Quantum Key Distribution over Collective Amplitude Damping Quantum Channels


One of the most mature quantum information techniques nowadays is Quantum Key Distribution (QKD) in which two legitimate parties make use of a protocol to create a symmetric private key using a quantum channel. The quantum channel is not secure, since there may be an eavesdropper intercepting and re-sending the quantum states that are sent through it. One of the main problems in using QKD protocols is the existence of noise which can make difficult the task of eavesdropping checking. Considering these issues, this paper presents a QKD protocol over a collective amplitude damping quantum channel that makes use of decoherence-free subspaces and subsystems. The QKD protocol proposed is noiseless despite the errors existing in the quantum channel. Moreover, it makes the probability of the eavesdropper’s retrieve the secret message negligible asymptotically. Besides, the probability of eavesdropper detection is stable during the whole communication which eases the eavesdropping checking procedures.

In: VIII International Multi-Conference on Computing in the Global Information Technology. Nice - France.