Science – Page 21

Mapping Quantum Complexity with Information Lattices

25.12.2025 by pricpr

$A higher-dimensional system is reduced to a quasi-one-dimensional information lattice by evaluating local information - determined by both position $n$ and scale $\ell$ - along a chosen direction while effectively merging data from other directions into an enlarged computational space, as demonstrated by constructing chains from subsystems or concentric rings $\mathcal{C}^{l}_{n}$ defined by radius $n$ and thickness $\ell$.$

A novel framework decomposes quantum states by scale and position to reveal hidden structure and redundancies in complex systems.

Chaos Boosts Quantum Sensing Accuracy

25.12.2025 by pricpr

$A superconducting quantum processor, architected with nine transmon qubits, explores the limits of sensitivity through a protocol leveraging information scrambling - specifically, an engineered ‘butterfly state’ entangled from a polarized foundation $|0\rangle^{\otimes 9}$ and a scrambled counterpart $|\psi_{\textrm{sc}}\rangle$ - to approach a sensitivity scaling of half the Heisenberg limit by imprinting a global phase signal $\phi$ analogous to a quantum-enhanced Mach-Zehnder interferometer, and ultimately measured through projective measurement of a central qubit following a localized perturbation and time-dependent unitary evolution.$

Researchers have harnessed the principles of quantum chaos to significantly improve the precision of quantum sensors, bringing them closer to the fundamental limits of measurement.

Beyond Hermitian Physics: Unveiling New Dynamics in Non-Hermitian Spin-Boson Systems

25.12.2025 by pricpr

$The eigenvalue spectrum reveals the $\mathcal{PT}$-symmetric non-Hermitian spin-boson model and its related quantum Rabi model exhibit distinct spectral characteristics when parameterized with $\Delta=0.3$ and $\epsilon=0.1$.$

This review explores how breaking conventional symmetry rules leads to exotic spectral properties and behaviors in a fundamental model of interacting quantum particles.

Beyond Factorization: A New Lens on Entanglement

25.12.2025 by pricpr

Researchers have developed a framework for understanding entanglement in complex systems where traditional mathematical structures break down, opening new avenues for exploring gauge theories and beyond.

Beyond Additivity: Squeezing More Precision from Gaussian Measurements

25.12.2025 by pricpr

A novel Gaussian measurement strategy leverages local operations and nonlinear optics to demonstrate super additivity of the optimal Gaussian Fisher information, simplifying to a balanced beam splitter configuration when considering $m=2$.

New research reveals that combining Gaussian measurements can yield surprisingly enhanced precision in parameter estimation, defying traditional expectations.

Beyond Schrödinger’s Cat: Engineering Superpositions in Infinite Dimensions

24.12.2025 by pricpr

$The observed interference pattern, generated from the probability distribution $P(x)$ based on $\psi$ as defined in equation (22) with $|\alpha|=5$ and $\eta=.99$, demonstrates a consistency between a non-classical system and a locally observed site within an infinite array, where $\alpha=p^{-s}z_{p}$, mirroring results achievable through a globally quadratic Hamiltonian.$

Researchers have demonstrated the creation of macroscopically distinct quantum superpositions using generalized bosonic systems, pushing the boundaries of quantum state engineering.

No Entanglement From a Change of View: Quantum Reference Frames and the Limits of Passive Transformation

24.12.2025 by pricpr

A new theoretical analysis confirms that simply changing your perspective-through passive quantum reference frame transformations-cannot create entanglement between quantum systems.

Disorder’s Ripple: How Scrambled Quantum Information Spreads

24.12.2025 by pricpr

$The study of the Heisenberg XXZ model in strongly disordered conditions-specifically with a disorder parameter of $h=14$ and averaged over 5000 realizations at a system size of $N=13$-reveals that out-of-time-order commutators, $C_x(r,t)$, exhibit light-cone-like behavior with characteristic timescales and spatial decay rates determined by thresholds $\theta \in \{0.25, 0.5, 1\}$, and fitting to functions of the form $t_\theta \propto e^{\beta r}$ and $t_\theta \propto r^\beta$.$

New research reveals how strongly disordered quantum systems spread information differently than their more ordered counterparts, impacting the speed and nature of quantum chaos.

Squeezing the Limits of Force Detection

24.12.2025 by pricpr

A hybrid optomechanical system integrates quantum dots with an optical parametric amplifier to explore and potentially harness the interplay between light and matter at a quantum level.

Researchers have demonstrated a new optomechanical system that dramatically enhances the sensitivity of force measurements, pushing beyond the constraints of classical physics.

Beyond Reality: Quantum Matter with Complex Mass

24.12.2025 by pricpr

$The ground state probability density of the hydrogen molecule ($H_2H_2$) exhibits spatial confinement variations correlated with the parameter $a_{i}$, while peak probability density demonstrates a dependency on both $a_{i}$ and the complex Morse parameter, influenced by real parameters such as $V_{or} = 38266 cm^{-1}$, $a_{r} = 1.868 Å^{-1}$, and $m_{r} = 0.5039 \mu$.$

New research explores the unusual properties of quantum systems governed by complex mass and Morse potentials, revealing unexpected states of matter.