The paper derives the Fokker-Planck equation from Schrödinger dynamics only by assuming away quantum coherences, reproducing standard master-equation results.
(6) Equation ( 6) is more concisely written as |ψ(t)⟩ =U |ψ(0)⟩ (7) whereU is the unitary time evolution operator satisfying UU † =I (8) and I is the identity matrix
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Derivation of Fokker-Planck equation from Schrodinger dynamics
The paper derives the Fokker-Planck equation from Schrödinger dynamics only by assuming away quantum coherences, reproducing standard master-equation results.