Robust Ghost Imaging Based on Degenerate Spontaneous Parametric Down-Conversion

Abstract

In traditional ghost imaging, the entangled photon pairs produced from the spontaneous parametric down conversion (SPDC) process are used. There is an intrinsic disadvantage that the utilization efficiency of the photon pairs is very low. Inasmuch as all the correlated photon pairs produced by the degenerate SPDC process can be used to record the image of an object, the ghost imaging scheme we present here has a higher utilization efficiency of the photon pairs. We also investigate the robustness of our experimental scheme. The experimental results show that, no matter whether the photon-pair source is two light cones or two beam-like spots, the clear image of the object can be obtained. The slight rotation of the nonlinear crystal has no influence on the imaging quality. Our experimental results also demonstrate that when the part of the photon-pair source in the signal path or the idler path is blocked by unwanted things, the clear ghost image of the object can still be recorded.

Ghost imaging in a Rician fading channel with additive random noise

“…some practical applications (such as GI for remote sensing [14], GI lidar [15]), the effect of channel characteristics is a very important subject [16,17]. Increasing studies for GI in different channels has been developed [18][19][20][21][22][23], and the preferable robustness of GI have been presented in harsh environments with strong turbulence [18,19], strong scattering [20,21], and the salt noise and pepper noise [22].…”

“…The foregoing research on the scattering channel indicates that the received signal presents strong randomness and weak intensity, and many environmental parameters are needed for analysis in the scattering communication system model. Since the GI mechanism has presented good performance in some scattering or low-light environments [18][19][20][21][22][23], GI may solve the problem of the effective signal detection in low-energy. We wonder whether GI has any advantages in another typical but simplified scattering model: the Rician fading channel.…”