12 found
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  1. The Impossibility of Accurate State Self-Measurements.Thomas Breuer - 1995 - Philosophy of Science 62 (2):197-214.
    It is shown that it is impossible for an observer to distinguish all present states of a system in which he or she is contained, irrespective of whether this system is a classical or a quantum mechanical one and irrespective of whether the time evolution is deterministic or stochastic. As a corollary, this implies that it is impossible for an observer to measure the EPR-correlations between himself or herself and an outside system. Implications of the main result are discussed for (...)
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  2.  77
    Another No‐Go Theorem for Hidden Variable Models of Inaccurate Spin 1 Measurements.Thomas Breuer - 2003 - Philosophy of Science 70 (5):1368-1379.
    Uncertainty about the actual orientation of the measurement device has been claimed to open a loophole for hidden variable models of quantum mechanics. In this paper I describe the statistics of inaccurate spin measurements by unsharp spin observables. A no‐go theorem for hidden variable models of the inaccurate measurement statistics follows: There is a finite set of directions for which not all results of inaccurate spin measurements can be predetermined in a non‐contextual way. In contrast to an earlier theorem (Breuer (...)
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  3.  63
    Another No‐Go Theorem for Hidden Variable Models of Inaccurate Spin 1 Measurements.Thomas Breuer - 2003 - Philosophy of Science 70 (5):1368-1379.
    Uncertainty about the actual orientation of the measurement device has been claimed to open a loophole for hidden variable models of quantum mechanics. In this paper I describe the statistics of inaccurate spin measurements by unsharp spin observables. A no-go theorem for hidden variable models of the inaccurate measurement statistics follows: There is a finite set of directions for which not all results of inaccurate spin measurements can be predetermined in a non-contextual way. In contrast to an earlier theorem [Breuer, (...)
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  4.  7
    A Kochen-Specker Theorem for Unsharp Spin 1 Observables.Thomas Breuer - 2002 - In T. Placek & J. Butterfield (eds.), Non-Locality and Modality. Kluwer Academic Publishers. pp. 195--203.
  5.  17
    The Completeness of Scientific Theories. [REVIEW]Thomas Breuer - 1998 - Vienna Circle Institute Yearbook 5:424-429.
    Philosophy of modern physics seemed not to be among the strongholds of post-war German philosophy. As this book testifies, Martin Carrier is among the few exceptions. He makes valuable and original contributions to some important problems in philosophy of science: the theory-ladenness of observation, the possibility of universally valid theories, and the status of physical geometry. I will report first on his main theses and then point to some open problems.
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  6.  28
    Ignorance of the Own Past.Thomas Breuer - 1998 - Erkenntnis 48 (1):41-48.
    It is shown that for an inside observer it is impossible to distinguish all states in which a system was at some past time. This holds for classical and quantum systems, but an assumption of determinism is essential in the proof.
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  7.  17
    John von Neumann Met Kurt Gödel: Undecidable Statements in Quantum Mechanics.Thomas Breuer - 1999 - In Maria Luisa Dalla Chiara (ed.), Language, Quantum, Music. pp. 159--170.
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  8.  80
    Subjective Decoherence in Quantum Measurements.Thomas Breuer - 1996 - Synthese 107 (1):1 - 17.
    General results about restrictions on measurements from inside are applied to quantum mechanics. They imply subjective decoherence: For an apparatus it is not possible to determine whether the joint system consisting of itself and the observed system is in a statistical state with or without interference terms; it is possible that the apparatus systematically mistakes the real pure state of the joint system for the decohered state. We discuss the relevance of subjective decoherence for quantum measurements and for the problem (...)
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  9. Universell und unvollständig: Theorien über alles?Thomas Breuer - 1997 - Philosophia Naturalis 34 (1):1-20.
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  10.  18
    Von Neumann, Gödel and Quantum Incompleteness.Thomas Breuer - 2001 - Vienna Circle Institute Yearbook 8:75-82.
    John von Neumann was among the first to learn about Kurt Gödel’s results on the incompleteness of formal systems. Did this shape his views on the completeness of quantum mechanics? I will investigate this question from two viewpoints: von Neumann’s no-hidden-variables proof and his treatment of the quantum measurement problem.
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  11.  22
    What Theories of Everything Don't Tell.Thomas Breuer - 1997 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 28 (1):137-143.
  12.  8
    What Theories of Everything Don't Tell.Thomas Breuer - 1997 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 28 (1):137-143.
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