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B1: Feedback control of open quantum systems

Principal investigator:

Prof. Dr. Andreas Knorr [1]

Dr. Alexander Carmele

Project summary:

The superposition principle and the corresponding non-classical features introduced by quantum inter-
ference are essential to quantum mechanics. In this project, we will theoretically study the possibility to
steer quantum interferences via a coherent self-feedback mechanism beyond classical Pyragas control.
Our goal is to enhance the probability of specific quantum states and to reduce dissipation in networks
consisting of coupled cavities and strongly-correlated emitters or spin-chains. Specifically, we will address phenomena in the few-excitation limit, such as feedback-controlled two-photon emission and reduction or enhancement of the spin-blockade effect in incoherently pumped Heisenberg spin chains.

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