2009/01/23 by Georges Parfionov, Parfionov, Georges, Romàn R. Zapatrin +1
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.0901.3771
11 pages, LaTeX. Talk presented at Quantum Structures - 2008 (July 6-12, 2008, Sopot, Poland)
arxiv created 2009/01/23 · arxiv updated 2009/12/01
For a mixed quantum state with density matrix ρ there are infinitely many ensembles of pure quantum states, which average to ρ. Starting from Laplace principle of insufficient reason (not to give a priori preference to any particular state), we derive a `natural' distribution of pure states averaging to ρ, which is `more spread' than all the others.