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Improved convergence radius of the Fer expansion for Hermitian generators

Bagnasacco, Lorenzo et al.
arXiv (All) · Papers
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mathematical-physicsquantum-physics
The Dyson series expands the propagator of a time-dependent Hamiltonian in powers of the Hamiltonian, but its truncations are in general not unitary. The Fer expansion writes the same propagator as an infinite product of matrix exponentials, each of them unitary, and its remainder decays doubly expo
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