Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tapering of fs Laser-written Waveguides   The vast development of integrated quantum photonic technology enables the
implementation of compact and stable interferometric networks. In particular
laser-written waveguide structures allow for complex 3D-circuits and
polarization-encoded qubit manipulation. However, the main limitation for the
scale-up of integrated quantum devices is the single-photon loss due to
mode-profile mismatch when coupling to standard fibers or other optical
platforms. Here we demonstrate tapered waveguide structures, realized by an
adapted femtosecond laser writing technique. We show that coupling to standard
single-mode fibers can be enhanced up to 77% while keeping the fabrication
effort negligible. This improvement provides an important step for processing
multi-photon states on chip.

34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio