Open AccessControlling the entanglement among three atoms by quantum-jump-based feedback
Author(s) -
Yu Chen,
Jian Zou,
Jungang Li,
Bin Shao
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.8365
Subject(s) - quantum decoherence , physics , quantum entanglement , subspace topology , quantum mechanics , jump , quantum , state (computer science) , statistical physics , computer science , mathematics , mathematical analysis , algorithm
We consider a model consisting of three two-level atoms in a heavily damped cavity. We show that the quantum-jump-based feedback can be used to generate a steady entangled state of three atoms against decoherence. When the feedback acts on just one of the atoms, it can protect a maximally entangled state of other two atoms. When the feedback acts on three atoms, by choosing appropriate parameters we can obtain a decoherence-free subspace spanned by two vectors, and by using quantum trajectory Monte Carlo wave function method we find that the maximally entangled state of three atoms in this decoherence-free subspace can be obtained for some specific initial conditions.