  In the context of the quantum-mechanical description of single-molecule
surface-enhanced Raman scattering, intensity-field correlation measurements of
photons emitted from a plasmonic cavity are explored, theoretically, using the
technique of conditional homodyne detection. The inelastic interplay between
plasmons and vibrations of a diatomic molecule placed inside the cavity can be
manifested in phase-dependent third-order fluctuations of the light recorded by
the aforesaid technique, allowing us to reveal signatures of non-classicality
(indicatives of squeezing) of the outgoing Raman photons.
