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Journal of the Korean Physical Society

Manipulating the Sudden Death of Entanglement in Two-qubit Atomic Systems

Mahmood Irtiza Hussain, Rabia Tahira, Manzoor Ikram

Published Oct 14, 2011• 11 citations
Publisher
DOI
10.3938/jkps.59.2901

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Manipulation of sudden death of entanglement (ESD) of two qubits interacting with statistically uncorrelated thermal reservoirs is investigated. It is shown that for initially prepared X-states of the two qubits a simple (necessary and sufficient) criterion for ESD can be derived with the help of the Peres–Horodecki criterion. It is shown analytically that, in contrast to the zero-temperature case, at finite temperature of at least one of the reservoirs all initially prepared two-qubit X-states exhibit ESD. General conditions are derived under which ESD can be hastened, delayed or averted.
We investigate the entanglement dynamics of the bipartite system, consisting of two interacting two-level atoms in QED, which are driven additionally by coherent double ultrashort laser pulses characterized by various phase differences. Results show that the relative phase difference can exert significant influence on the entanglement evolution, such as delaying or accelerating entanglement sudden death and recurrence (ESD and ESR). Furthermore, with the increase of detuning, ESD and ESR disappear, irrespective of various phase differences. Our analysis is helpful in manipulating entanglement.