This study explores dimensionality reduction in fluid dynamics using “autoencoder”, a nonlinear machine learning method, to represent complex flows with fewer variables and more efficiently than with traditional linear techniques.  

A softening phenomenon below 1 K was discovered in diamond, the hardest known material, suggesting the presence of a hidden quantum ground state with electric quadrupolar degrees of freedom arising from lattice defects.

”Second-order fringes” rings a bell? ”Which-path” echoes a quantum sequel?
”Spoofing decoherence” sounds like a plan? All this is not about photons, actu-
ally. Fast forward, and let the answer reveal itself soon.  Oops, too loud?

The coupled dynamics between quantum turbulence and normal-fluid turbulence is investigated via advanced numerical simulations. Our simulations show that quantum turbulence can be enhanced by normal-fluid turbulence through internal mutual friction.

Superfluid ⁴He droplets exhibit robustly quantized dripping periods despite gradually varying input flow rates owing to their high amplitude and undamped oscillation.

A one-way optical waveguide was realized on the boundary between two types of photonic crystals with different topological properties, which were demonstrated by high-resolution infrared reflection measurements.

This Special Topics Edition of the JPSJ describes the latest advances in the field of biofluid locomotion, shedding light on the underlying physics behind the movement of organisms that swim and fly.

This review article summarizes the latest progress on Jeffery’s orbits and how they relate to the motion of microswimmers of various shapes, including sperms, bacteria, and even microrobots.

Red blood cells flowing through square capillary tubes were observed to migrate towards four points located on the diagonal in the tube cross-section, owing to their deformability and inertia.

Dynamics of photoinduced quantum entanglement generation between phonons is theoretically revealed. The results contribute to the study of fundamental theoretical problems within quantum dynamics of photoinduced phase transitions and quantum information science.

The coupling between surface acoustic waves and spin waves is shown to depend strongly on the angle between the acoustic wavevector and magnetization. For a particular angle, it completely vanishes in one direction, which enables a unidirectional generation of surface acoustic waves by a ferromagnetic resonance.