An open-quantum-systems analysis of a dressed qubit (a spinless fermion hopping between two lattice sites) strongly coupled to a collective bosonic bath. The Lang-Firsov polaron transformation reduces the strong system-bath coupling; in the polaron frame with an Ohmic spectral density and Gaussian cutoff, a quantum master equation in the energy eigenbasis (fixed particle number, Markovian regime) yields a fundamental timescale governing coherence decay — coherence survives for small values and is lost for larger ones — and pi-pulse control is used to suppress decoherence.
This paper studies the decoherence dynamics of a 'dressed qubit' realized as a spinless fermion hopping between two lattice sites, each strongly coupled to a collective bosonic bath. To handle the st…