Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photons and polaritons in a time-reversal-broken non-planar resonator   From generation of backscatter-free transmission lines, to optical isolators,
to chiral Hamiltonian dynamics, breaking time-reversal symmetry is a key tool
for development of next-generation photonic devices and materials. Of
particular importance is the development of time-reversal-broken devices in the
low-loss regime, where they can be harnessed for quantum materials and
information processors. In this work, we experimentally demonstrate the
isolation of a single, time-reversal broken running-wave mode of a
moderate-finesse optical resonator. Non-planarity of the optical path produces
a round-trip geometrical (Pancharatnam) polarization rotation, breaking the
inversion symmetry of the photonic modes. The residual time-reversal symmetry
between forward-$\sigma^+$/ backwards-$\sigma^-$ modes is broken through an
atomic Faraday rotation induced by an optically pumped ensemble of $^{87}$Rb
atoms residing in the resonator. We observe a splitting of 6.3 linewidths
between time-reversal partners and a corresponding optical isolation of $\sim$
20.1(4) dB, with 83(1)% relative forward cavity transmission. Finally, we
explore the impact of twisted resonators on T-breaking of intra-cavity Rydberg
polaritons, a crucial ingredient of photonic materials and specifically
topological optical matter. As a highly coherent approach to time-reversal
breaking, this work will find immediate application in creation of photonic
materials and also in switchable narrow-band optical isolators.

25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin