From quantum non-demolition measurements to jumps and spikes in quantum trajectories
Prof.Michel BAUER(IPhT CEA, Saclay)
Amphithéâtre Léon Motchane (IHES)
Amphithéâtre Léon Motchane
35, route de Chartres
In 1913, Niels Bohr wrote his groundbreaking paper "On the Constitution of Atoms and Molecules", were he already mentioned quantum jumps between energy levels. Later on, he was also the leader of the Copenhagen interpretation of measurement. A century later, thanks to major progresses in fast electronics and low temperature physics, the delicate manipulation of simple quantum systems, and the observation of quantum jumps and quantum trajectories, have become a reality. These observations teach us important things about measurement, with deep theoretical implications, but also with practical stakes for the conception of the still elusive quantum computers. After a brief overview, we shall focus on a few recent experiments dedicated to simple quantum systems and on their theoretical interpretation which involves some remarkable probabilistic results and structures.