Science – Page 39

Chaos Unveiled: From Quantum Uncertainty to Classical Sensitivity

09.12.2025 by pricpr

$Within a gravitational wedge at $35^{\circ}$, a stability map-derived from particle density-reveals the delicate boundary between order and chaos, where high entropy signals eigenstates spiraling into unpredictable motion and low entropy indicates regular, predictable behavior, a distinction further illuminated by corresponding density distributions and camera images that confirm the Porter-Thomas distribution for chaotic systems.$

New research reveals how the transition from quantum to classical chaos emerges in a photon gas, driven by the act of measurement itself.

Untangling Quantum Connections: A New Way to Detect Spin-Orbital Entanglement

09.12.2025 by pricpr

$Resonant inelastic X-ray scattering (RIXS) geometry was leveraged to investigate core-to-valence transitions-specifically, dipole-allowed pathways and those enhanced by crystal-field anisotropy-and subsequent quantum Fisher information (QFI) bounds, calculated both with spherically symmetric atomic orbitals and molecular orbitals from X2C-CASSCF calculations, demonstrated a polarization-dependent angular sensitivity-revealing that $π$-to-$π$ and $π$-to-$σ$ transitions exhibit distinct responses to changes in the azimuthal angle $\phi$.$

Researchers have developed a novel method using resonant inelastic X-ray scattering to identify and quantify entanglement between spin and orbital degrees of freedom in quantum materials.

Time’s Quantum Split: Re-examining the Twin Paradox

09.12.2025 by pricpr

$The study demonstrates that relative deviation $ \alpha(T,\Omega,\sigma) $ between a modeled clock and an ideal clock within an inertial frame is demonstrably influenced by clock size-parameterized by $ \sigma $ -and the energy gap $ \Omega=2T\_0 $, suggesting a nuanced relationship between these factors and temporal accuracy.$

A new analysis using quantum field theory challenges conventional understandings of time dilation and the famous twin paradox.

Quantum Structure: How States and Hamiltonians Define Reality

09.12.2025 by pricpr

New research reveals a fundamental link between the mathematical structure of quantum systems and the emergence of the very fabric of spacetime.

Beyond Reality: Unlocking Quantum Secrets with Complex Numbers

09.12.2025 by pricpr

A new analysis reveals how extending quantum self-testing to the realm of complex numbers provides a powerful tool for characterizing and understanding the fundamental limits of quantum correlations.

Gravity’s Quantum Checkup: Testing the Limits of Equivalence

09.12.2025 by pricpr

The device leverages the delicate balance of quantum systems-specifically, two-level systems subject to coherent control-to detect minute forces, accounting for inertial and gravitational effects-including those from the Sun and Earth-while intentionally omitting more distant celestial influences to isolate the core measurement within a non-inertial frame.

A new review explores how sensitive measurements with torsion balances and quantum states could reveal subtle violations of the Weak Equivalence Principle, bridging the gap between general relativity and quantum mechanics.

Spin’s Memory: Beyond Simple Damping in Ferromagnets

09.12.2025 by pricpr

New research reveals that ferromagnetic materials exhibit a surprising ‘memory effect’ at terahertz frequencies, challenging the conventional understanding of how spins relax.

Beyond Hermiticity: Geometry’s Role in Quantum Control

09.12.2025 by pricpr

A new perspective on non-Hermitian quantum systems reveals how geometric properties dictate the behavior of wavepackets and open doors to novel control mechanisms.

Beyond Quantum: Defining the Limits of Reality

09.12.2025 by pricpr

A new analysis clarifies the conditions under which quantum mechanics provides the most accurate predictions, revealing a precise boundary for potential improvements from alternative theories.

Quantum Batteries Get a Boost from ‘Looking Around’

09.12.2025 by pricpr

$This study demonstrates that a cavity-mediated spin-spin qubit battery, operating under both weak ($g\_{B}=\omega/10$, $g\_{C}=\omega/5$) and strong ($g\_{B}=\omega$, $g\_{C}=2\omega$) coupling regimes, exhibits quantifiable ergotropy - the maximum useful work extractable from a quantum system - bounded by corresponding energy limits, with purity of the battery qubit maintained as a function of charging time across 1000 trajectories.$

New research reveals that actively monitoring a quantum battery’s environment can unlock greater energy extraction efficiency.