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| \begin{align*} | |
| ground state is two-fold degenerate, and when \(B > \text{Bump}\) the ground state becomes non-degenerate and the corre- \\ | |
| spending wave function is given by \\ | |
| \begin{equation} | |
| \left[| \text{voltage} \rangle = - \frac{1}{\sqrt{2}}| \text{1} \rangle, \end{equation} | |
| \end{align*} | |
| which is obviously of no entanglement. Then, the ground- state negativity forms a plateau when \(B < \text{Bump}\). The jump of negativity at \(B = \text{Bump}\) is due to the level crossing. For instance, for \(N = 4\), there are two level crossings, and the entanglement displays two jumps. | |