The KCQ consists of the degenerate ground state manifold of the Hamiltonian
$${H}_{{{{\rm{KCQ}}}}}/\hslash=-K{a}^{{{\dagger}} 2}{a}^{2}+{\epsilon }_{2}{a}^{{{\dagger}} 2}+{\epsilon }_{2}^{*}{a}^{2},$$
(1)
where…
The KCQ consists of the degenerate ground state manifold of the Hamiltonian
$${H}_{{{{\rm{KCQ}}}}}/\hslash=-K{a}^{{{\dagger}} 2}{a}^{2}+{\epsilon }_{2}{a}^{{{\dagger}} 2}+{\epsilon }_{2}^{*}{a}^{2},$$
(1)
where…