ENTANGLEMENT OF TWO COUPLED CHARGE QUBITS
Yu. A. Pashkin, Todd Tilma, D. V. Averin, O. V. Astafiev, Tsuyoshi Yamamoto, Yasunobu Nakamura, Franco Nori, Jaw-Shen Tsai · International Journal of Quantum Information · 2003
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.