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