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The temporal dynamics of large quantum systems perturbed weakly by a singleexcitation can give rise to unique phenomena at the quantum phase boundaries.Here, we develop a time-dependent model to study the temporal dynamics of asingle photon interacting with a defect within a large system of interactingspin qubits (N$>$100). Our model predicts a new quantum resource, giantsusceptibility, when the system of qubits is engineered to simulate afirst-order quantum phase transition (QPT). We show that the absorption of asingle photon pulse by an engineered defect in the large qubit system cannucleate a single shot quantum measurement through spin noise read-out. Thisconcept of a single-shot detection event ("click") is different from parameterestimation which requires repeated measurements. The crucial step of amplifyingthe weak quantum signal occurs by coupling the defect to a system ofinteracting qubits biased close to a QPT point. The macroscopic change inlong-range order during the QPT generates amplified magnetic noise, which canbe read out by a classical device. Our work paves the way for studying thetemporal dynamics of large quantum systems interacting with a single-photonpulse.

Single-photon pulse induced giant response in N$>$100 qubit system