Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal control of a quantum sensor: A fast algorithm based on an
  analytic solution   Quantum sensors can show unprecedented sensitivities, provided they are
controlled in a very specific, optimal way. Here, we consider a spin sensor of
time-varying fields in the presence of dephasing noise, and we show that the
problem of finding the optimal pulsed control field can be mapped to the
determination of the ground state of a spin chain. We find an approximate but
analytic solution of this problem, which provides a \emph{lower bound} for the
sensor sensitivity, and a pulsed control very close to optimal, which we
further use as initial guess for realizing a fast simulated annealing
algorithm. We experimentally demonstrate the sensitivity improvement for a
spin-qubit magnetometer based on a nitrogen-vacancy center in diamond.

8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con