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Dissipative quantum many-body systems are extremely challenging to analyze, as most theoretical tools developed for equilibrium systems cannot be applied. I will present a variational principle that can be applied to obtain a better understanding of the essential physics within these systems, such as dissipative phase transitions [1,2]. Within the context of a dissipative Ising model, I will compare the variational method to recent results obtained using a tensor network approach [3]. Finally, I will demonstrate how a better fundamental understanding of dissipative quantum many-body systems enables the realization of a novel class of dissipative quantum sensors [4]. References [1] H. Weimer, Phys. Rev. Lett. 114, 040402 (2015). [2] V. R. Overbeck, M. F. Maghrebi, A. V. Gorshkov, H. Weimer, Phys. Rev. A 95, 042133 (2017). [3] A. Kshetrimayum, H. Weimer, R. Orus, Nature Commun. 8, 1291 (2017). [4] M. Raghunandan, J. Wrachtrup, H. Weimer, Phys. Rev. Lett. 120, 150501 (2018).

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Hendrik Weimer, Uni Hannover
Seminar Room of the Institute of Physics II
Contact: Sebastian Diehl