Chiral Networks consist of nodes (for instance two-level atoms), coupled to chiral waveguides. By chiral coupling we mean an asymmetric coupling of the nodes to the left and right propagating guided modes. Chiral networks can also be realized using two-dimensional topological materials with spins or photons.

Remarkably, the driven dissipative dynamics of the network can be described by a chiral Master Equation, which predicts steady states in form of pure states consisting of quantum dimers.

Quantum networks have also applications is the context of Quantum information. In this talk, I will present two results showing how to achieve robust Quantum Communication protocols between two nodes of an imperfect, "dirty", chiral quantum network.

I will first present a model of topologically protected chiral quantum network, which can be realized with Rydberg atoms, and show how to achieve Quantum Communication in the presence of defects.

In a second part, I will discuss the effect of noise in Quantum networks. I will present a new protocol which allows faithful transfer of quantum states between two distant cavities of a quantum network connected by a noisy waveguide. This is a result of the linearity of the overall system (as coupled harmonic oscillators), which allows injected noise propagating ballistically in the waveguide, and acting on both cavities to drop out by quantum interference. Our proposed protocol and quantum optical setups can be realized with state of the art experimental techniques in both photonic and phononic quantum circuits.

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C Dlaska et al 2017 Quantum Sci. Technol. 2 015001
B Vermersch et al 2017 arXiv:1611.10240