What quantum state really is?
  To get out of logical deadlock in interpreting gedanken experiments like Schrodinger cat, actual meaning of a wave function, or a state, in the case of complex two-dimensional Hilbert space, is shown to represent transformations executing by elements of even subalgebra of geometric algebra over three-dimensional Euclidian space. 
Alexander M. Soiguine
physics.gen-ph quant-ph