Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Delayed entanglement echo for individual control of a large number of
  nuclear spins   Methods for achieving quantum control and detection of individual nuclear
spins by single electrons of solid-state defects play a central role for
quantum information processing and nano-scale nuclear magnetic resonance (NMR).
However, with standard techniques, no more than 8 nuclear spins have been
resolved. Here we develop a method that improves significantly the ability to
spectrally resolve nuclear spins and demonstrate its capabilities with detailed
numerical simulations by using a nitrogen-vacancy (NV) centre as model system.
Based on delayed entanglement control, a technique combining microwave and
radio-frequency (rf) fields, nuclei with resonances in a broad frequency band
can be unambiguously and individually addressed by the sensor electron.
Additionally the spectral resolution can extend beyond the electron spin
relaxation time by using a long-lived qubit memory. Our method greatly
increases the number of useful register qubits accessible to a defect centre
and improves the signals of nano-scale NMR.

35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int