Quantum coherences are usually defined as the offdiagonal elements of the density matrix σ(t) expressed in a given basis. For molecular quantum dynamics, it is useful to think about coherences in the energy basis σ eg (t) = ⟨e| σ(t) |g⟩ between an electronic ground |g⟩ and excited state |e⟩ as they lead to quantum beatings that are visible in laser spectroscopies. During decoherence electronic superposition states with density matrix σ = |ψ⟩⟨ψ|, where |ψ⟩ = c g |g⟩ + c e |e⟩, decay to a statistical mixture of states σ(t) = p g |g⟩ ⟨g| + p e |e⟩ ⟨e| where p i ≥ 0 are the state populations. This decay is ubiquitous and arises due to the interaction of the electrons with the surrounding nuclei (vibrations, torsions, and solvent). At zero temperature, electronic decoherence is understood as arising due to nuclear wavepacket evolution in alternative potential surfaces. In this view, the wavefunction of electrons and their nuclear environment is in an entangled state |Ψ(t)⟩ = |g⟩ |χ g (t)⟩ + |e⟩ |χ e (t)⟩, where |χ n ⟩ is the nuclear wavepacket evolving in the ground n = g or excited n = e potential energy surface E n (x) and {x} are the nuclear coordinates. In this case, the electronic coherences σ eg (t) = ⟨χ e (t)| χ g (t)⟩ decay with the overlap between the nuclear wavepackets in the ground and excited state. At finite temperatures T , for early times t the electronic coherences