We use numerically exact iterative path integral methods to investigate the decoherence and entanglement dynamics of a tunneling pair of two coupled qubits (spins) system interacting with a dissipative bath. We find that decoherence is generally accompanied by the destruction of entanglement, although the specifics of this destruction depend sensitively on the parameters of the Hamiltonian (qubit-qubit coupling and/or energy bias), the strength of dissipation, the temperature, and the choice of initial condition. We also observe that dissipation can in some cases generate a substantial amount of entanglement. Finally, if an entangled eigenstate exists which does not couple to the environment, the long-time entanglement can significantly exceed the value corresponding to the Boltzmann equilibrium state.
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Research Article| March 20 2013
Tunneling, decoherence, and entanglement of two spins interacting with a dissipative bath
Mohammad M. Sahrapour;
Mohammad M. Sahrapour, Nancy Makri; Tunneling, decoherence, and entanglement of two spins interacting with a dissipative bath. J. Chem. Phys. 21 March 2013; 138 (11): 114109. https://doi.org/10.1063/1.4795159
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