Published in
World Scientific Publishing, International Journal of Quantum Information, 04(01), p. 421-426
DOI: 10.1142/s0219749903000334
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Entanglement of Two Coupled Charge Qubits
Journal article published in 2003 by
Y.-U. A. Pashkin 
,
T. Tilma,
D. V. Averin,
O. Astafiev,
T. Yamamoto,
Y. Nakamura,
F. Nori,
J. S. Tsai
,
T. Tilma,
D. V. Averin,
O. Astafiev,
T. Yamamoto,
Y. Nakamura,
F. Nori,
J. S. Tsai
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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.