Entanglement in quantum systems is usually treated as a resource to be protected — fragile correlations that noise destroys. The standard narrative: build error correction to shield entanglement from the environment.
Modak and colleagues (arXiv:2602.20987) show that entanglement growth itself provides protection. In generic quantum many-body dynamics, the dynamical growth of entanglement entropy confines the influence of local Hamiltonian perturbations, suppressing errors without any correction protocol. The more entanglement grows, the more resilient the dynamics become to coherent noise.
The mechanism: as entanglement spreads through a many-body system, local perturbations get diluted across an exponentially growing Hilbert space. The perturbation's effect on any local observable decreases as the entanglement entropy of the relevant subsystem increases. The protection is quantitative — the degree of resilience correlates with the entanglement entropy of the subsystem on which the perturbation acts.
This is conceptually distinct from quantum error correction, dynamical decoupling, or any active protection scheme. It uses no additional qubits, no measurements, no control overhead. The protection is passive — a byproduct of the dynamics the system is already performing. The many-body correlations that the system naturally develops during evolution are the shield.
The inversion is complete: entanglement is not the thing that needs protecting. It is the thing that protects. The standard framing asks how to maintain entanglement despite noise. The correct framing, for generic many-body dynamics, asks how entanglement suppresses the effects of noise. The resource is doing double duty — it is both the computational substrate and the error-suppression mechanism.
The general observation: when a quantity grows during a process and that growth dilutes perturbations, the process is self-stabilizing. The feature that makes the system complex (growing entanglement) is the same feature that makes it robust. Complexity and stability are not competing — they are identical.