Molecular Alignment on Demand
![Symmetric molecules experience enhanced, unidirectional field-free orientation via a single resonant pulse that selectively couples an initial rotational state [latex]|J_0K_0M_0\rangle[/latex] to an adjacent state [latex]|J_0+1K_0M_0\rangle[/latex], a process demonstrated through a two-state excitation model where the angle [latex]\theta[/latex] between the molecular axis and laser polarization dictates the resulting periodic evolution and angular distribution of the rotational wave packet.](https://arxiv.org/html/2512.21012v1/fig1.png)
Researchers have devised a method for precisely controlling the orientation of molecules in space using only carefully shaped light pulses.
Science
Hot Hydrogen’s Hidden Impact on Planetary Atmospheres
![The study details state-to-state cross sections-[latex]\sigma_{j=0\to j^{\prime}}[/latex]-for collisions between carbon dioxide and hydrogen, demonstrating how reaction pathways diverge based on initial and final energy states at selected collision energies.](https://arxiv.org/html/2512.21044v1/x1.png)
New quantum calculations reveal that current models of atmospheric escape may significantly overestimate collision rates between hydrogen and carbon dioxide.
Spin Control at Telecom Wavelengths: A Quantum Dot Advance
![The reconstructed trajectory of a ground state hole spin reveals coherent precession, characterized by damped oscillatory behavior in its [latex]S_x[/latex], [latex]S_y[/latex], and [latex]S_z[/latex] components, and a precession plane inclined relative to the conventional [latex]y-z[/latex] plane, indicating complex dynamics within the ground state.](https://arxiv.org/html/2512.20870v1/Section_2/figure_4.png)
Researchers have achieved full quantum-state tomography of a heavy-hole spin within a quantum dot operating in the crucial telecom C-band.
Squeezing the Quantum State: Multiplets and Phase Space
This review explores the unique properties of squeezed quantum multiplets and their representation in phase space, paving the way for more robust quantum technologies.
Beyond Qubits: Achieving Universal Quantum Computation with Simpler Systems
New research demonstrates that universal quantum computation is possible using composite quantum systems with specific dimensional properties, bypassing the need for complex, non-standard quantum gates.
Beyond Disorder: When Waves Defy Localization
![The study demonstrates a clear relationship between disorder and eigenstate characteristics, revealing that increasing disorder transitions systems from delocalized states to Anderson-localized states, with intermediate scarred states appearing at specific energy levels-a progression quantified by the inverse participation ratio [latex]\mathrm{IPR}\_{2}[/latex] and observed within simulations employing parameters [latex]r\_{0}=0.8[/latex], [latex]d=0.03[/latex], [latex]V\_{0}=20[/latex], [latex]a=2[/latex], and [latex]L=5[/latex].](https://arxiv.org/html/2512.20788v1/Figs/noise_vs_energy.png)
New research reveals a surprising interplay between localized and extended states in disordered two-dimensional systems, challenging conventional understanding of wave behavior.
Squeezing the Most from Entangled States
![The protocol distills a target [latex]\rho_{R}(p)[/latex] state from an initial state [latex]\rho_{AB}^{\<i>}[/latex] via an optimized channel, demonstrating that output fidelity and successful distillation probability are directly influenced by the parameter </i>p* within the target state itself.](https://arxiv.org/html/2512.21310v1/fidelity-prob_one_example.png)
New research demonstrates a powerful optimization framework for enhancing entanglement distillation, even when dealing with noisy or weakly connected quantum systems.
Harnessing Superconductivity for Quantum Computing
![The abrupt loss of electrical resistance in certain metals at cryogenic temperatures, illustrated by the curve’s descent to zero, demonstrates the phenomenon of superconductivity - a state where [latex]R=0[/latex] and current flows unimpeded.](https://arxiv.org/html/2512.20913v1/x1.png)
This review provides a complete guide to superconducting quantum circuits, exploring the physics and engineering behind this leading platform for building a quantum computer.
Quantum Computers Tackle a Long-Standing Physics Problem
Researchers have demonstrated a quantum computation method for determining the mass gap of asymptotically free theories, opening new avenues for exploring fundamental particle physics.
Mapping Quantum Complexity with Information Lattices
A novel framework decomposes quantum states by scale and position to reveal hidden structure and redundancies in complex systems.