[quantum-info] Today's PIQuDos
Markus Mueller
mmueller at perimeterinstitute.ca
Mon Dec 17 13:51:33 EST 2012
Hi all,
this is a reminder of Cyril Stark's talk today at 4 pm in the Time Room.
Title: *Inference of effective quantum models in the asymptotic regime*
Speaker: *Cyril Stark* (ETH Zurich)
Abstract:
In this talk I will sketch a project which aims at the design of
systematic and efficient procedures to infer quantum models from
measured data. Progress in experimental control have enabled an
increasingly fine tuned probing of the quantum nature of matter, e.g.,
in superconducting qubits. Such experiments have shown that we not
always have a good understanding of how to model the experimentally
performed measurements via POVMs. It turns out that the ad hoc
postulation of POVMs can lead to inconsistencies. For example, when
doing asymptotic state tomography via linear inversion, one sometimes
recovers density operators which are significantly not positive
semidefinite. Assuming the asymptotic regime, we suggest an alternative
procedure where we do not make a priori assumptions on the quantum
model, i.e., on the Hilbert space dimension, the prepared states or the
measured POVMs. In other words, we simultaneously estimate the dimension
of the underlying Hilbert space, the quantum states and the POVMs. We
are guided by Occam's razor, i.e., we search for the minimal quantum
model consistent with the data.
Date: Monday, Dec 17, 2012 - 4:00 pm
Location: Time Room (294)
Best,
Markus
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