[quantum-info] Today's PIQuDos

[Markus Mueller]

Hi all,

please join us today at 4 pm in the Time Room for a PIQuDos seminar by 
Kavan Modi.


Title: *Operational approach to open dynamics in the presence of initial 
correlations*
Speaker: *Kavan Modi* (University of Oxford)

Abstract:
Quantum process tomography is the experimental procedure to determine 
the action of general transformations on quantum states.
When an external environment is interacting with the system these 
transformations are called open. We show that if the state of the
system and the environment is correlated, at the beginning of the 
experiment, then the standard quantum process tomography procedure 
fails. It produces results that are nonlinear and non-positive (i.e., 
the dynamical map is not completely positive) . These undesirable 
behaviours are functions of the preparation procedure employed to 
initialise the system. We offer a full resolution to these difficulties 
by operationally deriving a procedure for process tomography. 
Surprisingly, there are additional benefits that come along with this 
procedure, namely quantifying the kickbacks due to the initial correlations.

Date: Monday, Dec 10, 2012 - 4:00 pm
Location: Time Room


Best,
Markus

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