Manipulating and protecting entanglement by means of spin environments

Abstract

We study the dynamical behavior of two initially entangled qubits, each locally coupled to an environment embodied by an interacting spin chain. We consider energy-exchange qubit-environment couplings resulting in a rich and highly non trivial entanglement dynamics. We obtain exact results for the time-evolution of the concurrence between the two qubits and find that, by tuning the interaction parameters, one can freeze the dynamics of entanglement, therefore inhibiting its relaxation into the spin environments, as well as activate a sudden-death phenomenon. We also discuss the effects of an environmental quantum phase transition on the features of the two-qubit entanglement dynamics.

7 pages and a bit, 7 figures, RevTeX4

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Cited by in corpus (10)

• A non-equilibrium quantum Landauer principle
• Memory-keeping effects and forgetfulness in the dynamics of a qubit coupled to a spin chain
• Propagation of non-classical correlations across a quantum spin chain
• Interaction-induced correlations and non-Markovianity of quantum dynamics
• Diagonalization of quasi-uniform tridiagonal matrices
• Sensitivity of the decay of entanglement of quantum dot spin qubits to the magnetic field
• Purifying entanglement of noisy two-qubit states via entanglement swapping
• Quantum transfer of interacting qubits
• Scale-invariant freezing of entanglement
• Bound state and Localization of excitation in many-body open systems