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A necessary condition for incompatibility of observables in general probabilistic theories

arXiv
Authors: Sergey Filippov, Teiko Heinosaari, Leevi Leppäjärvi

Year

2016

Paper ID

43318

Status

Preprint

Abstract Read

~2 min

Abstract Words

80

Citations

N/A

Abstract

We quantify the intrinsic noise content of an observable in a general probabilistic theory and derive a noise content inequality for incompatible observables. We apply the derived inequality to standard quantum theory, the quantum theory of processes, and polytope state spaces. The noise content for positive operator-valued measures takes a particularly simple form and equals the sum of minimal eigenvalues of all the effects. We illustrate our findings with a number of examples including the introduced notion of reverse observables.

Why This Paper Matters

  • It adds a 2016 reference point for readers tracking recent quantum research.
  • We quantify the intrinsic noise content of an observable in a general probabilistic theory and derive a noise content inequality for incompatible observables.

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