Science – Page 158

Secure Ballots: Quantum Physics Takes on Electronic Voting

05.12.2025 by pricpr

The scheme generates a quantum state subject to fourfold postselection, manipulated through the use of a quarter waveplate to achieve desired quantum properties.

Researchers have successfully demonstrated a quantum voting protocol using entangled photons, offering a new path toward truly private and verifiable elections.

Persistent Quantum Oscillations in a Flat-Band Chain

04.12.2025 by pricpr

New research reveals that quantum quenches in a specifically tuned XXZ chain don’t lead to thermalization, but instead exhibit sustained oscillations in entanglement and other key observables.

Taming Light and Magnetism: New Crystals Unlock Topological States

04.12.2025 by pricpr

Researchers have demonstrated a novel platform for exploring exotic quantum phenomena using synthetic photo-magnonic crystals, paving the way for robust information carriers.

Beyond Bell: Detecting Quantum Entanglement with Everyday Systems

04.12.2025 by pricpr

$Rotational covariance emerges as a fundamental principle across diverse physical systems-from measurements invariant under $2\pi$ rotations, to the behavior of polarized photons in Compton scattering exhibiting covariance with respect to angle $\varphi$, and even extends to experimental setups like the manipulation of photon polarization via half-wave plates and subsequent detection-demonstrating that rotating the preparation or detection process yields equivalent descriptions.$

A new framework demonstrates that entanglement can be detected using rotationally covariant measurements, even with seemingly mundane systems like a glass of lemonade.

Catching Gravity’s Whisper: A New Lens for Quantum Measurement

04.12.2025 by pricpr

$The study demonstrates a strong correlation between initial velocity dispersion, $σ\_v$, and the accuracy of approximating Fisher information-with the simple prediction, $√{\mathcal{I}\_{S}}$, closely aligning with the exact quantity, $√{\mathcal{I}\_{Z}}$, and exhibiting improved precision as $σ\_v$ increases, notably reaching a value of $79\text{\,}\mathrm{mm}\text{\,}{\mathrm{s}}^{-1}$ that ensures the initial distribution corresponds to a single bounce.$

Researchers develop a refined analytical model to enhance the precision of single-bounce quantum gravimeters, opening doors for sensitive measurements of gravity’s effects on even the rarest materials.

Quantum Annealers Get the Heat Treatment

04.12.2025 by pricpr

$The study demonstrates that effective temperature, $T_{eff}$, collapses across diverse quantum machines at equivalent physical couplings, $J_{phys}$, with a notable exception for Advantage2_system1.1, and exhibits a monotonic decrease with annealing time, $\tau$, converging to asymptotic values-behavior quantified by a dimensionless constant, $\alpha$, derived from the relationship between $T_{eff}$ and $J_{phys}$ as evidenced by the slope of the plotted data.$

New research reveals how accurately these specialized quantum computers mimic thermal sampling, and identifies systematic errors in temperature readings.

Entangled Light on Demand: Tuning Quantum Harmonics

04.12.2025 by pricpr

A new theoretical framework reveals how to engineer entanglement in multi-photon states generated through high-harmonic generation by precisely controlling laser parameters.

Beyond the Limits of Precision: Harnessing Cubic Phase States

04.12.2025 by pricpr

$Cubic phase states demonstrate a superior scaling advantage in metrological sensitivity-achieving a maximum gain of approximately $42.7n$-compared to squeezed vacuum states, which scale at $8n$, and this benefit is realized with a moderate level of squeezing-around $0.88$ dB-and an associated cubicity scaling asymptotically approaching $4\sqrt{n}/9$.$

New research demonstrates that cubic phase states can surpass the sensitivity of conventional Gaussian states in quantum metrology, paving the way for more accurate measurements.

Beyond Gaussian Limits: Sharper Temperature Readings with Quantum Light

04.12.2025 by pricpr

Gaussian and non-Gaussian probes are explored as tools for quantum thermometry, offering a means to estimate the temperature of a bosonic thermal bath through precise quantum measurement techniques.

New research shows that harnessing the unique properties of non-Gaussian quantum states can significantly improve the precision of temperature measurements in noisy quantum systems.

Untangling Quantum Transformations

04.12.2025 by pricpr

$Any deterministic transformation on a quantum channel can be physically realized by sequentially applying two isometries-a pre-processing isometry followed by the channel itself, and a post-processing isometry-with the intermediary step utilizing a quantum memory and subsequent tracing out of the ancillary environment ultimately defining the superchannel dynamics as $ \theta=\Tr_{E_{2}}\circ W\circ V $.$

A new framework clarifies the behavior of quantum superchannels, offering a powerful lens for understanding complex quantum processes.