Enhanced quantum estimation in open quantum systems

Event: 
IICQI 2012
Speaker(s): 
Talk type: 
Contributed
Abstract: 

We investigate estimation of an unknown parameter in quantum systems which are in interaction with an environment. We introduce a generalized quantum Fisher information in the vectorized space and show that this provides an upper bound for the genuine quantum Fisher information of the subsystem. Next we study the scaling relations of quantum Fisher information in open quantum systems.