as quantum engineering. In the past two decades it has become increasingly clear that many (perhaps all) of the symptoms of classicality can be induced in quantum systems by their environments. Thus decoherence is caused by the interaction in which the environment in effect monitors certain observables of the system, destroying coherence between the pointer states corresponding to their eigenvalues. This leads to environment-induced superselection or einselection, a quantum process associated with selective loss of information. Einselected pointer states are stable. They can retain correlations with the rest of the universe in spite of the environment. Einselection enforces classicality by imposing an effective ban on the vast majority of the Hilbert space, eliminating especially the flagrantly nonlocal ''Schrodinger-cat states.'' The classical structure of phase space emerges from the quantum Hilbert space in the appropriate macroscopic limit. Combination of einselection with dynamics leads to the idealizations of a point and of a classical trajectory. In measurements, einselection replaces quantum entanglement between the apparatus and the measured system with the classical correlation. Only the preferred pointer observable of the apparatus can store information that has predictive power. When the measured quantum system is microscopic and isolated, this restriction on the predictive utility of its correlations with the macroscopic apparatus results in the effective ''collapse of the wave packet.'' The existential interpretation implied by einselection regards observers as open quantum systems, distinguished only by their ability to acquire, store, and process information. Spreading of the correlations with the effectively classical pointer states throughout the environment allows one to understand ''classical reality'' as a property based on the relatively objective existence of the einselected states. Effectively classical pointer states can be ''found out'' without being re-prepared, e.g, by intercepting the information already present in the environment. The redundancy of the records of pointer states in the environment (which can be thought of as their ''fitness'' in the Darwinian sense) is a measure of their classicality. A new symmetry appears in this setting. Environment-assisted invariance or envariance sheds new light on the nature of ignorance of the state of the system due to quantum correlations with the environment and leads to Born's rules and to reduced density matrices, ultimately justifying basic principles of the program of decoherence and einselection.

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Decoherence, einselection, and the quantum origins of the classical

To say that this is the best book on the quantum theory of fields is no praise, since to my knowledge it is the only book on this subject But it is a very good and most useful book The original was written in German and appeared in 1942 This is a translation with some minor changes A few remarks have been added, concerning meson theory and nuclear forces, also footnotes referring to modern work in this field, and finally an appendix on the symmetrization of the energy momentum tensor according to Belinfante Quantum Theory of Fields Prof Gregor Wentzel Translated from the German by Charlotte Houtermans and J M Jauch Pp ix + 224, (New York and London: Interscience Publishers, Inc, 1949) 36s

Quantum Theory of Fields

I. PRELIMINARIES 1. Two Concepts of Mind 2. Supervenience and Explanation II. THE IRREDUCIBILITY OF CONSCIOUSNESS 3. Can Consciousness be Reductively Explained? 4. Naturalistic Dualism 5. The Paradox of Phenomenal Judgment III. TOWARD A THEORY OF CONSCIOUSNESS 6. The Coherence between Consciousness and Cognition 7. Absent Qualia, Fading Qualia, Dancing Qualia 8. Consciousness and Information: Some Speculation IV. APPLICATIONS 9. Strong Artificial Intelligence 10. The Interpretation of Quantum Mechanics Notes Bibliography

The conscious mind: in search of a fundamental theory

The task of quantizing general relativity raises serious questions about the meaning of the present formulation and interpretation of quantum mechanics when applied to so fundamental a structure as the space-time geometry itself. This paper seeks to clarify the foundations of quantum mechanics. It presents a reformulation of quantum theory in a form believed suitable for application to general relativity. The aim is not to deny or contradict the conventional formulation of quantum theory, which has demonstrated its usefulness in an overwhelming variety of problems, but rather to supply a new, more general and complete formulation, from which the conventional interpretation can be deduced. The relationship of this new formulation to the older formulation is therefore that of a metatheory to a theory, that is, it is an underlying theory in which the nature and consistency, as well as the realm of applicability, of the older theory can be investigated and clarified.

"relative State" Formulation of Quantum Mechanics

Local phenomenological nucleon-nucleon potentials

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The Undivided Universe: An ontological interpretation of Quantum Theory

The purpose of this work is to resolve together four basic questions concerning the nature of nature. These questions are: (1) How is mind related to matter? (2) How is quantum theory related to reality? (3) How is relativity theory reconciled globally with that which locally we experience directly, namely the coming of reality into being or existence? (4) How is relativity theory reconciled with the apparent demand of Bell’s theorem that what happens in one spacetime region must, in certain situations, depend on decisions made in a spacelike-separated region? These four questions will be discussed in detail later. They are probably the four most fundamental questions in science.

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Mind, matter, and quantum mechanics

The results of a phase-shift analysis of proton-proton cross-section, polarization, and triple-scattering experiments at \ensuremath{\sim}310 Mev are reported. From an extensive search five satisfactory solutions have been found. Three additional solutions that give fair fits to the data are also reported.

Phase shift analysis of 310-MeV proton proton scattering experiments

Neuropsychological research on the neural basis of behaviour generally posits that brain mechanisms will ultimately suffice to explain all psychologically described phenomena. This assumption stems from the idea that the brain is made up entirely of material particles and fields, and that all causal mechanisms relevant to neuroscience can therefore be formulated solely in terms of properties of these elements. Thus, terms having intrinsic mentalistic and/or experiential content (e.g. 'feeling', 'knowing' and 'effort') are not included as primary causal factors. This theoretical restriction is motivated primarily by ideas about the natural world that have been known to be fundamentally incorrect for more than three-quarters of a century. Contemporary basic physical theory differs profoundly from classic physics on the important matter of how the consciousness of human agents enters into the structure of empirical phenomena. The new principles contradict the older idea that local mechanical processes alone can account for the structure of all observed empirical data. Contemporary physical theory brings directly and irreducibly into the overall causal structure certain psychologically described choices made by human agents about how they will act. This key development in basic physical theory is applicable to neuroscience, and it provides neuroscientists and psychologists with an alternative conceptual framework for describing neural processes. Indeed, owing to certain structural features of ion channels critical to synaptic function, contemporary physical theory must in principle be used when analysing human brain dynamics. The new framework, unlike its classic-physics-based predecessor, is erected directly upon, and is compatible with, the prevailing principles of physics. It is able to represent more adequately than classic concepts the neuroplastic mechanisms relevant to the growing number of empirical studies of the capacity of directed attention and mental effort to systematically alter brain function.

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Quantum physics in neuroscience and psychology: a neurophysical model of mind–brain interaction

Science and Human Values.- Human Knowledge as the Foundation Science.- Actions, Knowledge, and Information.- Nerve Terminals and the Need to Use Quantum Theory.- Templates for Action.- The Physical Effectiveness of Conscious Will.- Support from Contemporary Psychology.- Application to Neuropsychology.- Roger Penrose's Theory and Quantum Decoherence.- Faster-Than-Light Connections.- Whiteheadian Quantum Ontology.- An Interview.- Consciousness and the Anthropic Questions.- Impact of Quantum Mechanics on Human Values.- Conclusions.- Appendices.- Non-orthodox Versions of Quantum Theory and the Need for von Neumann's Process.- The Basis Problem in Many- Worlds Theories.- Despised Dualism.- Recent Views in Neuroscience and Philosophy.- Gazzaniga's "The Ethical Brain".- Von Neumann: Knowledge, Information, and Entropy.- Wigner's Friend and Consciousness in Quantum Physics.- Orthodox Interpretation and the Mind-Brain Connection.- Einstein Locality and Spooky Action at a Distance.- Locality in Physics.- Nonlocality in Quantum Physics.

Henry P. Stapp

Papers

The Undivided Universe: An ontological interpretation of Quantum Theory

Mind, matter, and quantum mechanics

Phase shift analysis of 310-MeV proton proton scattering experiments

Quantum physics in neuroscience and psychology: a neurophysical model of mind–brain interaction

Mindful Universe: Quantum Mechanics and the Participating Observer