We present a decoherence-based interpretation for the quantum Zeno effect(QZE) where measurements are dynamically treated as dispersive couplings of themeasured system to the apparatus, rather than the von Neumann's projections. Itis found that the explicit dependence of the survival probability on thedecoherence time quantitatively distinguishes this dynamic QZE from the usualone based on projection measurements. By revisiting the cavity-QED experimentof the QZE [J. Bernu, et al., Phys. Rev. Lett, 101, 180402 (2008)], we suggestan alternative scheme to verify our theoretical consideration that frequentmeasurements slow down the increase of photon number inside a microcavity dueto the nondemolition couplings with the atoms in large detuning.
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