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Abstract: The concept of time delayed creation of entanglement by the dissipativeprocess of spontaneous emission is investigated. A threshold effect for thecreation of entanglement is found that the initially unentangled qubits can beentangled after a finite time despite the fact that the coherence between thequbits exists for all times. This delayed creation of entanglement, that wecall sudden birth of entanglement, is opposite to the currently extensivelydiscussed sudden death of entanglement and is characteristic for transientdynamics of one-photon entangled states of the system. We determine thethreshold time for the creation of entanglement and find that it is related totime at which the antisymmetric state remains the only excited state beingpopulated. It is shown that the threshold time can be controlled by thedistance between the qubits and the direction of initial excitation relative tothe interatomic axis. This effect suggests a new alternative for the study ofentanglement and provides an interesting resource for creation on demand ofentanglement between two qubits.

Author: Z. Ficek, R. Tanas



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