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In this paper we review the theory of open quantum systems and macroscopicquantum electrodynamics, providing a self-contained account of many aspects ofthese two theories. The former is presented in the context of a qubit coupledto a electromagnetic thermal bath, the latter is presented in the context of aquantization scheme for surface-plasmon polaritons (SPPs) in graphene based onLangevin noise currents. This includes a calculation of the dyadic Green'sfunction (in the electrostatic limit) for a Graphene sheet between twosemi-infinite linear dieletric media, and its subsequent application to theconstruction of SPP creation and annihilation operators. We then bring the twofields together and discuss the entanglement of two qubits in the vicinity of agraphene sheet which supports SPPs. The two qubits communicate with each othervia the emission and absorption of SPPs. We find that a Sch\"odinger cat stateinvolving the two qubits can be partially protected from decoherence by takingadvantage of the dissipative dynamics in graphene. A comparison is also drawnbetween the dynamics at zero temperature, obtained via Schrodinger's equation,and at finite temperature, obtained using the Lindblad equation.

Two-level Systems Coupled to Graphene plasmons: A Lindblad equation approach