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.
A joint research team from Japan has observed "heavy fermions," electrons with dramatically enhanced mass, exhibiting quantum entanglement governed by the Planckian time—the fundamental unit of time in quantum mechanics. ...
Condensed Matter
Aug 5, 2025
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Scientists have discovered a new way that matter can exist—one that is different from the usual states of solid, liquid, gas or plasma—at the interface of two exotic materials made into a sandwich.
Condensed Matter
Jul 31, 2025
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Scientists at the Institute for Photonic Quantum Systems (PhoQS) and the Paderborn Center for Parallel Computing (PC2) at Paderborn University have developed a powerful open-source software tool that allows them to simulate ...
Quantum Physics
Jul 30, 2025
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Researchers at the University of California, Irvine have discovered a new state of quantum matter. The state exists within a material that the team reports could lead to a new era of self-charging computers and ones capable ...
General Physics
Jul 25, 2025
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A research team led by TU Darmstadt has transformed a difficult problem in quantum physics into a much simpler version through innovative reformulation—without losing any important information. The scientists have thus ...
Quantum Physics
Jul 24, 2025
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A new theory-guided framework could help scientists probe the properties of new semiconductors for next-generation microelectronic devices, or discover materials that boost the performance of quantum computers.
Quantum Physics
Jul 24, 2025
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At the forefront of discovery, where cutting-edge scientific questions are tackled, we often don't have much data. Conversely, successful machine learning (ML) tends to rely on large, high-quality data sets for training. ...
Quantum Physics
Jul 17, 2025
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Can you prove whether a large quantum system truly behaves according to the weird and wonderful rules of quantum mechanics—or if it just looks like it does? In a new study, physicists from Leiden, Beijing and Hangzhou found ...
Quantum Physics
Jul 14, 2025
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Caltech scientists have found a fast and efficient way to add up large numbers of Feynman diagrams, the simple drawings physicists use to represent particle interactions. The new method has already enabled the researchers ...
General Physics
Jul 10, 2025
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167
Many systems obey simple, linear rules: If you pull twice as hard on a spring, it stretches twice as far. However, when we introduce very large forces or complicated interactions, that linear rule breaks down into a "nonlinear" ...
General Physics
Jul 10, 2025
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