A W-Shaped Self-Supervised Computational Ghost Imaging Restoration Method for Occluded Targets.

We developed a novel method based on self-supervised learning to improve the ghost imaging of occluded objects. In particular, we introduced a W-shaped neural network to preprocess the input image and enhance the overall quality and efficiency of the reconstruction method. We verified the superiority of our W-shaped self-supervised computational ghost imaging (WSCGI) method through numerical simulations and experimental validations. Our results underscore the potential of self-supervised learning in advancing ghost imaging.

Realization of the unconventional photon blockade based on a three-wave mixing system.

In this paper, the unconventional photon blockade is studied in a three-wave-mixing system with a non-degenerate parametric amplification. A method of only retaining the Fock-state basis in the interference path is used to calculate the optimal analytic conditions of unconventional photon blockade. The numerical results agree well with the analytic conditions, which verifies the validity of this method. Our calculations indicate that the strong photon antibunching can be obtained in the high-frequency mode of the three-wave mixing. And the influence of system parameters on photon blockade is also discussed.

Phase transition-induced changes in the Raman properties of DMSO/benzene binary systems.

The Raman spectra of dimethylsulfoxide (DMSO)/benzene binary mixtures were studied by decreasing the temperature from 333 K to 263 K with the aim to reveal the molecular interaction properties during phase transition. The intensity of the Raman band for benzene at 992 cm-1 showed an increasing trend in the liquid and solid phases, while it exhibited a highly decreasing trend during the liquid-solid phase transition. The potential energy was calculated to study the effect of intermolecular interaction distance between DMSO and benzene on Raman intensity. The observations indicated that the blueshift of the low-frequency bands of DMSO was significantly different from the redshift of its high-frequency bands. The hydrogen bond generated between DMSO and benzene was well formed in the binary systems. This interaction inducing an enhanced hydrogen bond between the binary systems and attenuated C-H bonds led to opposite Raman shift variations with decreasing temperature. The Raman bands of DMSO at 1425 cm-1, 2899 cm-1, and 2992 cm-1 each split into two peaks after phase transition. The splitting of the Raman bands of DMSO at 1417 cm-1, 2895 cm-1, and 2982 cm-1 cropped up as the temperature dropped to the transformation point of 288 K. This is attributed to the phase transition-induced latent def.(C7) atomic vibrations corresponding to the individual methyl groups of DMSO. The implications of these analyses are expected to be helpful to understand the effect of phase transition on the Raman properties of binary solutions.

Kerr-nonlinearity enhanced conventional photon blockade in a second-order nonlinear system.

The conventional photon blockade (CPB) for high-frequency mode is investigated in a second-order nonlinear system with Kerr nonlinearity. By solving the master equation and calculating the zero-delay-time second-order correlation function g(2)(0), we obtain that strong photon antibunching can be achieved in this scheme. The optimal condition for strong antibunching is also calculated analytically and discussed in detail. We find that the Kerr nonlinearity can largely enhance the CPB effect in the high-frequency mode, and this scheme is not sensitive to the reservoir temperature. In addition, when compared with the linear coupled system, the system has obvious advantages in CPB implementation.

Chaotic control and synchronization in optical second-harmonic generation with parameter modulating by delay feedback.

Chaotic behaviors can be controlled and converted into periodic behaviors by modulating the cavity detuning parameters using delay feedback signal from itself in optical second-harmonic generation (OSHG) system. Numerical simulations show that the period orbit differs on the account of the modulating coefficient and delay time. When the modulating coefficient and delay time are matching, many OSHG systems, whether or not they are in chaos initially, can reach chaotic synchronization if they are driven by a master system and their cavity detuning parameters are varied with the time-delay feedback chaotic signal. Different modulating coefficients with the corresponding minimum delay time are calculated.