104th CEMS Colloquium

Title

Towards large-scale networks powered by quantum entanglement

Abstract

Future quantum networks [1] may harness the unique features of entanglement in a range of exciting applications, such as quantum computation and simulation, secure communication, enhanced metrology for astronomy and time-keeping as well as fundamental investigations. To fulfill these promises, a strong worldwide effort is ongoing to gain precise control over the full quantum dynamics of multi-particle nodes and to wire them up using quantum-photonic channels.

Here, we introduce recent work towards large-scale entanglement-based quantum networks. We report on the realization of a three-node entanglement-based quantum network based on diamond NV centers in the lab. We demonstrate several quantum network protocols without post-selection: the distribution of genuine multipartite entangled states across the three nodes, entanglement swapping through an intermediary node [2], and qubit teleportation between non-neighbouring nodes [3]. This work establishes a platform for exploring, testing, and developing multi-node quantum network protocols and a quantum network control stack [4,5]. Moreover, we will discuss future challenges and prospects for quantum networks, including increasing the distance between nodes to metropolitan scales [6] and the role of next-generation integrated devices.

[1] S. Wehner, D. Elkouss, R. Hanson, Science 362 (6412), eaam9288 (2018).
[2] M. Pompili, S.L.N. Hermans, S. Baier et al., Science 372, 259-264 (2021).
[3] S.L.N. Hermans, M. Pompili  et al., Nature 605, 663–668 (2022).
[4] M. Pompili, C. Delle Donne et al., arXiv:2111.11332 (2021).
[5] S.L.N. Hermans et al., arXiv:2208.07449 (2022).
[6] A. Stolk, K. L. van der Enden et al., PRX Quantum 3, 020359 (2022).

Inquiries

Quantum Electron Device Research Team
Akemi Ishikawa (akemi.ishikawa @ riken.jp)