Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-photon amplitude interferometry for precision astrometry   Improved quantum sensing of photon wave-functions could provide high
resolution observations in the optical benefiting numerous fields, including
general relativity, dark matter studies, and cosmology. It has been recently
proposed that stations in optical interferometers would not require a
phase-stable optical link if instead sources of quantum-mechanically entangled
pairs could be provided to them, potentially enabling hitherto prohibitively
long baselines. A new refinement of this idea is developed, in which two
photons from different sources are interfered at two separate and decoupled
stations, requiring only a slow classical information link between them. We
rigorously calculate the observables and contrast this new interferometric
technique with the Hanbury Brown & Twiss intensity interferometry. We argue
this technique could allow robust high-precision measurements of the relative
astrometry of the two sources. A basic calculation suggests that angular
precision on the order of 10 microarcsecond could be achieved in a single
night's observation of two bright stars.

22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th