Parsing Squeezed Light into Polarization Manifolds

Understand

We investigate polarization squeezing in squeezed coherent states with varying coherent amplitudes.

• In contrast to the traditional characterization based on the full Stokes parameters, we experimentally determine the Stokes vector of each excitation manifold separately.
• Only for states with a fixed photon number do the methods coincide; when the photon number is indefinite, our approach gives a richer and deeper description.
• By capitalising on the properties of the Husimi Q function, we map this notion onto the Poincare space, providing a full account of the measured squeezing.