Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatial-Dispersion Cancellation in Quantum Interferometry   We investigate cancellation of spatial aberrations induced by an object
placed in a quantum coincidence interferometer with type-II parametric down
conversion as a light source. We analyze in detail the physical mechanism by
which the cancellation occurs, and show that the aberration cancels only when
the object resides in one particular plane within the apparatus. In addition,
we show that for a special case of the apparatus it is possible to produce
simultaneous cancellation of both even-order and odd-order aberrations in this
plane.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex