Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Reciprocal Transmission and Reflection of a Chirally-Coupled Quantum
  Dot   We report strongly non-reciprocal behaviour for quantum dot exciton spins
coupled to nano-photonic waveguides under resonant laser excitation. A clear
dependence of the transmission spectrum on the propagation direction is found
for a chirally-coupled quantum dot, with spin up and spin down exciton spins
coupling to the left and right propagation directions respectively. The
reflection signal shows an opposite trend to the transmission, which a
numerical model indicates is due to direction-selective saturation of the
quantum dot. The chiral spin-photon interface we demonstrate breaks reciprocity
of the system and opens the way to spin-based quantum optical components such
as optical diodes and circulators in a chip-based solid-state environment.

25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg