Noise-enhanced classical and quantum capacities in communication networks

TL;DR

This paper demonstrates that, contrary to common belief, dephasing noise can enhance both classical and quantum information transmission capacities in quantum communication networks, supported by analytical and numerical evidence.

Contribution

It reveals that noise, specifically dephasing, can improve communication capacities in quantum networks, providing a novel perspective on noise effects in quantum information transfer.

Findings

Dephasing noise can increase classical and quantum capacities.

Analytical and numerical methods confirm capacity enhancement.

Noise can be beneficial in complex quantum network dynamics.

Abstract

The unavoidable presence of noise is thought to be one of the major problems to solve in order to pave the way for implementing quantum information technologies in realistic physical platforms. However, here we show a clear example in which noise, in terms of dephasing, may enhance the capability of transmitting not only classical but also quantum information, encoded in quantum systems, through communication networks. In particular, we find analytically and numerically the quantum and classical capacities for a large family of quantum channels and show that these information transmission rates can be strongly enhanced by introducing dephasing noise in the complex network dynamics.