Complete tomography of a high-fidelity solid-state entangled spin–photon qubit pair

De Greve, K. et al. (2013) Complete tomography of a high-fidelity solid-state entangled spin–photon qubit pair. Nature Communications, 4, (doi: 10.1038/ncomms3228)

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Entanglement between stationary quantum memories and photonic qubits is crucial for future quantum communication networks. Although high-fidelity spin–photon entanglement was demonstrated in well-isolated atomic and ionic systems, in the solid-state, where massively parallel, scalable networks are most realistically conceivable, entanglement fidelities are typically limited due to intrinsic environmental interactions. Distilling high-fidelity entangled pairs from lower-fidelity precursors can act as a remedy, but the required overhead scales unfavourably with the initial entanglement fidelity. With spin–photon entanglement as a crucial building block for entangling quantum network nodes, obtaining high-fidelity entangled pairs becomes imperative for practical realization of such networks. Here we report the first results of complete state tomography of a solid-state spin–photon-polarization-entangled qubit pair, using a single electron-charged indium arsenide quantum dot. We demonstrate record-high fidelity in the solid-state of well over 90%, and the first (99.9%-confidence) achievement of a fidelity that will unambiguously allow for entanglement distribution in solid-state quantum repeater networks.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hadfield, Professor Robert
Authors: De Greve, K., McMahon, P.L., Yu, L., Pelc, J.S., Jones, C., Natarajan, C.M., Kim, N.Y., Abe, E., Maier, S., Schneider, C., Kamp, M., Höfling, S., Hadfield, R., Forchel, A., Fejer, M.M., and Yamamoto, Y.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Nature Communications
Publisher:Nature Publishing Group
ISSN (Online):2041-1723

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
492622Stanford-Scotland Photonics innovation collaborationSheila RowanEngineering & Physical Sciences Research Council (EPSRC)EP/G042446/1P&A - PHYSICS & ASTRONOMY