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We elaborate on a proposal for the state preparation of quantum many-body systems by engineered dissipation. Specifically, we discuss the purely dissipative dynamics of a large system of s = 1/2 quantum spins or, equivalently, hard-core bosons on a regular lattice. In the first part of the talk, we introduce the underlying quantum master equation (Lindblad equation) and exemplify how it can be used to determine the equations of motion for correlation functions. In the second part of the talk, we resolve the real-time dynamics of the dissipative process. This allows us to identify different characteristic time scales for the dynamics for which we determine their finite-size scaling. We introduce the concept of cumulative entanglement distribution to quantify multi-particle entanglement and show that the considered protocol serves as an efficient method to prepare a macroscopically entangled Bose-Einstein condensate.

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David Mesterhazy & Florian Hebenstreit, Universitity of Bern
Seminar Room 0.02, ETP
Contact: Sebastian Diehl