Quantum electronics III. volumes I and II

N. David Mermin

These are volumes II and III of Sir Karl Popper's hitherto unpublished Postscript to the Logic of Scientific Discovery. In addition to the Postscript itself, which was largely completed twenty years after L.S.D. in 1954, about a third of each volume is devoted to more recent writings. Volume II, The Open Universe , subtitled “An argument for Indeterminism”, has three “addenda”: a reprint of Popper's 1973 essay, “Indeterminism is not enough”, a revised version of his 1974 “Scientific Reduction and the essential incompleteness of all science”, and a brief essay, “Further remarks on reduction”, written in 1981. Volume III, Quantum Theory and the Schism in Physics , has a lengthy 1982 preface, and contains a revised and expanded version of Popper's 1967 “Quantum mechanics without the observer”. It was not Popper's original intent that the work should appear in separate volumes. Volume II, though primarily about classical physics, bears importantly on his views of the quantum theory, and further discussions of classical concepts (notably entropy and irreversibility) are in Volume III. I shall therefore discuss the two books as a single coherent work. (Volume I, Realism and the Aim of Science , was unavailable at the time this review was written.) Popper argues with wit, ingenuity, and passion, that the prevailing “Copenhagen” interpretation of the quantum theory is a mistake. Heisenberg, he says, “led a generation of physicists to accept the absurd view that one can learn from quantum mechanics that ‘objective reality has evaporated’” (III p. 9). According to Popper, there really are particles out there, not “wavicles”, and each particle has both a position and a momentum.

Arthur Maitland

L. Allen

Henry Mehlberg, Robert S. Cohen

III: An Indeterministic Theory of Time.- I. Philosophical Interpretations of Quantum Physics.- II. The Problem of Causality in an Indeterministic Science.- III. Relativity and the Atom.- IV. Laws of Nature and Time's Arrow.- V. The Symmetry of Time and the Branch Hypothesis.- IV: Universal Aspects of Time.- I. The Measurement of Time.- II. The Ontological Status of Time.- III. The Reality of Time.- IV. The Causal Nature of Time.- V. The Symmetry of Time.- VI. The Psychology of Time.- Conclusion.- Bibliography of Works Cited In Volumes One and Two.- Bibliography Of Writings Of Henry Mehlberg.- Index Of Names To Volumes One And Two.

Syed Muntasir Mamun

This volume examines physical platforms capable of natively implementing the symplectic circuit model developed in Volumes II and III. We analyze four principal hardware families: (i) coupled nonlinear oscillators (mechanical, Josephson-junction, and LC circuits), (ii) optomechanical arrays, (iii) analog electronic networks employing gyrators and transformers, and (iv) cold-atom systems operated in the classical regime. For each platform we derive the effective symplectic Hamiltonian, identify the native nS gate operations realizable via control fields, and evaluate energy efficiency and noise resilience relative to superconducting or tio uta trapped-ion quantum hardware. Because the underlying state space remains 2n-dimensional (linear in the number of symbits), mp o cC these analog machines avoid the exponential overhead of quantum state preparation and coherence maintenance. We show thatplecti ym S for workloads such as classical Hamiltonian simulation, geometric optimization on symplectic manifolds, and Nhybrid | CC quantum-symplectic signal processing, analog symplectic platforms can offer superior energy per operation (potentially KS 10²–10⁴ lower than fault-tolerant quantum) and room-temperature operation with robustness to decoherence. Challenges of precision, scalability, and readout are quantified. Also available on Academia.edu: https://www.academia.edu/attachments/133167960/download_file?s=portfolio

P. Grivet, N. Bloembergen