Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation and storage of spin squeezing via learning-assisted optimal
  control   The generation and storage of spin squeezing is an attracting topic in
quantum metrology and the foundations of quantum mechanics. The major models to
realize the spin squeezing are the one- and two-axis twisting models. Here, we
consider a collective spin system coupled to a bosonic field, and show that
proper constant-value controls in this model can simulate the dynamical
behaviors of these two models. More interestingly, a better performance of
squeezing can be obtained when the control is time-varying, which is generated
via a reinforcement learning algorithm. However, this advantage becomes limited
if the collective noise is involved. To deal with it, we propose a four-step
strategy for the construction of a new type of combined controls, which include
both constant-value and time-varying controls, but performed at different time
intervals. Compared to the full time-varying controls, the combined controls
not only give a comparable minimum value of the squeezing parameter over time,
but also provides a better lifetime and larger full amount of squeezing.
Moreover, the amplitude form of a combined control is simpler and more stable
than the full time-varying control. Therefore, our scheme is very promising to
be applied in practice to improve the generation and storage performance of
squeezing.

24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph