Distributed entanglement and teleportation on a multi-node quantum network

A future quantum internet can unlock fundamentally new technologies by sharing entangled states and quantum information across the nodes of the network. In the past decade, many buildings blocks of such a network have been demonstrated. In particular, the heralded distribution of entanglement between two physically separated nodes and quantum teleportation has been achieved on various platforms, however connecting multiple nodes into a multi-node quantum network remained an open challenge.

In this talk I will present our results on the experimental realization of a multi-node quantum network. Our network consists of three nodes, Alice, Bob and Charlie. Each node contains a NV center that acts as a communication qubit to generate remote entanglement with neighboring nodes. Additionally, Bob and Charlie have access to a memory qubit in the form of a carbon-13 nuclear spin. On the network we demonstrate the distribution of a genuine multi-partite entangled state, entanglement swapping[1] and qubit teleportation between non-neighboring nodes[2]. Our work establishes a key platform for exploring, testing and developing multi-node quantum network protocols and a quantum network control stack.

 

[1]     M. Pompili, S. L. N. Hermans, S. Baier, H. K. C. Beukers, P. C. Humphreys, R. N. Schouten, R. F. L. Vermeulen, M. J. Tiggelman, L. dos Santos Martins, B. Dirkse, S. Wehner, and R. Hanson, “Realization of a multinode quantum network of remote solid-state qubits,” Science, vol. 372, no. 6539, pp. 259–264, 2021.

[2]     S. L. N. Hermans, M. Pompili, H. K. C. Beukers, S. Baier, J. Borregaard, and R. Hanson, “Qubit teleportation between non-neighboring nodes in a quantum network,” arXiv: 2110.11373v1