Low-overhead entangled light quantum target imaging method based on ranging assistance

A target imaging and photon technology, applied in the field of quantum information, can solve the problems of large time overhead, limited practical application of quantum imaging, and low imaging efficiency.

Pending Publication Date: 2022-07-29
CHONGQING UNIV OF POSTS & TELECOMM
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  • Description
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  • Application Information

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Problems solved by technology

However, at present, quantum imaging still has the problem of low imaging efficiency. Obtaining high-resolution quantum

Method used

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  • Low-overhead entangled light quantum target imaging method based on ranging assistance
  • Low-overhead entangled light quantum target imaging method based on ranging assistance
  • Low-overhead entangled light quantum target imaging method based on ranging assistance

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Experimental program
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Embodiment Construction

[0026] specific implementation

[0027] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0028] Step 1: Use a laser to generate pump light with a wavelength of 405 nm;

[0029] Step 2: Use lenses with focal lengths of 100mm and 50mm to form a beam reduction combination to reduce the pump light to concentrate its energy;

[0030] Step 3: The pump light is modulated into linearly polarized light by using a half-wave plate and a quarter-wave plate with a transmission wavelength of 405 nm, so as to improve the efficiency of the spontaneous parametric down-conversion process of the PPKTP crystal;

[0031] Step 4: Prepare quantum entangled light by using the spontaneous parametric down-conversion process of PPKTP crystal, wherein, according to nonlinear optics theory, the down-conversion light intensity I satisfies:

[0032]

[0033] Among them, the symbol "∝" means proportional to, Δk is the phase mismatch, l is the crysta...

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Abstract

The invention provides a low-overhead entangled light quantum target imaging method based on ranging assistance. High-speed target imaging is realized through two coincidence counting operations. The method comprises the following steps: firstly, modulating pump light generated by a laser by using a lens combination and a wave plate combination, and improving the spontaneous parametric down-conversion efficiency of a periodically poled potassium titanyl phosphate (PPKTP) crystal; then, a digital micromirror device (DMD) is controlled to select a local ranging pixel area, and a time pulse difference value sequence about photons collected by the barrel detector and the surface detector is constructed; secondly, completing local coincidence counting by using the time pulse difference sequence to obtain a time difference between a signal light path and a reference light path; thirdly, the DMD is controlled to select a global imaging pixel area, the time pulse sequence obtained by the barrel detector is corrected, and the corrected time pulse sequence is utilized to complete global coincidence counting; and finally, mapping the coincidence count value and the gray value to obtain a quantum gray imaging result of the target.

Description

technical field [0001] The invention belongs to the technical field of quantum information, and is a technology for obtaining the distance and image information of a target by using entangled light, which can obtain the distance information of the target while imaging the target, and can effectively reduce the time overhead of quantum target imaging. Background technique [0002] At present, quantum technology represented by quantum information science is constantly forming new scientific frontiers, including quantum communication, quantum computing and quantum precision measurement. These revolutionary technologies will have a disruptive impact on traditional technologies. [0003] Quantum imaging in the field of quantum precision measurement has become a hot research direction due to its high resolution, strong anti-interference ability, and high confidentiality. Traditional geometric optical imaging is based on the point-to-point spatial correspondence between objects an...

Claims

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Application Information

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IPC IPC(8): G01S17/89G01S17/00G01S17/08G01S7/497G02F1/355
CPCG01S17/08G01S17/006G01S17/89G01S7/497G02F1/3553
Inventor 周牧嵇长银聂伟杨小龙
Owner CHONGQING UNIV OF POSTS & TELECOMM
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