Qubit teleportation between non-neighbouring nodes in a quantum network

Journal Article (2022)
Author(s)

S.L.N. Hermans (TU Delft - QID/Hanson Lab)

M. Pompili (TU Delft - QID/Hanson Lab, Kavli institute of nanoscience Delft)

H.K.C. Beukers (Kavli institute of nanoscience Delft, TU Delft - QID/Hanson Lab)

S. Baier (TU Delft - QID/Hanson Lab, Kavli institute of nanoscience Delft)

Johannes Borregaard (Kavli institute of nanoscience Delft, TU Delft - QN/Borregaard groep)

R. Hanson (Kavli institute of nanoscience Delft, TU Delft - QID/Hanson Lab)

Research Group
QID/Hanson Lab
Copyright
© 2022 S.L.N. Hermans, M. Pompili, H.K.C. Beukers, S. Baier, J. Borregaard, R. Hanson
DOI related publication
https://doi.org/10.1038/s41586-022-04697-y
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 S.L.N. Hermans, M. Pompili, H.K.C. Beukers, S. Baier, J. Borregaard, R. Hanson
Research Group
QID/Hanson Lab
Issue number
7911
Volume number
605
Pages (from-to)
663-668
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Abstract

Future quantum internet applications will derive their power from the ability to share quantum information across the network1,2. Quantum teleportation allows for the reliable transfer of quantum information between distant nodes, even in the presence of highly lossy network connections3. Although many experimental demonstrations have been performed on different quantum network platforms4–10, moving beyond directly connected nodes has, so far, been hindered by the demanding requirements on the pre-shared remote entanglement, joint qubit readout and coherence times. Here we realize quantum teleportation between remote, non-neighbouring nodes in a quantum network. The network uses three optically connected nodes based on solid-state spin qubits. The teleporter is prepared by establishing remote entanglement on the two links, followed by entanglement swapping on the middle node and storage in a memory qubit. We demonstrate that, once successful preparation of the teleporter is heralded, arbitrary qubit states can be teleported with fidelity above the classical bound, even with unit efficiency. These results are enabled by key innovations in the qubit readout procedure, active memory qubit protection during entanglement generation and tailored heralding that reduces remote entanglement infidelities. Our work demonstrates a prime building block for future quantum networks and opens the door to exploring teleportation-based multi-node protocols and applications2,11–13.

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