Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hybrid quantum magnetism in circuit-QED: from spin-photon waves to
  many-body spectroscopy   We introduce a model of quantum magnetism induced by the non-perturbative
exchange of microwave photons between distant superconducting qubits. By
interconnecting qubits and cavities, we obtain a spin-boson lattice model that
exhibits a quantum phase transition where both qubits and cavities
spontaneously polarise. We present a many-body ansatz that captures this
phenomenon all the way, from a the perturbative dispersive regime where photons
can be traced out, to the non-perturbative ultra-strong coupling regime where
photons must be treated on the same footing as qubits. Our ansatz also
reproduces the low-energy excitations, which are described by hybridised
spin-photon quasiparticles, and can be probed spectroscopically from
transmission experiments in circuit-QED, as shown by simulating a possible
experiment by Matrix-Product-State methods.

15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
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The categories of this paper are: q-fin
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int