%0 Journal Article
%T Quantum Bayes rule
%A Ruediger Schack
%A Todd A. Brun
%A Carlton M. Caves
%J Physics
%D 2000
%I arXiv
%R 10.1103/PhysRevA.64.014305
%X We state a quantum version of Bayes's rule for statistical inference and give a simple general derivation within the framework of generalized measurements. The rule can be applied to measurements on N copies of a system if the initial state of the N copies is exchangeable. As an illustration, we apply the rule to N qubits. Finally, we show that quantum state estimates derived via the principle of maximum entropy are fundamentally different from those obtained via the quantum Bayes rule.
%U http://arxiv.org/abs/quant-ph/0008113v1