Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robust Dynamical Decoupling for Arbitrary Quantum States of a Single NV
  Center in Diamond   Dynamical decoupling is a powerful technique for extending the coherence time
(T$_2$) of qubits. We apply this technique to the electron spin qubit of a
single nitrogen-vacancy center in type IIa diamond. In a crystal with natural
abundance of $^{13}$C nuclear spins, we extend the decoherence time up to 2.2
ms. This is close to the T$_1$ value of this NV center (4 ms). Since dynamical
decoupling must perform well for arbitrary initial conditions, we measured the
dependence on the initial state and compared the performance of different
sequences with respect to initial state dependence and robustness to
experimental imperfections.

37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga