Theoretical Physics

19 March 2014
Time: 15:00 to 16:00
Location: E C Stoner SR 7.70

Clive Emary (Hull)

Quantum feedback control

Feedback control plays an important role in `classical technology' and the bet is that this will continue to be the case as technology moves into the quantum realm.  In this talk I will discuss two aspects of my work on the theory of quantum feedback control.  Firstly, I will discuss quantum transport, where feedback can be used to modify the conduction and noise properties of quantum nanoscale conductors, as well as produce novel effects such as a nanoelectric Maxwell's daemon and the stabilisation of non-equilibrium pure states.  Secondy, I will describe the influence of time-delayed feedback (`Pyragas') control on the Dicke-Hepp-Lieb superradiant quantum phase transition.  In this case, feedback dramatically alters the phase diagram of the system and gives rise to an infinite sequence of non-equilibrium phases with fixed points and limit cycles in the symmetry-broken regime.



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