Algebraic Structures Arising in Axiomatic Unsharp Quantum Physics

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• 作者：Gianpiero Cattaneo and Stanley Gudder
• 刊名：Foundations of Physics
• 出版年：1999
• 出版时间：1999
• 年：1999
• 卷：29
• 期：10
• 页码：1607-1637
• 全文大小：291 KB

文摘

This article presents and compares various algebraic structures that arise in axiomatic unsharp quantum physics. We begin by stating some basic principles that such an algebraic structure should encompass. Following G. Mackey and G. Ludwig, we first consider a minimal state-effect-probability (minimal SEFP) structure. In order to include partial operations of sum and difference, an additional axiom is postulated and a SEFP structure is obtained. It is then shown that a SEFP structure is equivalent to an effect algebra with an order determining set of states. We also consider -SEFP structures and show that these structures distinguish Hilbert space from incomplete inner product spaces. Various types of sharpness are discussed and under what conditions a Brouwer complementation can be defined to obtain a BZ-poset is investigated. In this case it is shown that every effect has a best lower and upper sharp approximation and that the set of all Brouwer sharp effects form an orthoalgebra.