Karl Franzens University Graz
Graz University of Technology
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Karl Franzens University Graz | Graz University of Technology | |
Many-Body Open System Dynamics with Cold Atoms : Quantum State Engineering and Dynamical Phase Transitions An open many-body quantum system, whose time evolution is governed by a master equation, can be driven into a given pure quantum state by an appropriate design of the system-reservoir coupling. We discuss two applications of this setting: First, we study a dynamical phase transition resulting from the competition of unitary and dissipative dynamics. It shares features of quantum and classical phase transitions. Furthermore, a novel dynamical instability is identified. Second, we discuss the driven-dissipative preparation of a mean-field d-wave superfluid of paired fermions. The paired state is obtained from quasi-local single particle dissipative operations on earth alkaline atoms in an optical lattice. Such an entropy zero phase may constitute a valuable initial state for the quantum simulation of the fermionic Hubbard model. |