Only recently, however, has quantum Darwinism been put to the experimental test. Nielsen, M. If the spin of one electron is measured, it can be spin up or spin down, with both having the same probability. PMID It is in this sense that the pointer states of classical reality are selected from quantum reality and exist in the macroscopic realm in a state able to undergo further evolution. E-mail newsletter. Perhaps of equal significance to the light this theory shines on quantum explanations is its identification of a Darwinian process operating as the selective mechanism establishing our classical reality. Quantum theory has traditionally treated this problem as being resolved by a non- unitary transformation of the state vector at the time of measurement into a definite state. You are using a browser version with limited support for CSS.