Imagine placing an object in the air, letting go, and having it remain floating motionless, exactly where you left it, or even suspended upside down without falling. Although it seems to defy everyday intuition, this phenomenon is real and is known as quantum pinning (or flux pinning).
Unlike conventional magnetic levitation—such as two magnets repelling and slipping unstably—quantum pinning occurs in type II superconductors cooled below their critical temperature with liquid nitrogen (at approximately -196 °C). In this state of zero electrical resistance, the material does not completely expel external magnetic lines, but rather allows thin quantum magnetic field filaments to pierce its structure.
The secret to this amazing balance relies on three principles:
- Vortex trapping: These magnetic filaments, called Abrikosov vortices, are literally trapped inside microscopic imperfections in the superconductor's crystal lattice.
- Three-dimensional locking: Any attempt to push, rotate, or tilt the object disturbs the position of the vortices; immediately, the material generates internal electrical currents that restore its original posture with millimeter firmness.
- Frictionless motion: If the underlying magnetic field is uniform, such as on a circular track, the superconductor can rotate or travel at high speed without experiencing mechanical friction.
This visible effect of quantum mechanics on a macroscopic scale already powers prototypes for mass energy storage flywheels, wear-free industrial bearings, and the next generation of ultrafast magnetic levitation transit.
Source: American Physical Society (Physical Review Letters) / Tel Aviv University Superconductivity Group
