Dual Instruments and Sequential Products of Observables

• URL: http://arxiv.org/abs/2208.07923v1
• Date: Tue, 16 Aug 2022 19:44:45 GMT
• Title: Dual Instruments and Sequential Products of Observables
• Authors: Stan Gudder
• Abstract summary: We show that every operation possesses a unique dual operation and measures an unique effect. We extend this work to the theory of instruments and observables.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We first show that every operation possesses an unique dual operation and measures an unique effect. If $a$ and $b$ are effects and $J$ is an operation that measures $a$, we define the sequential product of $a$ then $b$ relative to $J$. Properties of the sequential product are derived and are illustrated in terms of L\"uders and Holevo operations. We next extend this work to the theory of instruments and observables. We also define the concept of an instrument (observable) conditioned by another instrument (observable). Identity, state-constant and repeatable instruments are considered. Sequential products of finite observables relative to L\"uders and Holevo instruments are studied.

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