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We investigate the decay of two-qubit entanglement caused by the influence ofclassical noise. We consider the whole spectrum of cases ranging fromindependent to fully correlated noise affecting each qubit. We take intoaccount different spatial symmetries of noises, and the regimes of noiseautocorrelation time. The latter can be either much shorter than thecharacteristic qubit decoherence time (Markovian decoherence), or much longer(approaching the quasi-static bath limit). We express the entanglement oftwo-qubit states in terms of expectation values of spherical tensor operatorswhich allows for transparent insight into the role of the symmetry of both thetwo-qubit state and the noise for entanglement dynamics.

The dynamics of two entangled qubits exposed to classical noise: role of spatial and temporal noise correlations