”I re-experience once again the stimulating atmosphere of each of the ISQMs: There were theoretical discussions in diverse frontier areas of physics as well as descriptions of beautiful new (or planned) experiments and technologies. From each of the Symposia I always came away with the exciting feeling of how wonderful physics is and how lucky it is to be a physicist in this era.”Chen Ning YangThis volume is selected from the First through Fourth International Symposia on Foundations of Quantum Mechanics. The International Symposia on Foundations of Quantum Mechanics in the Light of New Technology (ISQMs) provide a unique interdisciplinary forum where distinguished theorists and experimentalists of diverse fields of research gather to discuss basic problems in quantum mechanics in the light of new technology. This volume collects 51 papers selected from over 200 papers by many distinguished scientists. It includes articles by C N Yang, J A Wheeler, Y Nambu, L Esaki and M P A Fisher, to name just a few, and contains topics ranging from quantum measurements to quantum cosmology.Contents:Proceedings of the First International Symposium (S Kamefuchi et al.):Gauge Fields, Electromagnetism and the Bohm–Aharonov Effect (C N Yang)Non-Local Phenomena and the Aharonov–Bohm Effect (Y Aharonov)Electron Holography, Aharonov–Bohm Effect and Flux Quantization (A Tonomura et al.)The Superposition Principle in Macroscopic Systems (A J Leggett)and other papersProceedings of the Second International Symposium (M Namiki et al.):Quantum Measurements in Neutron Interferometry (H Rauch)The Two-Photon Polarisation Correlation of Metastable Hydrogen as Test between Quantum Mechanics and Local Realistic Theories (H Kleinpoppen)Proof of the Aharonov–Bohm Effect with Completely Shielded Magnetic Field (A Tonomura et al.)Fractional Quantum Statistics in Two-Dimensional Systems (Y-S Wu)and other papersProceedings of the Third International Symposium (S Kobayashi et al.):Optical Manifestations of Berry's Topological Phases: Aharonov–Bohm-like Effects for the Photon (R Y Chiao)High Precision Determination of ??and Quantum Electrodynamics for Nonrelativistic Systems (T Kinoshita)Observations on Conductance Quantization and Dephasing in Mesoscale Systems (A Stern et al.)Quantum Ballistic Electron Transport and Conductance Quantization in a Constricted Two-Dimensional Electron Gas (B J van Wees)and other papersProceedings of the Fourth International Symposium (M Tsukada et al.):Reflections on the Development of Theoretical Physics (C N Yang)The Effect of Dissipation on Tunneling (A J Leggett)Quantum Diffusion in Metals (J Kondo)Tunneling Phenomena in Nuclear Physics (R A Broglia et al.)and other papersReadership: Scientists and engineers in optics, electronics, magnetics, device physics, condensed matter physics and applied physics in general.Key Features:It brings new perspectives on the intersection of theoretical physics, ideology, philosophy and politics in the 20th centuryIt fills the historiographical lacuna on RosenfeldIt brings a more balanced view on the controversy over the foundations of quantum mechanics