A non-unitary similarity deformation of a Hermitian two-qubit Hamiltonian keeps the degenerate spectrum fixed while right eigenstates interpolate from product to maximally entangled, with Schmidt-gauged magic peaking at intermediate coupling.
(127), reshape every state as anN × Mcoefficient matrixC, and computeρ A =CC †/Tr(CC †)
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Entanglement and non-local magic in a non-unitarily deformed non-Hermitian bipartite system
A non-unitary similarity deformation of a Hermitian two-qubit Hamiltonian keeps the degenerate spectrum fixed while right eigenstates interpolate from product to maximally entangled, with Schmidt-gauged magic peaking at intermediate coupling.