Parametrization and Optimization of Gaussian Non-Markovian Unravelings for Open Quantum Dynamics

Nina Megier, Walter T. Strunz, Carlos Viviescas, and Kimmo Luoma
Phys. Rev. Lett. 120, 150402 – Published 13 April 2018
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Abstract

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 coherent 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 expressions 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 particular, by optimizing the squeezing parameters, we can tailor unravelings for improving entanglement bounds or for environment-assisted entanglement protection.

  • Figure
  • Received 24 October 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.150402

© 2018 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsQuantum Information, Science & Technology

Authors & Affiliations

Nina Megier1,*, Walter T. Strunz1, Carlos Viviescas2, and Kimmo Luoma1

  • 1Institut für Theoretische Physik, Technische Universität Dresden, D-01062, Dresden, Germany
  • 2Departamento de Física, Universidad Nacional de Colombia, Carrera 30 No. 45-03, Bogota D.C., Colombia

  • *nina.megier@tu-dresden.de

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Issue

Vol. 120, Iss. 15 — 13 April 2018

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