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Developed originally for the Holstein polaron, the Davydov D1 ansatz is anefficient, yet extremely accurate trial state for time-dependent variation ofthe spin-boson model [J. Chem. Phys. 138, 084111 (2013)]. In this work, theDirac-Frenkel time-dependent variational procedure utilizing the Davydov D1ansatz is implemented to study entanglement dynamics of two qubits under theinfluence of two independent baths. The Ohmic spectral density is used withoutthe Born-Markov approximation or the rotating-wave approximation. In the strongcoupling regime finite-time disentanglement is always found to exist, while atthe intermediate coupling regime, the entanglement dynamics calculated byDavydov D1 ansatz displays oscillatory behavior in addition to entanglementdisappearance and revival.

Entanglement dynamics of a two-qubit system coupled individually to Ohmic baths