Speaker
Prof.
Marek Zukowski
Description
We show that any multi-qudit entanglement witness leads to a
non-separability indicator for quantum optical fields, which
involves intensity correlation measurements and is useful
for field states of undefined photon numbers. With the
approach we get, e.g., necessary and sufficient conditions
for intensity or intensity-rates correlations to reveal
polarization entanglement. We also derive separability
conditions for experiments with mutually unbiased multiport
interferometers. Within the standard detector inefficiency
model these entanglement indicators work for any detection
efficiencies. For specific cases, we show advantages of
using local intensity rates rather than intensities. The
approach with rates allows a mapping of Bell inequalities
for qudits to ones for optical fields. Our results may find
applications also in studies of non-classicality of
correlations in "macroscopic" many-body quantum systems of
undefined or uncontrollable number of constituents.
[arXiv:1903.03526 ]
Primary author
Prof.
Marek Zukowski
