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Gregg Jaeger
Boston University
  1. Unsharp Quantum Reality.Paul Busch & Gregg Jaeger - 2010 - Foundations of Physics 40 (9-10):1341-1367.
    The positive operator (valued) measures (POMs) allow one to generalize the notion of observable beyond the traditional one based on projection valued measures (PVMs). Here, we argue that this generalized conception of observable enables a consistent notion of unsharp reality and with it an adequate concept of joint properties. A sharp or unsharp property manifests itself as an element of sharp or unsharp reality by its tendency to become actual or to actualize a specific measurement outcome. This actualization tendency—or potentiality—of (...)
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  2.  8
    Quantum Unsharpness, Potentiality, and Reality.Gregg Jaeger - 2019 - Foundations of Physics 49 (6):663-676.
    Paul Busch argued that the positive operator measure, a generalization of the standard quantum observable, enables a consistent notion of unsharp reality based on a quantifiable degree of reality whereby systems can possess generalized properties jointly, whereas related sharp properties cannot be so possessed. Here, the work leading up to the formalization of this notion to which he made great contributions is reviewed and explicated in relation to Heisenberg’s notions of potentiality and actuality. The notion of unsharp reality is then (...)
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  3.  36
    Individuation in Quantum Mechanics.Gregg Jaeger - 2011 - Foundations of Physics 41 (3):299-304.
    It has been claimed that the Principle of the Identity of Indiscernibles (PII) is incompatible with quantum mechanics, considered as a complete theory. Van Fraassen has argued specifically that a conflict between the two arises due to the requirements of Bose-Einstein statistics when imposed on two-particle quantum states. It is shown here that this apparent contradiction of the PII with quantum mechanics can be removed by the introduction of a natural criterion of individuality.
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  4.  37
    Individuation in Quantum Mechanics and Space-Time.Gregg Jaeger - 2010 - Foundations of Physics 40 (9-10):1396-1409.
    Two physical approaches—as distinct, under the classification of Mittelstaedt, from formal approaches—to the problem of individuation of quantum objects are considered, one formulated in spatiotemporal terms and one in quantum mechanical terms. The spatiotemporal approach itself has two forms: one attributed to Einstein and based on the ontology of space-time points, and the other proposed by Howard and based on intersections of world lines. The quantum mechanical approach is also provided here in two forms, one based on interference and another (...)
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  5.  51
    Coherence, Entanglement, and Reductionist Explanation in Quantum Physics,".Gregg Jaeger & Sahotra Sarkar - 2003 - In A. Ashtekar (ed.), Revisiting the Foundations of Relativistic Physics. D. Reidel. pp. 523--542.
    The scope and nature of reductionist explanation in quantum physics is analyzed, with special attention being paid to the situation in quantum physics.
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  6.  96
    Finite-Time Destruction of Entanglement and Non-Locality by Environmental Influences.Kevin Ann & Gregg Jaeger - 2009 - Foundations of Physics 39 (7):790-828.
    Entanglement and non-locality are non-classical global characteristics of quantum states important to the foundations of quantum mechanics. Recent investigations have shown that environmental noise, even when it is entirely local in influence, can destroy both of these properties in finite time despite giving rise to full quantum state decoherence only in the infinite time limit. These investigations, which have been carried out in a range of theoretical and experimental situations, are reviewed here.
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  7.  70
    An Extremum Principle for a Neutron Diffraction Experiment.Gregg Jaeger & Abner Shimony - 1999 - Foundations of Physics 29 (3):435-444.
    An extremum principle was postulated by Horne, Finkelstein, Shull, Zeilinger, and Bernstein in order to derive the physically allowable parameters for sinusoidal standing waves governing a neutron in a crystal which is immersed in a strong external magnetic field: “the expectation value of the total potential 〈V〉 is an extremum.” We show that this extremum principle can be obtained from the variational principle used by Schrodinger to derive his nonrelativistic wave equation. We rederive the solutions found by the above-mentioned authors (...)
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  8.  26
    Bohmian Mechanics and Quantum Theory.Gregg Jaeger - 2000 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 31 (1):105-108.
  9.  34
    On the Identification of the Parts of Compound Quantum Objects.Gregg Jaeger - 2014 - Foundations of Physics 44 (7):709-724.
    A view of the constitution of quantum objects as reducible, in the sense of being decomposable to elementary particles, is outlined. On this view, parts of composite quantum systems are considered to be identified according to a recently introduced, specifically quantum notion of individuation (Jaeger, Found Phys 40:1396 2010). These parts can typically also be considered particles according to Wigner’s symmetry-based notion. Particles are considered elementary when they satisfy a condition of elementarity, newly introduced here, that improves on that provided (...)
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  10.  19
    Measurement and Fundamental Processes in Quantum Mechanics.Gregg Jaeger - 2015 - Foundations of Physics 45 (7):806-819.
    In the standard mathematical formulation of quantum mechanics, measurement is an additional, exceptional fundamental process rather than an often complex, but ordinary process which happens also to serve a particular epistemic function: during a measurement of one of its properties which is not already determined by a preceding measurement, a measured system, even if closed, is taken to change its state discontinuously rather than continuously as is usual. Many, including Bell, have been concerned about the fundamental role thus given to (...)
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  11.  22
    Generalized Quantum Probability and Entanglement Enhancement Witnessing.Gregg Jaeger - 2012 - Foundations of Physics 42 (6):752-759.
    It has been suggested (cf. Sinha et al. in Science 329:418, 2010) that the Born rule for quantum probability could be violated. It has also been suggested that, in a generalized version of quantum mechanical probability theory such as that proposed by Sorkin (Mod. Phys. Lett. A 9:3119, 1994) there might occur deviations from the predictions of quantum probability in cases where more than two paths are available to a self-interfering system. These would lead to additional contributions to interference. Here, (...)
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  12.  31
    Welcher-Weg Experiment (Compendium Entry).Paul Busch & Gregg Jaeger - unknown
    This is an entry to the Compendium of Quantum Physics, edited by F Weinert, K Hentschel and D Greenberger, to be published by Springer-Verlag.
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  13.  43
    Philosophy of Quantum Information and Entanglement.Alisa Bokulich & Gregg Jaeger (eds.) - 2010 - Cambridge University Press.
    "Entanglement can be understood as an extraordinary degree of correlation between states of quantum systems - a correlation that cannot be given an explanation ...
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  14. Advances in Quantum Theory: Proceedings of the International Conference on Advances in Quantum Theory, Växjö, Sweden, 14-17 June 2010. [REVIEW]Gregg Jaeger (ed.) - 2011 - American Institute of Physics.
    Decoherence and entanglement : new concepts and perspectives -- Quantum-like models in cognitive science and economics -- Invited presentations -- Contributed presentations -- Post-conference papers.
     
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