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.
Researchers Kazuaki Takasan and Kyogo Kawaguchi of the University of Tokyo with Kyosuke Adachi of RIKEN, Japan, have demonstrated that ferromagnetism, an ordered state of atoms, can be induced by increasing particle motility ...
Condensed Matter
Apr 26, 2024
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Researchers simulated a key quantum state at one of the largest scales reported, with support from the Quantum Computing User Program, or QCUP, at the Department of Energy's Oak Ridge National Laboratory.
Quantum Physics
Apr 22, 2024
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Researchers from Germany and Singapore have studied a non-equilibrium state of Fermi liquids called the Floquet Fermi liquid (FFL), which is formed when Fermi liquids are subjected to a periodic driving force and kept in ...
An international research team from Innsbruck and Geneva has, for the first time, probed the dimensional crossover for ultracold quantum matter. In the regime between one and two dimensions, the quantum particles perceive ...
Soft Matter
Apr 10, 2024
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Quantum many-body systems are things such as atomic nuclei that consist of many tiny particles moving in complex ways. This makes it extremely difficult to predict how the systems behave as the particles interact. To study ...
Quantum Physics
Apr 9, 2024
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Physicists at Julius-Maximilians-Universität Würzburg (JMU) have made a discovery that could boost the understanding of the role of entanglement in high-temperature copper oxide superconductors. The low-energy quasiparticles ...
Condensed Matter
Apr 9, 2024
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71
A new study by scientists from Japan explores the propagation of quantum information within interacting boson systems like Bose-Einstein condensates (BECs), revealing the potential for accelerated transmission unlike previously ...
The rapid progress of quantum simulators is now enabling them to study problems that before have been limited to the domain of theoretical physics and numerical simulation. A team of researchers at Google Quantum AI and their ...
Condensed Matter
Apr 5, 2024
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213
A breakthrough in theoretical physics is an important step toward predicting the behavior of the fundamental matter of which our world is built. It can be used to calculate systems of enormous quantities of quantum particles, ...
Condensed Matter
Apr 4, 2024
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Superfluorescence (SF), as a cooperative radiation effect originating from vacuum quantum fluctuations, is an ideal platform for studying many-body correlation mechanisms in an exciton ensemble, and for developing optically ...
Condensed Matter
Apr 1, 2024
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