In ideal [quantum] teleportation, the original is destroyed and its exact properties are transmitted to a second, remote particle; the Heisenberg principle does not apply because no definitive measurements are made on the original particle. In telecloning, the original is destroyed, and its properties are sent to not one but two remote particles, with the original's properties reconstructed to a maximum accuracy (fidelity) of less than 100 percent. (The Heisenberg principle limits the ability to make clones as otherwise researchers could keep making copies of the original particle and learn everything about its state.)

[...]

In addition to representing a new quantum-information tool, telecloning may have an exotic application: tapping quantum cryptographic channels. Quantum cryptographic protocols are so secure that they may discover tapping. Nonetheless, with telecloning, the identity and location of the eavesdropper could be guaranteed uncompromised.

Telecloning -- Anonymous eavesdropping on quantum cryptography