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Light pulse characteristic rapid detection system based on strong and weak combined measurement

A detection system, light pulse technology, applied in the direction of instruments, can solve the problem of long time, achieve the effect of mature equipment, obvious observation effect, rich theoretical and experimental experience

Active Publication Date: 2015-09-02
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

Method used

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  • Light pulse characteristic rapid detection system based on strong and weak combined measurement
  • Light pulse characteristic rapid detection system based on strong and weak combined measurement
  • Light pulse characteristic rapid detection system based on strong and weak combined measurement

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Embodiment Construction

[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-1A 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-l...

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Abstract

The present invention provides a light pulse characteristic rapid detection system based on strong and weak combined measurement. The technical scheme is that the light pulse characteristic rapid detection system based on the strong and weak combined measurement comprises a light pulse adjusting device, weak measurement devices, strong measurement devices and information reading devices, and is characterized in that n grades of beam splitter sets are also arranged between the light pulse adjusting device and the weak measurement devices, and the n-grade beam splitter set comprises a (2<n>-1) 50 / 50 beam splitters; the light emitted out from the light pulse adjusting device enters the first-grade beam splitter set, the emergent light of the first-grade beam splitter set is two beams of light having the same characteristic, and the two beams of light enter two 50 / 50 beam splitters of the second-grade beam splitter set respectively; by parity of reasoning, 2<n> beams of beam splitting light having the same characteristic are emitted out, and each beam splitting light passes one weak measurement device, one strong measurement device and one information reading device orderly. According to the present invention, the light paths of the detection system can be prevented from being adjusted frequently on the condition that the measurement precision changes rarely, thereby shortening the time of obtaining the light pulse quantum states.

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...

Claims

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Application Information

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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
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