Science – Page 20

Tuning Quantum Links: How Temperature Impacts Entanglement

03.12.2025 by pricpr

New research demonstrates a clear relationship between temperature, magnetic fields, and the fragile quantum entanglement observed in simple two-spin systems.

Decoding Atomic Bonds with Machine Learning

03.12.2025 by pricpr

A new benchmark dataset and framework, QuantumCanvas, is accelerating the development of machine learning models that can accurately predict interactions between atoms.

Harnessing Quantum Clusters for Enhanced Sensing

03.12.2025 by pricpr

$Within an adamantane plastic crystal, correlated spin clusters grow and evolve under an effective Hamiltonian ${\cal H}_{\mathrm{eff}}$, their coherence order distributions-sensitive to radio-frequency pulse-width jitters introduced during manipulation-allowing for quantification of distortion via a variance metric defined in Eq. 11, with cluster size determined through Gaussian fitting of distributions obtained while varying phase $\phi$ and loop number $L_1$ at a fixed $L_2$ and parameters $\Delta=1.5\penalty 10000\ \mu s$ and $\Delta^{\prime}=2\Delta+\tau_{\pi/2}$ with $\tau_{\pi/2}=2.9\penalty 10000\ \mu s$.$

New research reveals how to optimize sensitivity in solid-state NMR by carefully balancing quantum coherence and decoherence within large spin clusters.

Seven Paths to Quantum Paradox

03.12.2025 by pricpr

The illustration demonstrates Bell’s core assumptions, framing information transmission not as a perfect replication of signal, but as a probabilistic process governed by $P(x|y)$, where the receiver decodes a signal $x$ given a transmitted signal $y$, inherently introducing uncertainty and the potential for misinterpretation.

A new framework identifies seven seemingly reasonable assumptions that clash with quantum mechanics, forcing a reassessment of its interpretations.

Resonant Spheres: Harnessing Disentanglement for Dynamic Control

02.12.2025 by pricpr

New research reveals how a ferrimagnetic sphere resonator can exhibit complex nonlinear behavior and bistability through a unique mechanism of parametric excitation.

Beyond Bits: Self-Testing Quantum Order with Qudits

02.12.2025 by pricpr

$The study constructs a $ \mathbb{Z}_{d} $ toric code on a directed toroidal lattice, utilizing directional links and two primary stabilizer operators-$VV$ and $PP$-supplemented by an additional operator, $E(x)E(x)$, indexed by a designated “special site”, to facilitate the construction and examination of Bell inequalities.$

Researchers have developed a novel method for verifying the preparation of a topologically protected quantum state using multi-dimensional quantum systems, paving the way for more robust quantum technologies.

Beyond Equilibrium: Charting Energy Flow in Quantum Systems

02.12.2025 by pricpr

$For a qubit experiencing a Markovian process with initial vector $\vec{r}(0)=(0.5, 0.7, 0.0)$ and decay rate $\gamma=\omega$, the dimensionless quantities representing heat flow, operational heat, entropic heat, standard heat, and entropy variation all exhibit complex temporal dependencies as functions of dimensionless time $\omega t$.$

A new theoretical framework clarifies how energy is transferred and managed in open quantum systems, offering insights into their interactions with the surrounding environment.

Witnessing the Unstable Heart of Quantum Systems

02.12.2025 by pricpr

Researchers have experimentally observed a critical instability point in a quantum system, revealing a new pathway for manipulating quantum states with unprecedented control.

Quantum Limits to Property Testing

02.12.2025 by pricpr

New research establishes fundamental quantum lower bounds for determining properties of data, revealing the inherent computational cost of certain tasks.

Spinning Insights: Quantifying Quantum Entanglement with NMR

02.12.2025 by pricpr

$The study demonstrates how entanglement phase diagrams, delineated by magnetic field ratios $r=B\_{1}/B\_{2}$, reveal a boundary-marked where the singlet witness equals zero-between separable states and entangled thermal states, suggesting that even the most carefully constructed theoretical frameworks have inherent limits to their descriptive power.$

Researchers have developed a practical method to measure quantum entanglement, coherence, and mixedness in two-spin-1/2 systems using readily available NMR spectroscopy techniques.