Science – Page 37

Entanglement’s Hidden Geometry

11.12.2025 by pricpr

New research reveals a fundamental link between quantum entanglement and the underlying geometry of spacetime, suggesting entanglement isn’t just a quantum phenomenon, but a geometric property.

Beyond the Limit: How Many Photons Can Defy Uncertainty?

11.12.2025 by pricpr

$Even in maximally entangled states, the preponderance of photon pairs remain uncorrelated, a phenomenon quantified by a nonclassical correction to the time-frequency uncertainty product-which scales logarithmically with the average photon number, as demonstrated by a linear asymptotic fit with $k \approx 1$ and $c \approx 0.18$.$

New research explores the fundamental limits of using intense quantum light to achieve resolution beyond what’s possible with classical fields.

Beyond Hermiticity: Mapping the Topology of Quantum Walks

11.12.2025 by pricpr

$The study reconstructs energy bands and vector components within a weakly non-Hermitian regime-specifically at $(\delta,\eta)=(\pi,0.25)$ across one spatial period-to demonstrate how deviations from conventional Hermitian physics manifest as infidelity in right eigenstate overlap and traceable trajectories on the Bloch sphere, thereby exposing the underlying sensitivity of these systems to non-reciprocal interactions.$

Researchers have experimentally characterized a non-Hermitian topological quantum walk in reciprocal space, opening new avenues for exploring exotic quantum phenomena.

Entangled Time: Quantum Clocks Beat the Classical Limit

11.12.2025 by pricpr

A new theoretical protocol demonstrates that synchronizing clocks with quantum entanglement can accelerate time measurement beyond what’s possible with conventional methods.

Untangling the Quantum Link: Observing Entanglement with Controlled Interactions

11.12.2025 by pricpr

The quantum error estimation employs a circuit designed to initially align the qubit and environment, then leverages a time-dependent interaction to prepare a specific environmental state while preserving qubit integrity, followed by Hadamard gate application and subsequent qubit coherence measurements-using observables defined by Pauli operators-to assess error characteristics.

Researchers have developed a new technique to detect and characterize entanglement between a qubit and its surrounding environment by finely tuning their interaction.

Beyond Bell: Certifying Quantum Behavior with Gentle Measurements

11.12.2025 by pricpr

$The quasi-probability density function of internal energy variation for a qubit-determined from experimental data obtained via the IBMQ-VIGO processor-demonstrates how relaxation strength, parameterized from $p=0$ (no dissipation) to $p=1$ (full relaxation), influences the system’s dynamics-specifically with initial conditions set at $\theta=0.7$, $\phi=1.2$, and parameters $\alpha=1$, $\beta=0.5$-as predicted by the QNDM and TPM schemes.$

A new review demonstrates how non-demolition measurements offer a powerful approach to pinpointing the boundary between quantum and classical worlds.

Rewriting Causality: A New Foundation for Indefinite Orders

11.12.2025 by pricpr

One-way signaling allows any transformation respecting the no-influence condition to be implemented via a circuit connecting a slot from A1 to X1.

Researchers have uncovered a fundamental principle, parity erasure, that underlies the emerging field of indefinite causal order, offering a pathway to understand processes where cause and effect aren’t strictly defined.

Beyond Equilibrium: Mapping Quantum Transitions with Fidelity

11.12.2025 by pricpr

$The clock model, examined at $L=8$ with a transverse field $h=ge^{i\theta}$ where $\theta$ ranges from 0 to $\pi$, demonstrates that ground-state energy differences between symmetry sectors-specifically, the real and imaginary components of the difference between $q=0$ and $q=1,2$ states-fluctuate predictably with changes in $\theta$, revealing the system's sensitivity to the phase of the applied field and hinting at underlying instabilities within its quantum structure.$

A new theoretical approach leverages fidelity zeros to pinpoint phase transitions in complex quantum systems, extending the reach of Lee-Yang theory.

Squeezed Light Powers Real-Time Quantum Teleportation

10.12.2025 by pricpr

Researchers have built a system that generates the essential quantum resources for teleportation using squeezed light and photon subtraction, bringing practical quantum networks closer to reality.

Beyond Gaussian Beams: A New Testbed for Quantum Advantage

10.12.2025 by pricpr

$The study demonstrates a versatile interferometer capable of implementing Gaussian boson sampling (GBS), heralded single-photon sampling (SBS), and thermal boson sampling (TBS) through manipulation of input states-specifically, eight squeezed vacuum states ($|SMSV\rangle$), heralded Fock states, or thermal states-with subsequent photon number resolution (PNR) detection at the output, or, in the case of TBS, by tracing out a secondary mode of the squeezed vacuum input.$

Researchers have unveiled a novel platform for comparing the performance of different quantum states in boson sampling, revealing critical limitations in scaling for Gaussian approaches.