Possibility of simple and effective suppression of quantum amplitude fluctuations of light

Victor V. Kulagin

The generation of nonclassical states of light with specified frequency-dependent squeezing by way of introducing a correlation between the phase and amplitude of the input field is considered. Three schemes for measuring amplitude fluctuations of the input beam, based on a nondemolition measurement of the intensity in a nonlinear cubic crystal, the effect of light rectification in a quadratic optical crystal, and the use of a non-degenerate optical parametric oscillator, are proposed. The maximum possible value of noise suppression is estimated for each scheme. The prospects for practical realization of the proposed method for generation of frequency-dependent squeezed states are discussed.

P. L. Knight

Dmitriy A. Balakin, Aleksandr V. Belinsky

Images formed by light with suppressed photon fluctuations are interesting objects for studies with the aim of increasing their limiting information capacity and quality. This light in the sub-Poisson state can be prepared in a resonator filled with a medium with Kerr nonlinearity, in which self-phase modulation takes place. Spatially and temporally multimode light beams are studied and the production of spatial frequency spectra of suppressed photon fluctuations is described. The efficient operation regimes of the system are found. A particular schematic solution is described, which allows one to realize the potential possibilities laid in the formation of the squeezed states of light to a maximum degree during self-phase modulation in a resonator for the maximal suppression of amplitude quantum noises upon two-dimensional imaging. The efficiency of using light with suppressed quantum fluctuations for computer image processing is studied. An algorithm is described for interpreting measurements for increasing the resolution with respect to the geometrical resolution. A mathematical model that characterizes the measurement scheme is constructed and the problem of the image reconstruction is solved. The algorithm for the interpretation of images is verified. Conditions are found for the efficient application of sub-Poisson light for super-resolution imaging. It is found that the image should have a low contrast and be maximally transparent.

P. L. Knight

Claude Fabre

Anatoliy S. Chirkin, Natalia Korolkova

We consider polarization-squeezed (PS) light generation in anisotropic homogeneous Kerr medium. The fluctuations of the Stokes parameter either S2 or S3 are suppressed in PS light. The influence of initial light depolarization on the fluctuation suppression of the Stokes parameters is analyzed. We show the possibility to transform PS light into light with sub-Poissonian statistics by linear conversion (phase plate and analyzer). The quantum properties of the SH generated by frequency doubling of the PS light are investigated.