Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct Observation of Broadband Nonclassical States in a
  Room-temperature Light-matter Interface   Nonclassical state is an essential resource for quantum-enhanced
communication, computing and metrology to outperform their classical
counterpart. The nonclassical states that can operate at high bandwidth and
room temperature while being compatible with quantum memory are highly
desirable to enable the scalability of quantum technologies. Here, we present a
direct observation of broadband nonclasscal states in a room-temperature
light-matter interface, where the atoms can also be controlled to store and
interfere with photons. With a single coupling pulse and far off-resonance
configuration, we are able to induce a multi-field interference between light
and atoms to create the desired nonclassical states by spectrally selecting the
two correlated photons out of seven possible emissions. We explicitly confirm
the nonclassicality by observing a cross correlation up to 17 and a violation
of Cauchy-Schwarz inequality with 568 standard deviations. Our results
demonstrate the potential of a state-built-in, broadband and room-temperature
light-matter interface for scalable quantum information networks.

33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
16
The categories of this paper are: stat