Quantum correlations, foundations & formalism is a research area in quantum information theory and quantum foundations that studies nonclassical statistical correlations between quantum systems and the mathematical structures underpinning them. It encompasses entanglement, Bell nonlocality, steering, and contextuality, and analyzes their characterization via correlation sets, operator algebras, tensor product structures, resource theories, and generalized probabilistic frameworks. The field investigates axiomatic reconstructions of quantum theory, relationships between different nonclassical correlations, and constraints imposed by causality, information principles, and symmetry. It also explores operational and device-independent formulations, linking foundational questions to cryptography, communication complexity, and many-body physics.
Pairs of correlated or entangled photons are a foundational resource in quantum optics. They are most commonly produced through spontaneous parametric down-conversion (SPDC), a nonlinear optical process that typically relies ...
Optics & Photonics
May 15, 2026
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Two RIKEN physicists have established new theoretical limits for experimentally measurable quantities by viewing solids through a lens of quantum geometry. Their results shed light both on the physics of solids and on quantum ...
Condensed Matter
May 13, 2026
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For more than 60 years, Bell's theorem has been the gold standard for demonstrating that quantum mechanics defies the rules of classical physics. Now, an international team of researchers, including Constructor University ...
Quantum Physics
May 11, 2026
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Theories of quantum mechanics predict that some particles can exist in superpositions, which essentially means that they can be in more than one state at once. When a particle's state is measured, however, this superposition ...
Researchers from the National University of Singapore (NUS) and collaborators have developed a predictive design strategy for creating graphene-like molecules with multiple interacting spins and enhanced resilience to magnetic ...
Nanophysics
May 6, 2026
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Quantum geometry describes quantum states in systems with changing system parameters, such as an electron spinning in a magnetic field whose direction is slowly changing. The state of the electron evolves, and this change ...
Optics & Photonics
May 6, 2026
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As Homer tells us, Odysseus made an epic journey, against the odds, from Troy to his home in Ithaca. He visited many lands, but mostly dwelt with the nymph Calypso on her island. We can imagine that his wife, Penelope, would ...
Optics & Photonics
May 1, 2026
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689
In thermodynamics, an "adiabatic process" is a system change that transfers no heat in or out of the system. Any and all energy change in that system are therefore accomplished by doing work on the system, work being action ...
It was 1972 and Apollo astronauts Harrison "Jack" Schmitt and Eugene Cernan had just stepped onto the moon's surface to begin collecting rock and soil samples.
Space Exploration
Apr 24, 2026
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22
When you throw a ball in the air, the equations of classical physics will tell you exactly what path the ball will take as it falls, and when and where it will land. But if you were to squeeze that same ball down to the size ...
General Physics
Apr 22, 2026
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