A three-photon KPO realizes a protected cat-qutrit manifold, with coherence shown via Rabi oscillations and Wigner tomography, plus breathing dynamics that time-domain measure the protection gap.
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Above a critical parametric drive, a cross-Kerr-coupled resonator chain enters a nonlinearity-dictated topological phase with spontaneous symmetry breaking and non-trivial bulk-boundary correspondence.
Swap tests on ancilla qubits project Fock and coherent states onto NOON and entangled coherent states inside a Mach-Zehnder interferometer, recovering Heisenberg scaling while tolerating biased ancilla phase-flip noise.
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Realisation of a Protected Cat-Qutrit Manifold via Engineered Quantum Tunnelling
A three-photon KPO realizes a protected cat-qutrit manifold, with coherence shown via Rabi oscillations and Wigner tomography, plus breathing dynamics that time-domain measure the protection gap.