PAPER PLAINE

Physicists have designed a way to control magnetic behavior in one material by attaching a quantum magnetic layer next to it. The quantum layer acts like a bath that damps and drives the classical magnetic material, creating new ways to tune how magnetic waves, domain walls, and skyrmions (tiny magnetic vortices) move and disappear. This could let engineers manipulate magnetic dynamics without direct electrical or magnetic contact.

Researchers built a device that converts signals between microwave circuits in quantum computers and optical fibers with less thermal noise than previous designs. By combining two materials—silicon and lithium niobate—using a precise printing technique, they achieved the strong signal conversion needed for practical quantum-to-optical communication.

A quantum state satisfies a "strong Markov property" if you can recover lost information about it by measuring just one copy and applying a local fix — and this works the same way regardless of what you actually measure. The researchers show this property is equivalent to a simpler mathematical condition: correlations must decay in a particular way, and they prove three surprising consequences, including that you can estimate multiple properties of a quantum state from a single measurement.

Researchers demonstrated that quantum computers can simulate how fluids move and mix under varying flow patterns — a step toward realistic fluid dynamics calculations on quantum hardware. Using IonQ's trapped-ion systems, they solved the advection-diffusion equation in three dimensions and identified a major bottleneck: repeatedly reading out and reloading fluid density data. They propose using a technique called MPS shadow tomography to make this process faster at scale.