Quantum many-body systems are physical systems composed of a large number of interacting quantum particles (such as electrons, atoms, or spins) whose collective behavior cannot be reduced to a simple sum of single-particle properties. They are described by many-body Hamiltonians on high-dimensional Hilbert spaces, where quantum statistics, entanglement, and correlations play central roles. Such systems exhibit emergent phenomena including quantum phase transitions, superconductivity, magnetism, and topological order, and are studied using methods like second quantization, Green’s functions, tensor networks, and quantum Monte Carlo to understand their equilibrium and nonequilibrium properties across different interaction and dimensionality regimes.
The interactions between quantum spins underlie some of the universe's most interesting phenomena, such as superconductors and magnets. However, physicists have difficulty engineering controllable systems in the lab that ...
Quantum Physics
Sep 12, 2024
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Although systems consisting of many interacting small particles can be highly complex and chaotic, some can nonetheless be described using simple theories. Does this also pertain to the world of quantum physics?
Quantum Physics
Sep 9, 2024
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Physicists at the University of Bonn and the University of Kaiserslautern-Landau (RPTU) have created a one-dimensional gas out of light. This has enabled them to test theoretical predictions about the transition into this ...
Quantum Physics
Sep 6, 2024
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Researchers from the Institute for Molecular Science have revealed quantum entanglement between electronic and motional states in their ultrafast quantum simulator, generated by the repulsive force due to the strong interaction ...
Quantum Physics
Sep 3, 2024
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Researchers from Skoltech, Universitat Politècnica de València, Institute of Spectroscopy of RAS, University of Warsaw, and University of Iceland have demonstrated the spontaneous formation and synchronization of multiple ...
Condensed Matter
Sep 3, 2024
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When different quantum states combine, new collective states of matter can emerge. In the quantum realm, combining components such as atoms that possess quantum effects can give rise to macroscopic quantum states of matter, ...
Condensed Matter
Aug 29, 2024
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A 3D quantum spin liquid has been discovered in the vicinity of a member of the langbeinite family. The material's specific crystalline structure and the resulting magnetic interactions induce an unusual behavior that can ...
Soft Matter
Aug 23, 2024
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Atoms are complex quantum systems consisting of a positively charged nucleus surrounded by negatively charged electrons. When multiple atoms come together to form a molecule, the electrons of the constituent atoms interact ...
General Physics
Aug 6, 2024
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Over the past decades, computer scientists have developed various computing tools that could help to solve challenges in quantum physics. These include large-scale deep neural networks that can be trained to predict the ground ...
An international team of physicists, centered at Trinity, has proven new theorems in quantum mechanics that describe the "energy landscapes" of collections of quantum particles.
Condensed Matter
Jul 17, 2024
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