wider Audience}