Entanglement Dynamics in Open Two-Qubit Systems via Diffusive Quantum Trajectories

Carlos Viviescas, Ivonne Guevara, André R. R. Carvalho, Marc Busse, and Andreas Buchleitner
Phys. Rev. Lett. 105, 210502 – Published 17 November 2010

Abstract

We use quantum diffusive trajectories to prove that the time evolution of two-qubit entanglement under spontaneous emission can be fully characterized by optimal continuous monitoring. We analytically determine this optimal unraveling and derive a deterministic evolution equation for the system’s concurrence. Furthermore, we propose an experiment to monitor the entanglement dynamics in bipartite two-level systems and to determine the disentanglement time from a single trajectory.

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  • Received 8 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.210502

© 2010 The American Physical Society

Authors & Affiliations

Carlos Viviescas1, Ivonne Guevara1, André R. R. Carvalho2, Marc Busse3, and Andreas Buchleitner4

  • 1Departamento de Física, Universidad Nacional de Colombia, Carrera 30 No. 45-03 Edificio 404, Bogotá D.C., Colombia
  • 2Australian Centre for Quantum-Atom Optics, Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200, Australia
  • 3Institut für Theoretische Physik, Ludwig-Maximilians-Universität München, Theresienstrasse 33, D-80033 München, Germany
  • 4Physikalisches Institut der Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany

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Issue

Vol. 105, Iss. 21 — 19 November 2010

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