A detection device for high-order coherence and noise characteristics of light field

Abstract

The invention belongs to the field of research of optical field microcosmic statistical characteristics, and proposes an optical field high-order coherence degree and noise characteristic research device on a single photon level. The device includes a semiconductor laser, a polarization controller, a circulator, an optical fiber coupler, an adjustable optical fiber attenuator, an isolator, a halfwave plate, a polarization beam splitter prism, a first collimating lens, an optical fiber, a second collimating lens, an optical attenuator, a focusing lens, a ground glass sheet, a diaphragm, a filter plate, an attenuation plate, a first beam splitter, a second beam splitter, a third beam splitter, a first single-photon detector, a second single-photon detector, a third single-photon detector, afourth single-photon detector and a data acquisition system, wherein eh data acquisition system is connected with signal output ends of the first single-photon detector, the second single-photon detector, the third single-photon detector and the fourth single-photon detector. The optical field high-order coherence degree and noise characteristic research device on the single photon level can research the light field high-order coherence degree and noise characteristics, and can be applied to the field of optical field characteristic research.

Description

technical field [0001] The invention belongs to the research field of microscopic statistical characteristics of light fields, and in particular relates to a detection device for high-order coherence and noise characteristics of light fields at the single photon level. Background technique [0002] Confidential communication is related to many aspects such as national security and social stability, and it is increasingly important to ensure the information security of related systems. According to the "2006-2020 National Informatization Development Strategy", there is an urgent need for information security technology and secure communication. At present, the relatively safe confidential communication mechanism realized by the physical layer is the quantum secure communication based on the basic principles of the uncertainty principle of quantum mechanics and the non-cloning theorem, and the other is the use of macroscopic non-periodic fast random phenomena and synchronizati...

AI Technical Summary

Problems solved by technology

Although the HBT experiment can detect the non-classical effect of the light field, due to the limitation of the detector dead time and quantum efficiency, the measurement error is very large, and the deeper non-classical effect of the light field to be measured cannot be obtained.

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