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## Crypto-unitary quantum evolution operators

Miloslav Znojil

For the description of quantum evolution, the use of a manifestly time-dependent quantum Hamiltonian $$\mathfrak{h}(t) =\mathfrak{h}^\dagger(t)$$ is shown equivalent to the work with its simplified, time-independent alternative $$G\neq G^\dagger$$. A tradeoff analysis is performed recommending the latter option. The physical unitarity requirement is shown fulfilled in a suitable ad hocrepresentation of Hilbert space.

http://arxiv.org/abs/1204.5989
Quantum Physics (quant-ph); General Relativity and Quantum Cosmology (gr-qc)