Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 62: Poster: Open and Complex Quantum Systems
FM 62.4: Poster
Mittwoch, 25. September 2019, 16:30–18:30, Tents
Entanglement bounds and entanglement protection with generalized Gaussian non-Markovian unravelings — •Nina Megier1,2,3, Walter T. Strunz1, Carlos Viviescas4, and Kimmo Luoma1 — 1Institut für Theoretische Physik, Technische Universität Dresden, Dresden, Germany — 2Dipartimento di Fisica "Aldo Pontremoli", Università degli Studi di Milano, Milan, Italy — 3Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Milan, Italy — 4Universidad Nacional de Colombia, Bogota D.C., Colombia
Generalized Gaussian non-Markovian unravelings are useful tool to describe the dynamics of the open quantum system, where the trajectories fulfill the generalized stochastic Schrödinger equation [1-3]. Here we show a derivation of the evolution equation from the microscopic description of the total system [4]. Our characterization of the dynamics generalizes the standard approach [5], as the complex noise driving the evolution has both a Hermitian correlation and a non-Hermitian correlation. The additional degrees of freedom of our description (resulting from the non-zero non-Hermitian correlation) can be used for quantum informational tasks. We discuss such applications as improving entanglement bounds and environment-assisted entanglement protection.
[1] - L. Diósi, L. Ferialdi, PRL 113, 200403 (2014), [2] - A.A. Budini, PRA 92, 052101 (2015), [3] - L. Ferialdi, PRL 116, 120402 (2016), [4] - N. Megier, W. T. Strunz, C. Viviescas, K. Luoma, PRL 120, 150402 (2018), [5] - W.T. Strunz, L. Diósi, N. Gisin, PRL 82, 1801 (1999)