A fast detection system for optical pulse characteristics based on combined strength and weakness measurement
A detection system and optical pulse technology, applied in the direction of instruments, etc., can solve the problems of long time and achieve the effect of shortening time and avoiding frequent adjustment of optical path
Active Publication Date: 2017-11-14
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
[0006] Although the existing technology has been able to effectively detect the quantum state of light pulses, the measurement process requires frequent adjustment of the optical path, and the time to obtain the final result is too long
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[0025] The present invention will be described below in conjunction with the accompanying drawings and specific embodiments.
[0026] figure 2 It is a schematic structural diagram of the present invention. The present invention includes an optical pulse adjusting device, a weak measuring device, a strong measuring device, an information reading device, and between the optical pulse adjusting device and the weak measuring device also includes 2 n - 1 x 50 / 50 beam splitter arranged in graded beam splitting, the nth level of beam splitter group consists of 2 n-1 A 50 / 50 beam splitter, where n is the number of beam splitters. The light emitted from the optical pulse adjustment device enters the first-stage beam splitter group, and the first-stage beam splitter group outputs two outgoing lights, and these two outgoing lights enter the two 50 / 50 beam splitter groups of the second-stage beam splitter group respectively. Beam splitter, and so on, after n-level beam splitting of n-...
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The invention provides a fast detection system of light pulse characteristics based on combined measurement of strength and weakness. The technical solution is: including an optical pulse adjustment device, a weak measurement device, a strong measurement device, and an information reading device, and is characterized in that an n-level beam splitter group is also included between the optical pulse adjustment device and the weak measurement device, and the nth level The beam splitter group includes 2n-1 50 / 50 beam splitters; the light emitted from the optical pulse adjustment device enters the first-stage beam splitter group, and the outgoing light of the first-stage beam splitter group is two beams of light with the same characteristics , and respectively enter the two 50 / 50 beam splitters of the second-stage beam splitter group; and so on, a total of 2n beams with the same characteristics are emitted, and each beam passes through a weak measuring device and a strong measuring device in turn. Measuring device, an information reading device. The invention can avoid the frequent adjustment of the optical path of the detection system under the condition that the measurement accuracy does not change much, and greatly shorten the time for obtaining the quantum state of the optical pulse.
Description
technical field [0001] The invention relates to a detector for measuring the characteristics of light pulses. The invention is a system for detecting the quantum state of light pulse, which is characterized in that strong measurement and weak measurement methods are used in combination, and the measurement result can be obtained quickly. Background technique [0002] In quantum mechanics, it is generally believed that the quantum state of a single particle cannot be determined experimentally in principle. However, it is interesting and necessary to measure the quantum states of ensembles of many particles prepared by physical experiments. Single photon detection is the core of weak light measurement technology and plays a key role in the field of quantum information. However, the output of traditional single-photon detectors based on photomultiplier tubes or avalanche diodes is only the count value of photons, not the quantum state of photons, which limits the scope of use...
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IPC IPC(8): G01J11/00
Inventor 陈希张明戴宏毅魏家华
Owner NAT UNIV OF DEFENSE TECH