Quantum imaging attempts to exploit the quantum features of light in order to enhance one or more aspects of classical imaging. Here we focus on two quantum imaging schemes – ghost imaging and interaction-free imaging – and moreover, on their combination. After a brief overview of the subject we report the main result: a laboratory demonstration of a new imaging scheme termed Interaction-Free Ghost Imaging. We then explain its merits for the task of imaging various structured objects. Next, we discuss an outgrowth of this scheme used for the purpose of nonlocal quantum erasure. We conclude by mentioning some related, low-dose schemes (both quantum and quantum-inspired) for X-ray and gammaray sources.
As a traditional mineral medicine, Lapis Chloriti has attracted much attentions in recent years. Based on the components determined by the X-ray diffraction, the Lapis Chloriti were characterized by the terahertz time domain spectroscopy. Results show that the absorption of sample has positive correlation with concentration. The more mass with Lapis Chloriti, the more absorption. And the absorption becomes more intense with the particle size increasing. In addition, the absorption influenced by other factors are also compared and discussed.
The characteristics of Calamines has been firstly analyzed by terahertz time-domain spectroscopy. Results show that the main composition of the Calamine is calcite. And the terahertz absorption much relates with the particle size, sample thickness, as well as the proportion of polytetrafluorethylene mixed in the sample.
A “comb” structure of beam intensity distribution is designed and achieved to measure a target displacement of micrometer level in laser plasma propulsion. Base on the “comb” structure, the target displacement generated by nanosecond laser ablation solid target is measured and discussed. It is found that the “comb” structure is more suitable for a thin film target with a velocity lower than tens of millimeters per second. Combing with a light-electric monitor, the ‘comb’ structure can be used to measure a large range velocity.
The quantum holography scenario with classical thermal light source based on the second-order correlation measurement is proposed. Contrastive analysis prove that the quantum holography can be carried out with classical thermal light source and entangled two-photon light source. For the second-order correlation measurement in quantum holography, the “unbalanced test system” condition must be satisfied.
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