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The Heisenberg-Langevin equations are equations for open quantum system. They are a specific case of Quantum Langevin equations.
In the Heisenberg picture the time evolution of a quantum system is in the operators. The Heisenberg equation of motion determines the evolution of the operators. The Heisenberg-Langevin equation is the generalization of this to open quantum system.[1][2]
References
^Gardiner, Crispin (2000). Quantum Noise. Springer. p. 42.
^Scully, Marlan O.; Zubairy, M. Suhail (1997). Quantum Optics. Cambridge. p. 271.
