Scientists Entangle a Tiny Glass Particle With Light at Room Temperature

Physicists have achieved a striking quantum experiment by linking the motion of a tiny glass particle with light, while keeping the surrounding laboratory at room temperature.

The experiment involved a glass nanosphere measuring about 100 nanometers across, roughly the size of a virus. Although extremely small, the particle contains tens of millions of atoms.

A Glass Particle Floating in Light

Researchers from the University of Florence and their colleagues used a tightly focused laser beam to suspend the glass particle in the air. The particle was held inside a near-vacuum chamber and allowed to move slightly around its trapped position.

Instead of cooling the entire experimental apparatus to extremely low temperatures, the scientists used lasers to cool the particle’s motion. This allowed its mechanical movement to approach the delicate conditions required for observing quantum effects.

Creating Quantum Entanglement

The team used two different laser wavelengths for separate tasks. One helped cool and stabilize the particle’s motion, while another created a connection between the particle’s movement and the properties of light.

The researchers then measured the light leaving the optical cavity. The measurements showed correlations that crossed the threshold used to distinguish quantum entanglement from ordinary classical correlations.

Why the Result Is Interesting

Quantum entanglement is usually associated with extremely small particles such as photons and atoms. Demonstrating it with the collective motion of a nanosphere containing millions of atoms gives scientists another way to study how quantum behavior can appear in larger physical systems.

The experiment is also notable because the quantum correlations were carried by light that continued traveling after leaving the optical cavity. In principle, this could make such a system more useful for future experiments involving quantum communication and connections between different quantum devices.

What Comes Next

The researchers say the experiment is an important starting point rather than a finished quantum technology. Future work will focus on making the entanglement stronger and controlling it dynamically.

Scientists will also investigate whether similar systems could eventually be connected together, potentially creating larger networks of mechanically controlled quantum systems.

Sources

• Science — “Stationary entanglement of a levitated oscillator with an optical field,” 2026.
• ScienceAlert — “Physicists Quantum-Entangled a Levitating Speck of Glass With Light at Room Temperature,” October 2, 2026.
• University of Florence research team — Experimental work on levitated quantum optomechanics, 2026.