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Delayed entanglement echo for individual control of a large number of nuclear spins

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  • Zhen-Yu Wang

    (Institut für Theoretische Physik and IQST, Universität Ulm, Albert-Einstein-Allee 11)

  • Jorge Casanova

    (Institut für Theoretische Physik and IQST, Universität Ulm, Albert-Einstein-Allee 11)

  • Martin B. Plenio

    (Institut für Theoretische Physik and IQST, Universität Ulm, Albert-Einstein-Allee 11)

Abstract

Methods to selectively detect and manipulate nuclear spins by single electrons of solid-state defects play a central role for quantum information processing and nanoscale nuclear magnetic resonance (NMR). However, with standard techniques, no more than eight nuclear spins have been resolved by a single defect centre. Here we develop a method that improves significantly the ability to detect, address and manipulate nuclear spins unambiguously and individually in a broad frequency band by using a nitrogen-vacancy (NV) centre as model system. On the basis of delayed entanglement control, a technique combining microwave and radio frequency fields, our method allows to selectively perform robust high-fidelity entangling gates between hardly resolved nuclear spins and the NV electron. Long-lived qubit memories can be naturally incorporated to our method for improved performance. The application of our ideas will increase the number of useful register qubits accessible to a defect centre and improve the signal of nanoscale NMR.

Suggested Citation

  • Zhen-Yu Wang & Jorge Casanova & Martin B. Plenio, 2017. "Delayed entanglement echo for individual control of a large number of nuclear spins," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14660
    DOI: 10.1038/ncomms14660
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