  The concentration of a chiral solution is a key parameter in many scientific
fields and industrial processes. This parameter can be estimated to high
precision by exploiting circular birefringence or circular dichroism present in
optically active media. Using the Quantum Fisher information formalism, we
quantify the performance of Gaussian probes in estimating the concentration of
chiral analytes. We find that bright-polarization squeezed state probes provide
a quantum advantage over equally bright classical strategies that scales
exponentially with the squeezing factor for a circularly birefringent sample.
Four-fold precision enhancement is achievable using state-of-the-art squeezing
levels and intensity measurements.
