Temporal ghost imaging and nonlocal dispersion cancellation with classical light

Kiyoung Cho, Jaewoo Noh

V. Torres-Company, Hanna Lajunen, Ari T. Friberg

In this work, we consider nonlocal dispersion cancellation with classical light in a setup. We demonstrate that the dispersion cancellation phenomenon of temporally entangled two-photon states of light in continuous-wave (CW) pumped SPDC can be similarly obtained in intensity interferometry with classical, stationary radiation that obeys Gaussian statistics. Specifically, we show that the correlation of the intensity fluctuations that would be measured in a setup plays the role of the temporally resolved intensity coincidence detection measured (a) (the original setup for the dispersion cancellation). The only difference is a different dispersion compensation rules which comes from the fact that CW-pumped SPDC photons are anticorrelated in frequency, whereas stationary light has, by definition, uncorrelated spectrum.

Yanhua H. Shih

R. Loudon

Hanna Lajunen, Ari T. Friberg

We show a classical analog of the original nonlocal dispersion cancelation effect in intensity interferometry with stationary light obeying Gaussian statistics. The dispersion compensation is due to the uncorrelation of the spectral components of the radiation. Although this classical counterpart phenomenon is not nonlocal in a strict quantum mechanical sense, it suggests that some second-order interference devices relying on temporal entanglement do not require a quantum light source.

Xin Yao, Wei Zhang, Hao Li +3 more

A thermal ghost imaging scheme between two distant parties is proposed and experimentally demonstrated over long-distance optical fibers. In the scheme, the weak thermal light is split into two paths. Photons in one path are spatially diffused according to their frequencies by a spatial dispersion component, then illuminate the object and record its spatial transmission information. Photons in the other path are temporally diffused by a temporal dispersion component. By the coincidence measurement between photons of two paths, the object can be imaged in a way of ghost imaging, based on the frequency correlation between photons in the two paths. In the experiment, the weak thermal light source is prepared by the spontaneous four-wave mixing in a silicon waveguide. The temporal dispersion is introduced by single-mode fibers of 50 km, which also could be looked at as a fiber link. Experimental results show that this scheme can be realized over long-distance optical fibers.