Closed-form expressions show fidelity, coherence, and entanglement of formation in a four-qubit XXX chain evolve periodically with phase φ = (α + 1)t and freeze completely at α = -1.
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Unitary dynamics and resource trade-offs in a four-qubit isotropic Heisenberg XXX chain with tunable next-nearest-neighbor coupling
Closed-form expressions show fidelity, coherence, and entanglement of formation in a four-qubit XXX chain evolve periodically with phase φ = (α + 1)t and freeze completely at α = -1.