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Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 66: Quantum Effects (Entanglement and Decoherence)

Q 66.2: Talk

Friday, March 9, 2018, 10:45–11:00, K 1.013

Parametrization and optimization of Gaussian non-Markovian unravelings for open quantum dynamics — •Nina Megier1, Walter T. Strunz1, Carlos Viviescas2, and Kimmo Luoma11Institut für Theoretische Physik, Technische Universität Dresden, Germany — 2Departamento de Fisica, Universidad Nacional de Colombia, Bogota D.C., Colombia

A complete parametrization of diffusive stochastic Schrödinger equations in the Markovian regime is known (Wiseman, Diósi, Chem. Phys. 268, 91 (2001); Chia, Wiseman, PRA 84, 012119 (2011)). Changing these parameters allows control over the noise correlations driving the stochastic dynamics, which can be used to optimize the trajectories e.g. for entanglement detection (Viviescas et al., PRL 105, 210502 (2010); Guevara, Viviescas, PRA 90, 012338 (2014)).

A general non-Markovian Gaussian stochastic Schrödinger equation was recently postulated (Diósi, Ferialdi, PRL 113, 200403 (2014); Ferialdi, PRL 116, 120402 (2016)). Based on a microscopic model, we here derive a family of Gaussian non-Markovian stochastic Schrödinger equations with a single shot measurement interpretation (arXiv:1710.08359). The different unravelings correspond to different choices of squeezed coherent states, reflecting different measurement schemes on the environment. Interesting applications for quantum information tasks in the non-Markovian regime are given. In particular, by optimizing the squeezing parameters, we can tailor unravelings for optimal entanglement bounds or for environment-assisted entanglement protection.

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