Communication security is vital for our civilization, just think about finance. Quantum cryptography is an upcoming secure communication relying on qubits. A qubit may not only be zero or one, but simultaneously zero and one! If an eavesdropper listens to qubits, she has to affect them, which can be readily noticed by the actual users; thanks to novel concepts from quantum physics such as uncertainty principle, entanglement, nocloning etc. But the current implementations are far from ideal, as the quantum hackers have demonstrated how to crack quantum cryptosystems by taking advantage of non-ideal behavior of the present-day quantum cryptographic hardware. ore hacking and patching cycles are to be expected before it can see daylight.
The logo of a Quantum Hacker group from NTNU