Optimizing the secure key rate of a single sequential quantum repeater with two different quantum memories

Abstract EN

Quantum channels enable the achievement of communication tasks inaccessible to their classical counterparts.

The most famous example is the distribution of secret keys.

Unfortunately, the rate of generation of the secret key by direct transmission is fundamentally limited by the distance.

This limit can be overcome by the implementation of a quantum repeater.

In order to boost the performance of the repeater, a quantum repeater based on cut-off with two different types of quantum memories is suggestd, which reduces the effect of decoherence during the storage of a quantum state.