Delayed sudden birth and sudden death of entanglement in Josephson-charge qubits

Distinctive features of the entanglement dynamics of a circuit containing two-coupled superconducting charge qubits are explored. The striking effects of junction coupling on the entanglement are presented in terms of the concurrence. We also point out the importance effects of initial state selection for obtaining different features of entanglement, such as, sudden death and sudden birth. Original Text ? Astro, Ltd., 2009. The article is published in the original.