Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Displacing entanglement back and forth between the micro and macro
  domains   Quantum theory is often presented as the theory describing the microscopic
world, and admittedly, it has done this extremely well for decades.
Nonetheless, the question of whether it applies at all scales and in particular
at human scales remains open, despite considerable experimental effort. Here,
we report on the displacement of quantum entanglement into the domain where it
involves two macroscopically distinct states, i.e. two states characterised by
a large enough number of photons to be seen, at least in principle, with our
eyes and that could be distinguished using mere linear - coarse-grained -
detectors with a high probability. Specifically, we start by the generation of
entanglement between two spatially separated optical modes at the single photon
level and subsequently displace one of these modes up to almost a thousand
photons. To reliably check whether entanglement is preserved, the mode is
re-displaced back to the single photon level and a well established
entanglement measure, based on single photon detection, is performed. The
ability to displace an entangled state from the micro to the macro domain and
back again provides a fascinating tool to probe fundamental questions about
quantum theory and holds potential for more applied problems such as quantum
sensing.

22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin