Science – Page 59

Beyond Unitary Evolution: A New Path for Quantum Simulation

16.11.2025 by pricpr

Researchers have developed a novel framework for simulating quantum systems that evolve beyond the standard rules of unitary dynamics, opening doors to more realistic and powerful quantum computations.

Hidden Correlations: A New Phase of Quantum Information

16.11.2025 by pricpr

$The study delineates a phase diagram for Holevo information, $χ({\cal E}_{{\rm PPE}_{R}})$, revealing its relationship to entanglement phases between subsystems, and establishes a boundary—differentiated through analytical calculations and numerical extrapolation—between measurement-visible and measurement-invisible regimes for tripartite Haar-random states across varying qubit partitions, as demonstrated by heatmap analysis and finite-size scaling data presented elsewhere.$

Researchers have discovered a distinct phase transition in the information content of quantum ensembles, revealing states where correlations exist despite being undetectable by standard measurements.

Harnessing Geometric Forces for Quantum Energy Transfer

15.11.2025 by pricpr

$Energy pumping into a driven system exhibits sensitivity to initial conditions and parameter ratios, as demonstrated by trajectories revealing variance influenced by the ratio $p/q=3/2$, standard deviation plots across different $p/q$ values, and comparisons between phase-averaged results and analytical calculations—all while maintaining consistent parameters of $\omega=0.4$, $\Delta=1$, $m=0.5$, $c=1/\sqrt{2}$, and $\delta\phi=\pi/2$.$

A new theoretical framework details a method for sustainably pumping energy in quantum systems by exploiting non-abelian Berry curvature and transitionless control techniques.

Decoding Quantum States for Molecular Modeling

15.11.2025 by pricpr

The shadow variational 2-RDM method, incorporating full 2-positivity constraints, demonstrates a relationship between computational budget—specifically, the total number of shots—and the achievable precision, as evidenced by the lowest 2-RDM eigenvalue, when contrasted with the Fermionic Classical Shadows approach applied to the H4 molecule in a minimal basis set.

A new approach to quantum state reconstruction promises more accurate and robust simulations of complex molecular systems on today’s noisy quantum hardware.

When Connections Interfere: A New Angle on Causal Interaction

15.11.2025 by pricpr

Across a paired test set, the policy consistently achieved lower negative log-likelihood, Brier score, and expected calibration error compared to the best baseline model, as indicated by budget-matched differences with 95% confidence intervals across 20 seeds.

A new theoretical framework reframes causal interaction not as direct influence, but as an emergent property of coherent aggregation, drawing inspiration from the principles of quantum mechanics.

Beyond Boolean: A Logic for Quantum States and Possibilities

15.11.2025 by pricpr

A new formal system unifies the principles of quantum mechanics and modal logic to reason about the states and potential evolutions of quantum systems.

Beyond Hermiticity: Entanglement’s Strange New Phase Transitions

15.11.2025 by pricpr

$The Non-Hermitian Tight-Binding Floquet-Impurity (NHTFI) model demonstrates entanglement dynamics, with steady-state entanglement entropy exhibiting sensitivity to driving frequency—specifically, differing behaviors are observed at $\Omega = 0.9$ and $\Omega = 2$, suggesting a nuanced relationship between driving parameters and system entanglement.$

New research reveals unexpected entanglement behavior in non-Hermitian quantum systems, challenging conventional understandings of phase transitions.

Sensing Chirality with Light

15.11.2025 by pricpr

$A Fabry-Pérot cavity hosts chiral molecules – right-handed NRN\_{R} and left-handed NLN\_{L} – each driven by classical control fields with amplitudes $ \Omega_{31} $ and $ \Omega_{32} $ and coupled to the cavity mode with strength $ g $, enabling enantiodetection through a $ \pi $ phase difference in dipole coupling products, achieved by coherent driving at frequency $ \nu_p $ with amplitude $ \eta $ and balanced by photon loss at rate $ \kappa $.$

Researchers have demonstrated a novel quantum optical technique for distinguishing between mirror-image molecules, paving the way for more sensitive chemical analysis.

Defying Decoherence: How Symmetry Can Extend Qubit Lifetimes

15.11.2025 by pricpr

$The study demonstrates how decoherence evolves differently depending on the non-Hermitian character of both the system and its environment, specifically revealing that systems and environments exhibiting non-Hermiticity—with parameters $E_1$ and $\tau$ influencing the degree of non-Hermiticity—experience distinct decoherence patterns compared to purely Hermitian setups, as observed at fixed angles of $\theta = \pi/2$, $\theta = \pi/3$, and $\theta = \pi$.$

A new study challenges conventional wisdom by demonstrating that carefully engineered, non-Hermitian environments can actually increase the coherence of quantum bits.

Against the Flow: Quantum Particles Defy Expectations

15.11.2025 by pricpr

The study demonstrates a rescaled state capable of maximizing general backflow and reentry—a departure from standard positive-momentum maximizing states—suggesting the potential for theories to be fundamentally altered or lost beyond a critical threshold, much like information falling into a black hole.

New research reveals that quantum backflow – the counterintuitive movement of particles against the direction of travel – is more pronounced than previously thought, challenging established limits on nonclassical transport.