Quantum tunneling

Quantum tunneling is the quantum mechanical phenomenon where a wavefunction can propagate through a potential barrier.

It is possible for spin-zero particles to travel faster than the speed of light when tunneling. This apparently violates the principle of causality, since a frame of reference then exists in which the particle arrives before it has left.

An experiment done in 2020, overseen by Aephraim Steinberg, showed that particles were able to tunnel at speeds faster than light. Since then, the basic principles of tunneling were used in the construction of faster than light devices.