Before revision: By differentiating the current equation and using substitution, one obtains the Josephson inductance term : From these equations, the Josephson Inductance term is non-linear ; because of this, the energy level spacings are no longer degenerate, restricting the dynamics of the system to the two qubit states.
After revision: it can be seen thatfrom the cosine term in the denominatorBy differentiating the current equation and using substitution, one obtains the Josephson inductance term : From these equations, the Josephson Inductance term is non-linear ; because of this, the energy level spacings are no longer degenerate, restricting the dynamics of the system to the two qubit states.