Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hybrid Quantum-Classical Approach to Quantum Optimal Control   A central challenge in quantum computing is to identify more computational
problems for which utilization of quantum resources can offer significant
speedup. Here, we propose a hybrid quantum-classical scheme to tackle the
quantum optimal control problem. We show that the most computationally
demanding part of gradient-based algorithms, namely computing the fitness
function and its gradient for a control input, can be accomplished by the
process of evolution and measurement on a quantum simulator. By posing queries
to and receiving messages from the quantum simulator, classical computing
devices update the control parameters until an optimal control solution is
found. To demonstrate the quantum-classical scheme in experiment, we use a
nine-spin nuclear magnetic resonance system, on which we have succeeded in
preparing a seven-correlated quantum state without involving classical
computation of the large Hilbert space evolution.

37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom