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Q: Fachverband Quantenoptik und Photonik

Q 50: Quantum Information (Concepts and Methods) IV

Q 50.6: Vortrag

Donnerstag, 14. März 2019, 15:30–15:45, S HS 001 Chemie

Parametrization and optimization of Gaussian non-Markovian unravelings for open quantum dynamics — Nina Megier¹, Walter T. Strunz¹, Carlos Viviescas², and •Kimmo Luoma¹ — ¹Institut für Theoretische Physik, Technische Universität Dresden, D-01062,Dresden, Germany — ²Departamento de Fisica, Universidad Nacional de Colombia, Carrera 30 No. 45-03, Bogota D.C., Colombia

We derive a family of Gaussian non-Markovian stochastic Schrödinger equations for the dynamics of open quantum systems. The different unravelings correspond to different choices of squeezed co- herent states, reflecting different measurement schemes on the environment. Consequently, we are able to give a single shot measurement interpretation for the stochastic states and microscopic ex- pressions for the noise correlations of the Gaussian process. By construction, the reduced dynamics of the open system does not depend on the squeezing parameters. They determine the non-Hermitian Gaussian correlation, a wide range of which are compatible with the Markov limit. We demonstrate the versatility of our results for quantum information tasks in the non-Markovian regime. In partic- ular, by optimizing the squeezing parameters, we can tailor unravelings for improving entanglement bounds or for environment-assisted entanglement protection.