Diamond quantum networks for distributed quantum computation

A promising approach for quantum computations is to distribute logical qubits and error correction over a quantum network. This approach is naturally extendable to larger sizes by adding independent modules and enables exploring a large variety of error correction codes over different network topologies, including three-dimensional structures and non-nearest neighbor connections.

The NV center in diamond provides a powerful platform to realize such quantum networks. It combines optical entanglement links [Nature 526, 682, 2015] and long-lived multi-qubit nodes that can store and process quantum information [Nature Comm. 7:11526, 2016; Nature Comm. 9:2552,2018]. In this talk I will present our recent experimental progress towards quantum networks for distributed quantum computations and argue that we are getting close to the point where imperfections can be overcome by quantum error correction, so that logical qubits encoded over the network become increasingly more stable as the network is made increasingly larger.