Quantum Bayes rule
- 13 June 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 64 (1) , 014305
- https://doi.org/10.1103/physreva.64.014305
Abstract
We state a quantum version of the Bayes 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.Keywords
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