Science – Page 106

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.

Quantum Time’s Arrow: Mapping Information Flow in Complex Systems

15.11.2025 by pricpr

$A repetition code designed to correct single-qubit errors distinguishes between perturbations that propagate through time—logical $Z\overline{Z}$ errors—and those that can be detected and neutralized—correctable $XX$ errors—thereby demonstrating how error correction introduces a directional asymmetry into the system’s evolution and effectively terminates the causal influence of certain errors at the point of syndrome measurement.$

New research illuminates how the direction of time emerges within quantum error correction, revealing dependencies between qubits and the initial state of a system.

Frozen in Time: Controlling Quantum Interference with Atom Arrays

15.11.2025 by pricpr

Researchers have demonstrated a novel method for manipulating quantum states in many-body systems using programmable arrays of Rydberg atoms.

The Minimal Quantum Circuit for Particle Scattering

14.11.2025 by pricpr

New research reveals that the complex process of SU(N) invariant two-body scattering can be remarkably simplified and expressed using a surprisingly compact quantum circuit.

Taming Quantum Noise with Hidden Symmetries

14.11.2025 by pricpr

Algorithms contending with noise demonstrate that leveraging metastability—a sensitivity to initial conditions—allows selection of those preparing a final state closer to the ideal, as opposed to those succumbing to a fully mixed state despite achieving the same ultimate outcome, effectively mitigating decay under perturbation.

New research reveals that noise in quantum algorithms can settle into predictable states, offering a surprising path towards more robust computation.

Beyond Locality: Unraveling Entanglement in Complex Quantum Systems

14.11.2025 by pricpr

Entanglement entropy scales with subsystem length, exhibiting a volume-law regime that expands with increasing nonlocality; specifically, stronger nonlocality—as evidenced by parameters up to $1000$—significantly enhances this volume-law scaling, sustaining it across a broader range of subsystem lengths and fundamentally altering the entanglement structure.

New research explores how breaking the rules of local interactions impacts the fundamental properties of quantum entanglement.