Quantum squeezed states under self-defocusing - The effect of dispersion on the squeezing spectrum

А. В. Белинский

An analysis is made of wide-band conversion of quantum fluctuations of radiation in the case of self-interaction of a high-intensity monochromatic wave in a dispersive medium characterized by a cubic nonlinearity. The squeezing spectrum is determined. It is shown that the effective generation of squeezed states is possible only in a limited range of frequencies governed by the dispersion of the medium.

Arkadiusz Orłowski, K. Wódkiewicz

A. D. Jannussis, Vasileios Bartzis

Xiao‐Qing Luo, Zeng-Zhao Li, Tiefu Li +2 more

Kerr-nonlinearity induced self-focusing or self-defocusing effect provides the opportunity for exploring fundamental phenomena related to the light-matter interactions. Here we show that the linear and nonlinear dispersion responses are significantly sensitive to both the detunings and the tunneling strengths of the indirect-excitonic (IX) states in an asymmetric triple quantum dot system. In particular, the nonlinear dispersion properties are dominated by the tunnel-enhanced cross-Kerr nonlinearity from one of the IX states. Meanwhile, by varying the detunings of other IX states, we reveal that the tunnel-enhanced cross-Kerr nonlinearity gives rise to the realization of the self-focusing and self-defocusing effects. Moreover, by taking into account the effect of the longitudinal-acoustic-phonon induced dephasing of the IX states, it is possible to modulate the height and position of the peak of the self-focusing or self-defocusing effect. Our results may have potential applications in nonlinear-optics and quantum-optics devices based on the tunnel-enhanced nonlinearities in this solid-state system.

Seng‐Tiong Ho, N. C. Wong, Jeffrey H. Shapiro

We describe an experiment that generates squeezed states by means of forward four-wave mixing in sodium vapor with a single optical beam. The single-beam arrangement maximizes the pump-probe spatial overlap in the nonlinear medium. Self-focusing (or self-defocusing) is found to be the major limiting factor in achieving optimal squeezing.

A.‐S. F. Obada, Zeinab M. Omar