Quantum information and communication technology will lead us to the new era of ultra‐fast
and absolute‐secure networks. With the emergence of quantum supremacy on the horizon,
the security of various classical encryption systems soon may be deemed obsolete. As a
remedy, quantum key distribution (QKD) is proposed as a novel quantum‐based secret keys
exchange, which is developed to solve the problems of legacy encryption. It is anticipated
that QKD will provide stronger security for future communication systems even in the …