Time in Quantum Mechanics 2

But all the clocks in the city Began to whirr and chime: ’O let not Time deceive you, You cannot conquer Time. The treatment of time in quantum mechanics continues to be a key challenge in the foundation of quantum theory. This book follows Time in Quantum Mechanics—Volume 1 and is the second volume to detail the problems, attempts and achievements in defining, formalizing and measuring different time quantities in quantum theory. It touches upon numerous related issues as well. Time in Quantum Mechanics—Volume 2 opens with a brief historical overview. It then offers eleven tutorial reviews which cover many open questions regarding fundamental concepts and time observables as well as a number of quantum dynamical effects and their associated characteristic time scales. In addition, the volume contains a tutorial review on atomic clocks that explains that while we do not know what time is, we know very well how to measure it with exceptional accuracy. Thorough and lucid, this book is written as an introductory guide for newcomers to the subject. However, it is also useful as a reference for the expert. But all the clocks in the city Began to whirr and chime: ’O let not Time deceive you, You cannot conquer Time. W. H. Auden It is hard to think of a subject as rich, complex, and important as time. From the practical point of view it governs and organizes our lives (most of us are after all attached to a wrist watch) or it helps us to wonderfully ?nd our way in unknown territory with the global positioning system (GPS). More generally it constitutes the heartbeat of modern technology. Time is the most precisely measured quantity, so the second de?nes the meter or the volt and yet, nobody knows for sure what it is, puzzling philosophers, artists, priests, and scientists…