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Tuesday, January 31, 2012 4:00 pm - 5:00 pm EST (GMT -05:00)

Rajamani Vijayaraghavan: Tracking the state of a quantum system in real-time: From quantum jumps to feedback

Rajamani Vijayaraghavan, Berkeley

Abstract

How does a quantum system evolve during measurement? The textbook picture of instantaneous, projective measurements only describes the situation before and after, but since any realistic experiment takes a finite amount of time, it is natural to talk about the evolution during the process. Surprisingly, using weak measurements it is possible to completely determine the evolution of the quantum state and look inside the so-called wavefunction collapse.