Quantum Brownian motion in a general environment: Exact master equation with nonlocal dissipation and colored noise
B. L. Hu, Juan Pablo Paz, Yuhong Zhang · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 1992
We use the influence functional path-integral method to derive an exact master equation for the quantum Brownian motion of a particle linearly coupled to a general environment (ohmic, subohmic, or supraohmic) at arbitrary temperature and apply it to study certain aspects of the loss of quantum coherence.