Polarization squeezing in perfectly overlapped quadrature-squeezed ultrashort light pulses

• Published in: Journal of optics. B, Quantum and semiclassical optics Quantum and semiclassical optics, 2005-02, Vol.7 (2), p.70-81
• Main Author: Popescu, F
• Format: Article
• Language: English
• Subjects: Beam trapping, self-focusing and defocusing; self-phase modulation; Beam trapping, self-focusing, and thermal blooming; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Nonclassical field states; squeezed, antibunched and sub-poissonian states; operational definitions of the phase of the field; phase measurements; Nonlinear optics; Optics; Phase conjugation, optical mixing, and photorefractive effect; Phase conjugation, optical mixing; photorefractive and kerr effects; Physics; Quantum fluctuations, quantum noise, and quantum jumps; Quantum optics; Reflectors, beam splitters, and deflectors; Ultrafast processes; optical pulse generation and pulse compression
• ISSN: 1464-4266; 1741-3575
• DOI: 10.1088/1464-4266/7/2/007

We investigate the formation of the polarization-squeezed state of light in different schemes of perfect spatial overlap of quadrature-squeezed ultrashort light pulses produced by self-phase modulation effect in electronic Kerr media. The light polarization is treated in terms of four Stokes operators whose spectra of quantum fluctuations are investigated for each configuration of interest. We establish that the frequency at which the suppression of quantum fluctuations of Stokes operators is the greatest can be controlled by adjusting the linear phase difference between initial coherent pulses. The increase of the intensity of one pulse can squeeze efficiently the quantum fluctuations of Stokes operators. We study the spatial overlap of quadrature-squeezed pulses produced in an anisotropic electronic Kerr medium and show that the cross-phase modulation which occurs in addition to the self-phase one can be employed to control the fluctuation spectra of Stokes operators. The change of the nonlinear phase shift per photon for one pulse controls effectively the polarization squeezing. The spatial overlap of a coherent pulse with an interference one, produced by mixing two quadrature-squeezed pulses on a beam splitter, is analysed. It is found that squeezing is produced in three of the four Stokes operators, with the squeezing in the first two being simultaneous.