Coherent Exchange and Decoherence in Dirac-Spin-Liquid Quantum Interconnects

We develop a susceptibility-based open-system theory for two localized qubits coupled through a candidate two-dimensional U(1) Dirac-spin-liquid-like bath. The central input is the gauge-invariant retarded physical spin susceptibility Chi^R(q,ω) of the bath. We show that this single response kernel controls both coherent and dissipative qubit dynamics: its real part generates the nonlocal mediated exchange, while its absorptive part determines relaxation and dephasing through the equilibrium noise spectrum. This gives a unified reduced two-qubit description in which the usefulness of the bath as an entanglement bus is governed by the competition between susceptibility-mediated exchange and bath-induced decoherence. As an analytically transparent benchmark, we evaluate the spinon mean-field Dirac susceptibility and recover the static algebraic exchange J_eff(R)propto J_{rm local}²/\(v_F R³\), together with pseudogap-suppressed relaxation Γ_1propto J_{rm local}²ω₀³/v_F⁴. We then formulate a beyond-mean-field extension in which gauge-field dressing and other interaction effects are absorbed into a dressed physical susceptibility, without changing the reduced qubit-sector mapping. The resulting framework provides a direct route from the many-body spin response of a correlated two-dimensional bath to reduced-dynamics simulations of entanglement generation, coherence loss, and the operational phase space of a candidate Dirac spin-liquid quantum interconnect.