Four Quantum Guardians at the Corners of a Plate ✛ ✎ ✦

Quantum bits (qubits) in superposition — that is, both 0 and 1 at once — work wonders, but collapse from the slightest noise. The solution is to store data not in a single particle, but in collective electromagnetic vortices. Physicists found an elegant way: a cooled square plate of superconductor on a special dielectric gives birth to four such vortices — strictly at the corners. Here, electrons behave like water in a narrow pool: they flow only along the walls, and at opposite edges — in opposite directions. At deep cold, these currents twist into stable whirlpools at the corners.

These vortices are Majorana modes, predicted almost a century ago. Their value is that information is 'woven' into their motion and protected from quantum decoherence (the collapse of quantum states) by geometry itself. Alexei Kitaev and Frank Wilczek figured out how to swap these modes for quantum algorithms. And numerical simulations showed: the device works without ultra-precise materials and even without an external magnetic field — you just need to choose the right sample thickness. The corner quantum-entangled cells promise to become ideal qubits for a quantum computer with long quantum memory and routine quantum measurements.