Decoherence and entanglement of a pair of coupled qubits

We analyze the quantum dynamics of a pair of qubits coupled via Ising-type coupling under the influence of a common dissipative bath. We present results of simulations for a range of system biases and spin-spin couplings at two values of bath temperature ($\beta =1,5)$. We also discuss the dynamics of entanglement when starting with fully entangled states and find that for some values of the system parameters, steady-state entanglement is observed. These simulations are carried out via the iterative path integral methodology developed earlier in our group which delivers efficient, numerically exact long time quantum dynamics.