Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pinching operators for approximating multiphoton entangled states   We introduce the pinching operator, which extends the theory of squeezing
operators to cubic and higher order non-Gaussian operators, and use it to
approximate $n$-photon entangled states using a pinched vacuum state and
pinching tensor of rank $n$. A simple recursion relation is derived for
generating the Bogoliubov transformed creation and annihilation operators,
which may be used to express the pinched state as a statistically equivalent
set of nonlinearly transformed complex Gaussian random variables. Using this
representation, we compare low-order approximations of the pinched state to
entangled multiphoton Fock states, such as Greenberger-Horne-Zeilinger (GHZ)
and W states. Using post-selection and a threshold detector model to represent
non-Gaussian measurements, we find that this model is capable of producing
states with a fidelity comparable to that of experimentally prepared
multiphoton entangled states.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics