Science – Page 48

Cycles, Entanglement, and Quantum Advantage

01.12.2025 by pricpr

New research reveals how topological properties of game cycles connect to the power of quantum strategies, offering insights into the fundamental limits of computation.

Squeezing Information from the Edge of Chaos

01.12.2025 by pricpr

$The study demonstrates that the long-time growth rate $k_F$ of the Fisher information $F(\varphi, s)$ under homodyne detection is optimized not at backaction-evading conditions ($\varphi = 0.6$), but rather at general-dyne measurements identified by parameters $(s_{opt}, \varphi_{opt}) = (0, 0.583)$, achieving a maximized Fisher information that surpasses the global quantum Fisher information $I_{G}$.$

New research reveals how harnessing quantum measurement backaction at critical points can dramatically improve the precision of continuous sensing protocols.

Beyond the Limit: Quantum Sensing with Geometric Phase

01.12.2025 by pricpr

Longitudinally-coupled qubit-oscillator systems undergo free evolution within oscillator phase space, and a geometric protocol-involving a specific sequence of operations-manipulates this motion, demonstrating how control sequences dictate the system’s trajectory and revealing the fundamental interplay between quantum states and classical dynamics.

A new approach leverages the geometric phase in qubit-oscillator systems to achieve enhanced sensitivity in quantum sensing applications.

Beyond the Quantum Limit: Harnessing Non-Commutation for Precision Measurement

01.12.2025 by pricpr

$Quantum estimation schemes explore varied approaches to parameter inference, ranging from sequential applications of a parameter-encoding operator $H^\lambda$ to more complex, coherently controlled, non-commutative sequences involving both $H^g$ and $H^\lambda$ repeated $N$ times, ultimately demonstrating a progression in encoding strategies for enhanced precision.$

A new framework reveals how the fundamental non-commutative nature of quantum mechanics can be exploited to dramatically enhance the precision of measurements, surpassing established limits.

Time Crystals Illuminate the Path to Ultra-Precise Sensing

01.12.2025 by pricpr

$A boundary time crystal functions as a tunable light source and decoder, encoding phase information onto emitted photons via a unitary transformation $e^{-i\hat{\Lambda}\varphi}$ and revealing it through monitoring time-averaged intensity, where a zero phase difference renders the decoder a perfect absorber, and homodyne detection sensitive to the phase difference between the input field and a local oscillator.$

Researchers have harnessed the unique properties of boundary time crystals to create a light source capable of surpassing the standard limits of measurement precision.

Recommender Systems That Adapt to Change

30.11.2025 by pricpr

The system models data generation as a temporal process shaped by both fluctuating factors $𝐯$ and stable characteristics $𝐬$, acknowledging that observed samples $𝐱$ and their labels $𝐲$ are ultimately products of latent representations $𝐳$ and inherent causal dependencies-a framework anticipating inevitable shifts in distribution over time.

New research tackles the challenge of maintaining accuracy as user preferences and data patterns evolve over time.

From Quantum Waves to Irreversible Change

30.11.2025 by pricpr

New research illuminates the quantum roots of the Boltzmann equation, revealing how decoherence drives the emergence of classical irreversibility.

Seeing Through the Fog: Better Belief Tracking for Smarter Simulations

30.11.2025 by pricpr

Accurately estimating hidden states is crucial for training intelligent agents in complex, uncertain environments, and this research offers new strategies for selecting the best approximations.

Graph Structures and Eigenvalue Extremes

30.11.2025 by pricpr

The study details two distinct data structures-lists formatted as $txt$ and graphs represented as $g6g6$-demonstrating how information can be organized and presented through differing, yet complementary, methodologies.

New research explores the interplay between graph architecture and spectral properties, pinpointing graphs that maximize and minimize key connectivity measures.

Watching Neon Grow: Real-Time Control for Better Qubits

30.11.2025 by pricpr

The study demonstrates how varying the initial gas quantity during film deposition-specifically, 0.008 mol versus 0.003 mol-dictates the resulting material’s phase trajectory, transitioning either through a liquid intermediate phase or directly to solid deposition at a cooling rate of 0.07 K/min, as evidenced by shifts in resonator frequency and inferred film thickness measurements.

Researchers have developed a method for monitoring neon film growth in real-time, paving the way for more reliable electron-on-neon qubits.