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Parameter and State Estimation in Open Quantum Systems: New Perspectives

Monday, December 4, 2017 - 11:30
Place: 
Donostia International Physics Center
Who: 
Eliska Greplova, U Aarhus, Denmark
Source Name: 
DIPC

In quantum optics, a quantum system is often measured
continuously over time and the post-processing of the measured signal is then
used to characterise the parameters and/or underlying quantum state. In this
talk I will present the so-called past quantum state, a general technique that
helps us determine outcome of measurements in the case when a system is being
continuously monitored. As a general technique developed using basic building
blocks of quantum measurement theory it can be (and has been) applied to a
variety of experimental systems and led to the improvement of existing
parameter estimation techniques.  I will
discuss in more detail the application of the method in the example scenario of
electron spin and population dynamics of a quantum dot. I will compare
routinely used parameter estimation techniques with new approaches based on
neural networks and show how this novel paradigm allows us to estimate physical
parameters beyond the realm of Markov approximation.

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