Bright squeezed vacuum (BSV) states of light
With increasing pump power significantly it is possible to create non-classical states of light with huge photon number per mode. Bright squeezed vacuum is characterized by high photon number correlations, strong correlations between frequency and space modes that make such state of light very promising for different applications in quantum information and quantum optics. The structure and properties of such states of light are different from the biphoton pairs regime and the perturbation theory methods do not work in such situation. That is why new methods and approaches are needed. We investigate spatial and frequency properties and arising strong correlations in BSV from the point of view of collective broadband (Schmidt) modes. We study the mode structure of radiation, dependence of the multiphoton correlations and the mode content with the parametric gain, walk-off effects, different schemes of BSV generation, high-order orbital angular momentum (OAM) in BSV and their strong correlations, etc.
Also we study time-ordering effects in BSV which become crucial with increasing photon numbers. The time ordering effect means that local photon creation processes in nonlinear media must be ordered in time and manifest themselves, for example, in the broadening of the spectrum with increasing pump power.