Phase information beyond entanglement sudden death in coherence-to-entanglement conversion under post-gate noise

arXiv:2608.19247v1 Announce Type: new Abstract: An ideal CNOT maps the phase of a coherent qubit onto the coherence between $\ket{00}$ and $\ket{11}$ of a two-qubit state, producing an output that carries both entanglement and estimable phase information. We ask how post-gate noise degrades these t