Dmitry Kronberg

An important problem for QKD at long distances is the PLOB bound. It follows from the fact that an eavesdropper can perform any actions with the quantum states sent over the quantum channel, which is a standart assumption in QKD. Here, we propose an alternative model which explicitly uses the restrictions of quantum thermodynamics, which prevent the eavesdropper from exploiting all the photons lost in the channel. We consider this solution as chanel device dependent (CDD) QKD which is better at long distances than conventional QKD with trusted nodes.