Deterministic delivery of remote entanglement on a quantum network

Peter C. Humphreys, Norbert Kalb, Jaco P.J. Morits, Raymond N. Schouten, Raymond F.L. Vermeulen, Daniel J. Twitchen, Matthew Markham, Ronald Hanson*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

260 Citations (Scopus)
144 Downloads (Pure)


Large-scale quantum networks promise to enable secure communication, distributed quantum computing, enhanced sensing and fundamental tests of quantum mechanics through the distribution of entanglement across nodes 1-7. Moving beyond current two-node networks 8-13 requires the rate of entanglement generation between nodes to exceed the decoherence (loss) rate of the entanglement. If this criterion is met, intrinsically probabilistic entangling protocols can be used to provide deterministic remote entanglement at pre-specified times. Here we demonstrate this using diamond spin qubit nodes separated by two metres. We realize a fully heralded single-photon entanglement protocol that achieves entangling rates of up to 39 hertz, three orders of magnitude higher than previously demonstrated two-photon protocols on this platform 14. At the same time, we suppress the decoherence rate of remote-entangled states to five hertz through dynamical decoupling. By combining these results with efficient charge-state control and mitigation of spectral diffusion, we deterministically deliver a fresh remote state with an average entanglement fidelity of more than 0.5 at every clock cycle of about 100 milliseconds without any pre-or post-selection. These results demonstrate a key building block for extended quantum networks and open the door to entanglement distribution across multiple remote nodes.

Original languageEnglish
Pages (from-to)268-273
Number of pages6
Issue number7709
Publication statusPublished - 14 Jun 2018

Bibliographical note

Accepted Author Manuscript

Change history: In this Letter, the received date should be 20 December 2017, instead of 27 April 2018. This has been corrected online.
De daarbij behorende doi 10.1038/s41586-018-0314-9


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