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Collective quantum phenomena and their applications

John H. Miller

Published Jul 8, 2024• 0 citations
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Abstract

Collective quantum phenomena and their applications John H. Miller, Jr., University of Houston (UH), from the Dept. of Physics and Texas Center for Superconductivity, explains collective quantum phenomena and their applications. The evidence supporting the quantum behavior of electrons, as well as every other known particle in the universe, is overwhelming. On the centennial anniversary of Max Planck’s seminal paper on energy quantization (1), Kleppner and Jackiw pointed out, “Quantum theory is the most precisely tested and most successful theory in the history of science”. (2)

DOI
10.56367/oag-043-11330

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Collective quantum phenomena and their applications John H. Miller, Jr., University of Houston (UH), from the Dept. of Physics and Texas Center for Superconductivity, explains collective quantum phenomena and their applications. The evidence supporting the quantum behavior of electrons, as well as every other known particle in the universe, is overwhelming. On the centennial anniversary of Max Planck’s seminal paper on energy quantization (1), Kleppner and Jackiw pointed out, “Quantum theory is the most precisely tested and most successful theory in the history of science”. (2)
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Quantum theory is perhaps the theory with the greatest predictive and explanatory success in all the history of physics. To name just a few of its countless achievements: it explains the stability of the stable atoms and nuclei and predicts the decay rates of the unstable ones; it accounts for the different manifestations of matter such as gaseous, liquid and solid, metallic and insulating, magnetic, superfluid and superconducting; it forms the basis of our chemical knowledge; and it provides the conceptual framework of all contemporary models for the fundamental constituents of matter. In addition, some of its predictions, for example that of the ‘electron spin g -factor’ in quantum electrodynamics, are perhaps the most accurate ones ever made in the history of science. Some of its predictions concern matter at extremely high energy and interactions between bits of matter at extremely short distances; others are about matter at extremely low energy and close to the zero of absolute temperature. As far as its technological applications are concerned, its insights are at the heart of the overwhelming technological progress in information technology in the past few decades, it explains why nuclear fission and fusion work as they do, and it forms the basis of the rapidly growing field of nanotechnology. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Quantum theory is incredibly successful, explaining the microscopic world with great accuracy, from the behaviour of subatomic particles to chemical reactions to solid-state electronics. There is not a single experimental finding challenging its predictions, and ever more quantum phenomena are exploited in technology, including interferometric sensing and quantum cryptography. In order to explore novel applications and test the validity of quantum physics at the macroscale, researchers strive to prepare ever heavier and bigger objects in quantum superpositions. Experiments with levitated microscale particles are about to push this quest into uncharted waters.
Abstract In the 1930s and 1940s, the quantum theory of solids dealt primarily with singleelectron phenomena. Although surprisingly many problems were solvable within this framework, some were not-for example, the explanation from first principles of superconductivity and the calculation of the cohesive energy of metals. A related problem, whose connection to superconductivity was recognized almost immediately, was the superfluidity of4He, discovered experimentally in 1937. More generally, phase transitions-ordinary liquid-gas and melting, as well as those to the superconducting, superfluid, and ferromagnetic states-lacked adequate theory. These various phenomena, unexplainable within a single-particle framework, depend strongly on the interactions between particles in the systems; today they are recognized as “collective” or “cooperative” phenomena.
Abstract The behavior of electrons provides several concrete examples of quantum phenomena. We consider electron spin properties, how electrons move, quantum randomness and the relationships between observables, quantum limits on empirical prediction, superpositions, interference effects, nonlocality, and the role of observation in generating quantum phenomena. Each illustrates the counterintuitive nature of quantum phenomena and provides a sense of the sort of phenomena that any satisfactory formulation of quantum mechanics must predict and explain.