quantum entanglement preservation

A pendulum weighing a few grains of sand swings on a hair-thin glass fiber. Its motions are so faint that the thermal jostling of air molecules seems like a hurricane. Yet such a pendulum is the key to witnessing quantum wonders in the world of large objects.

A topological superconducting nanowire is like a bridge, with two inseparable sentinels — Majorana modes — stationed at its ends. These exotic quasiparticles, predicted back in the 1930s, promise to become the foundation of an error-proof quantum computer.

Quantum entanglement is a fragile thing. Two friends move to different cities, each carrying a box with one of a pair of gloves: if one box has the left glove, the other has the right. Entangled particles behave similarly, except that until measurement, no one knows which is where.

Two photons fly out from a single point in a patient's chest. They are twins: alter one, and you instantly know about the other. This connection is called quantum entanglement. In a PET scan, these pairs are born inside the body when an injected radioactive substance meets electrons in the tissues. The degree of entanglement is not constant.

Quantum sensors are like an orchestra where musicians play in unison: their entangled states let them pick up signals that ordinary instruments can't. But as soon as you start accumulating the signal, the nonlinear interaction, like a conductor who suddenly starts beating time erratically, ruins the music.

Fourteen rubidium atoms lined up like beads on a string. Each atom is a tiny magnet that can point up or down. Together they follow strict rules, similar to a train schedule: everything is predictable, everything repeats. But introduce a barely noticeable change, and the schedule goes off the rails.