Entanglement’s Speed Limit: How Interactions Shape Quantum Information
![Following a quench from a weakly-entangled state, the rate of growth of state entanglement is determined by a static solution to the equations of motion-specifically, [latex]\theta(x) = \arctan\exp\left(2x/l\right)[/latex]-which defines an entanglement membrane tension [latex]\mathcal{E}(v)[/latex] at [latex]v=0[/latex], and is degenerate under spatial translations where [latex]l \equiv \Delta\_0/\Delta\_I[/latex].](https://arxiv.org/html/2601.21134v1/staticwall.png)
New research reveals the mechanics of entanglement in noisy quantum systems, identifying a characteristic velocity that governs how quickly information spreads.
Science
Catching Polarons in the Act
![The dynamics of hole polaron formation in MgO reveal a time-dependent energy landscape, transitioning from an initial state-indicated by calculations yielding [latex]E_{static}[/latex]-to a stabilized configuration, as evidenced by the evolution of the hole envelope function [latex]A_{n{\bf k}}(t)[/latex] over timescales of 10 to 500 femtoseconds and corresponding shifts in the density of injected holes within the conduction band.](https://arxiv.org/html/2601.21810v1/Fig2.png)
New research uses advanced theoretical modeling to observe the fleeting formation of polarons – quasiparticles crucial to understanding material conductivity – in real time.
AI Unlocks a New Generation of Electronic Materials
![An accelerated discovery workflow integrates physical principles, generative modeling ([latex]MatterGen[/latex]), machine learning potential prescreening ([latex]MatterSim[/latex]), and high-throughput density functional theory validation to efficiently identify and analyze candidate electride materials, systematically filtering compositions based on defined metrics and retaining only those meeting stringent stability criteria.](https://arxiv.org/html/2601.21077v1/Fig1.png)
A novel computational framework combining artificial intelligence and materials science dramatically accelerates the discovery of inorganic electrides with unique electronic properties.
Uncovering Hidden Patterns in Quantum Quenches
![Following a sudden shift in interaction strength, the system’s double occupancy - a measure of paired particles - exhibits time-dependent fluctuations whose period and long-term average are demonstrably modulated by the magnitude of that shift, revealing a nuanced relationship between quench strength [latex]U_f/W[/latex] and the resulting dynamic behavior.](https://arxiv.org/html/2601.22053v1/1B.png)
New research reveals how spatial variations dramatically influence the behavior of interacting electrons after a sudden change in their environment.
Black Hole Light Could Reveal a Hidden Side of Reality
A new proposal suggests the Event Horizon Telescope could detect subtle polarization patterns in light around black holes, potentially unveiling evidence of CP violation in the vacuum itself.
Inside Baryons: Mapping Their Gravitational Shape
![The study details a comparison of gravitational form factors - specifically [latex]A_{T20}(t)[/latex] and [latex]\bar{B}_{T20}(t)[/latex] - as they vary with transverse momentum transfer for up quarks within both a proton and a [latex]\Xi^{0}[/latex] baryon, illuminating fundamental aspects of their internal structure.](https://arxiv.org/html/2601.21430v1/x2.png)
New research explores how the internal structure of protons and hyperons influences their response to gravitational forces.
Entanglement in Curved Spacetime: A Numerical Approach
![The study demonstrates that entanglement entropy scales with the square of the AdS radius [latex]R^{2}[/latex], consistent with an area law, and further reveals that the proportionality constant-indicated by the slope-is itself a function of the AdS radius [latex]L[/latex].](https://arxiv.org/html/2601.21566v1/figures/AdS_Fn_of_s.png)
New calculations reveal how quantum entanglement behaves in warped spacetime geometries, bridging the gap between gravity and quantum field theory.
Wave-Like Order in Turbulent Chaos
Researchers have experimentally observed long-range correlations in a turbulent system, revealing an underlying order previously predicted by theoretical models.
Waking the Wave: Observing Collective Excitations in a Critical One-Dimensional System
![The study demonstrates that a system initialized within the ground state of the [latex]XXZ[/latex] Hamiltonian and subsequently evolved under a different Hamiltonian exhibits underdamped oscillations in the [latex]U(1)[/latex]-symmetric probe, with the oscillation frequency dictated by the final Hamiltonian’s parameter and the amplitude scaled by the magnitude of the difference between initial and final Hamiltonian parameters-a behavior consistently observed across a range of parameter values.](https://arxiv.org/html/2601.20926v1/x1.png)
New research details the observation and characterization of an underdamped amplitude mode arising from quantum quenches in a one-dimensional spin system.
Hunting for Hidden Hadrons: A Search for Exotic Decay Paths
![The distributions of [latex]M(\pi^{+}\pi^{-}J/\psi)[/latex] and [latex]M(\eta_{h}\psi(2S))[/latex] at center-of-mass energies of 4.92 and 4.95 GeV reveal distinct signal regions for [latex]\psi(2S)[/latex] and [latex]\psi_{0}(4360)[/latex], as demonstrated through a comparison of data-represented by black dots with error bars-with inclusive and signal Monte Carlo simulations of [latex]e^{+}e^{-}\rightarrow\eta\psi_{0}(4360)[/latex].](https://arxiv.org/html/2601.21190v1/x755.png)
New data from the BESIII experiment probes the decay of a mysterious particle, seeking evidence for its composition and furthering our understanding of exotic hadronic states.