# Atomic Physics Seminars

**Special Quantum Information/Mathematical Physics Seminar**

Tuesday, March 29, 2016

3:30 PM

Physics Building, Room 313

Note special date.

Note special time.

Note special room.

## "Non-demolition measurements and their perturbations"

**Matt Fraas , Ludwig-Maximilians-Universität Munich**

[Host: Israel Klich ]

Indirect measurements, of which non-demolition measurements is a specific subclass, describe a physical situation in which an information about a quantum system is acquired through a direct measurement on a sequence of probes subsequently interacting with the system. Recent interest in the field originates in the photon counting experiments of Haroche. Mathematically the problem is equivalent to the study of statistics of long products of completely positive maps. I describe this mathematical theory with a special focus on the non-demolition subclass -- this is the case when all the map commutes -- and its small perturbation.

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