Science – Page 174

Decoding the Quantum Realm: Limits to Channel Identification

18.11.2025 by pricpr

New research establishes fundamental limits on how accurately we can distinguish and estimate quantum channels, crucial for secure communication and quantum technologies.

Cosmic Friction: How Galaxy Surveys Will Probe Dark Matter’s Hidden Properties

17.11.2025 by pricpr

The study demonstrates that viscous dark matter exhibits suppressed growth of density contrast relative to baryons, as numerically solved from Eqs. (106) and (107) at $k=0.05$ and $k=0.12$ hh/Mpc, with analysis focused solely on bulk viscosity under the conditions $Θ=Γ=0, μ_G=η=1$.

New research suggests upcoming astronomical observations can reveal the subtle effects of ‘cosmic friction’ within dark matter and test the fundamental principles of gravity.

Quantum Oscillators Fall into Step: Synchronization Revealed by Measurement

17.11.2025 by pricpr

New research shows that quantum and classical oscillators exhibit strikingly similar synchronization patterns when continuously observed, challenging traditional notions of quantum behavior.

Electrons as Qubits: Towards Ultrafast Quantum Computation

17.11.2025 by pricpr

$Ultrafast quantum gates manipulating electron populations on momentum sidebands are demonstrated via coherent light interaction, achieving a $\pi$-pulse in 43.3 fs with 0.994 fidelity for a 100 eV electron and a dispersive iSWAP gate in 7.81 ps with 0.991 fidelity, both sustained by strong vacuum field amplitudes near $7.5 \times 10^6$ V/m and validating the Jaynes-Cummings and Tavis-Cummings models even with increased field strength.$

A new theoretical framework harnesses the quantum properties of free electrons and their interaction with light to design exceptionally fast and scalable quantum gates.

Entangled Light Bridges the Distance for Next-Gen Telescopes

17.11.2025 by pricpr

Researchers have demonstrated a quantum interferometer leveraging entanglement over a 20km fiber link, paving the way for significantly enhanced astronomical imaging capabilities.

Quantum Echoes of the Riemann Hypothesis

17.11.2025 by pricpr

$A molecular system, utilizing the nuclear spins of 1-bromo-2,4,5-trifluorobenzene and encoded as qubits—with the F1 spin acting as a probe—provides a physical platform for simulating the Riemann zeta function through a quantum circuit implementing thermal state preparation, controlled dynamical evolution, and coherence measurement via shaped control pulses parameterized by $\beta$ and $t$, effectively demonstrating population transfer governed by parameters $\lambda_i$ and $\psi_i$ and described by a traceless deviation density matrix.$

New research reveals a surprising link between the notoriously difficult Riemann Hypothesis and the behavior of engineered quantum systems.

Relativity’s Ripple on Quantum Reality

17.11.2025 by pricpr

The thought experiment, as originally conceived by A. Einstein and detailed in reference [10], serves as a foundational exploration of the relationship between observation and reality.

A new analysis explores how the principles of special relativity impact the act of quantum measurement and the consistency of wave function collapse.

Quantum Supremacy Strengthened: New Experiments Push the Boundaries of Classical Physics

17.11.2025 by pricpr

Researchers have demonstrated a significant and robust violation of classical limits using a novel quantum experiment on trapped-ion hardware.

Twisted Disks, Shifting Signals: A New View of Black Hole Behavior

17.11.2025 by pricpr

$The transition from one quasi-periodic oscillation (QPO) type to another in X-ray binaries appears linked to a warping of the accretion disk, where a radius, $r_{b}$, marks the point beyond which the outer disk remains aligned, while within $r_{b}$ a warp is forced upon the cold accretion disk, altering the alignment angle of the hot flow and signaling a shift from type C to type B configurations.$

Researchers propose a unified model linking the diverse low-frequency oscillations observed in black hole X-ray binaries to the dynamics of warped accretion disks.

Untangling Time: A New Approach to Causal Discovery

17.11.2025 by pricpr

Functional magnetic resonance imaging data from distinct brain regions—specifically, $X_1$ from region 1 and $X_2$ from region 2—are susceptible to spurious correlations when an unobserved external interference, designated as $ZZ$, acts as a latent variable influencing the measurements.

Researchers have developed a novel method for identifying causal relationships in dynamic systems, even when hidden factors are at play.