Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum optimal control via gradient ascent in function space and the
  time-bandwidth quantum speed limit   A gradient ascent method for optimal quantum control synthesis is presented
that employs a gradient derived with respect to the coefficients of a
functional basis expansion of the control. Restricting the space of allowable
controls to weighted sums of the Slepian sequences efficiently parameterizes
the control in terms of bandwidth, resolution and pulse duration. A bound
showing minimum time evolutions scaling with the inverse of the control
bandwidth [S. Lloyd and S. Montangero, PRL, 113, 010502, (2014)] is recovered
and the method is shown numerically to achieve the bound on entangling
two-qubit quantum gates.

1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph