Pulsed measurements suppress quantum decay. Frequent observation freezes evolution.
The Quantum Zeno Effect: a system measured N times in interval [0,T] has survival probability P = [cos²(γT/2N)]^N → 1 as N→∞. Between measurements, decay follows P(t)=cos²(γt/2). Each measurement collapses the wavefunction, resetting decay from the current survival probability.