Quantum networks have the potential to revolutionize technologies ranging from secure communication and distributed quantum information processing to distributed sensing and clock networks. To unlock the potential of quantum networks, highly coherent network nodes efficiently interfaced with low loss optical channels are needed. To that end, using neutral atoms as stationary qubits is particularly appealing because of their great coherence properties. Furthermore, individual atoms can be coupled to nanophotonic crystal cavities providing highly efficient light-matter interfaces as demonstrated in recent experiments.
Related literature:
Strong coupling of two individually controlled atoms via a nanophotonic cavity
arXiv:1909.09108 (2019)
Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres
Nature 526, 682 (2016); arXiv
Heralded entanglement between solid-state qubits separated by three meters
Nature 497, 86 (2013); arXiv
Topic review:
Wehner, Elkoss, Hanson: Quantum internet: A vision for the road ahead
Science 362, 303 (2018)
Kimble: The quantum internet
Nature 453, 1023 (2008)