Entanglement of two coupled charged qubits

PASHKIN, YU. A. and TILMA, T. and AVERIN, D. V. and ASTAFIEV, O. and YAMAMOTO, T. and NAKAMURA, Y. and NORI, F. and TSAI, J. S. (2003) Entanglement of two coupled charged qubits. International Journal of Quantum Information, 1 (4). pp. 421-426. ISSN 0219-7499

Abstract

We have analyzed the entanglement of a system of two coupled charge qubits. We calculate the amount of entanglement using several different approaches. We show that in the ideal case the system remains entangled most of the time and the amount of entanglement reaches almost unity, i.e. the system becomes maximally entangled at certain instances.