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

Zhen-Yu Wang (), Jorge Casanova () and Martin B. Plenio ()
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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

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms14660

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