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Cats, Decoherence and Quantum Measurement

Speaker: 
Amir O. Caldeira
Date: 
Thu, 27/02/2014 - 4:00pm to 5:00pm
Location: 
CQT Seminar Room, S15-03-15
Event Type: 
Seminars

In this talk it is our intention to review the basic ideas of how entanglement relates to the so-called Schrödinger cat state and present a paradigmatic situation where states very similar to that one can be created. The example we have chosen is the SQUID ring which depending on the external bias allows us to implement a wealth of interesting physical situations to be treated. We shall argue that in these situations the question of dissipation is really relevant and the concept of decoherence naturally arises. Once we have accomplished that we discuss some possible implications of decoherence to the quantum theory of measurement . As a matter of fact, we shall employ an alternative measure of quantum correlation which goes beyond entanglement – the quantum discord – with the same purpose. We finally present recent experimental results performed with twin photons which corroborate our predictions.

This Colloquium is jointly organised with the Center For Quantum Technologies, NUS. 

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