Microscopically, topological order corresponds to pattern of long-range quantum entanglement (just like superfluid order corresponds to boson condensation).
By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping.
Examples of this include the phenomenon of quantum entanglement, where particles can interact without reference to their separation or the speed of light.
Local realism is a significant feature of classical mechanics, of general relativity, and of electrodynamics; but quantum mechanics has shown that quantum entanglement is possible.