[quantum-info] Next week's PIQuDos

[Markus Mueller]

Hi all,

please join us on Monday at 4 pm for a PIQuDos seminar by Cyril Stark.


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: TBA


Best,
Markus

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