Towards inter-city entanglement generation using solid state spins in diamond.

Large scale networks where entanglement is generated and exploited between nodes are of great interest for both practical applications as well as fundamental tests of nature[1]. The NV-centre in diamond provides an excellent platform for realizing such a network, with recent work demonstrating fast entanglement generation[2] and entanglement between the NV-centre qubit and a telecom photon [3]. In this talk I will show latest experimental progress towards generating entanglement between two Dutch cities via 30km of fibre. This experiment will be the first link in a metropolitan scale quantum network in the Netherlands, which will serve as a test bed for the development of the Quantum Internet.


[1] S. Wehner et al, Science 362 (2018)
[2] P. C. Humphreys et al, Nature 558, 268–273 (2018)
[3] A. Tchebotareva et al, PRL 123 (2019)