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We in this paper study quantum correlations for two neutral spin-particlescoupled with a single-mode optical cavity through the usual magneticinteraction. Two-spin entangled states for both antiparallel and parallelspin-polarizations are generated under the photon coherent-state assumption.Based on the quantum master equation we derive the time-dependent quantumcorrelation of Clauser-Horne-Shimony-Holt (CHSH) type explicitly in comparisonwith the well known entanglement-measure concurrence. In the two-spin singletstate, which is recognized as one eigenstate of the system, the CHSHcorrelation and concurrence remain in their maximum values invariant with timeand independent of the average photon-numbers either. The correlation variesperiodically with time in the general entangled-states for the low averagephoton-numbers. When the photon number increases to a certain value theoscillation becomes random and the correlations are suppressed below the Bellbound indicating the decoherence of the entangled states. In the highphoton-number limit the coherence revivals periodically such that the CHSHcorrelation approaches the upper bound value at particular time pointsassociated with the cavity-field period

Entanglement Dynamics for Two Spins in an Optical Cavity---Field Interaction Induced Decoherence and Coherence Revival