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Device and method for compressing chirp entangled photon pair

A technology of compression device and compression method, which is applied in optics, nonlinear optics, instruments, etc., can solve the problems of entangled light source loss, compression result constraints, etc., and achieve the effect of easy experiment realization and simple operation

Inactive Publication Date: 2016-04-20
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a compression device for chirped entangled photon pairs, which solves the problem that in the existing phase compensation scheme, the entangled light source will be lost through the dispersion medium, and the compression result is restricted by the length of the dispersion medium and the high-order item of the dispersion.

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  • Device and method for compressing chirp entangled photon pair
  • Device and method for compressing chirp entangled photon pair
  • Device and method for compressing chirp entangled photon pair

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Embodiment

[0046] We selected a C-PPKTP crystal with a crystal length of 8mm, and calculated the G 2 (τ) Results. Other parameters are: continuous laser pumping wavelength is λ p =458nm, D=3ps / cm, α=412cm -2 ,n max =20. These selected parameters completely satisfy the above-mentioned two-photon spectral rectangular approximation and linear phase matching conditions. image 3 (a) The thin line gives the G with the quadratic phase factor 2 (τ) Results. It can be seen that the same as the entanglement spectrum is broadened, G 2 (τ) is also widened and also has an approximately rectangular shape with a width of 2.4 ps. image 3 (a) The thick line shows the compression result G after Fresnel binary phase shaping 2 (τ)∝|Σ k ψ ±(2k-1) -Σ k ψ ±2k | 2 ,k=0,1,2...10, the compressed correlation time width is 25.1fs, which is only about 1 / 100 of the original, but the compressed signal strength is 30 times of the original. For convenience of comparison, we will image 3 (a) The thick l...

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Abstract

The invention discloses a device for compressing a chirp entangled photon pair. The device comprises a continuous laser device, wherein a first convex lens, a first nonlinear crystal, a second convex lens, a first light filter, a first collimator, a liquid crystal-spatial light modulator, a second collimator, a third convex lens, a second nonlinear crystal, a fourth convex lens, a second light filter, a fifth convex lens, a single-photon detector and a photon counter are sequentially arranged on a light path at one side of the continuous laser device. The invention further discloses a compressing method adopting the device. According to the device and the method for compressing the chirp entangled photon pair disclosed by the invention, the compression effects are the same as that of a traditional phase compensation scheme; and the defects that the compression result is limited by the dispersive medium length and the dispersive higher-order term and the loss is generated when an entangled photon signal passes through a dispersive medium in the traditional phase compensation scheme are overcome.

Description

technical field [0001] The invention belongs to the technical field of manipulation of entangled photon pairs in quantum optics, and in particular relates to a compression device for chirped entangled photon pairs, and also relates to a method for using the compression device. Background technique [0002] When a chirped quasi-phase-matched nonlinear crystal is pumped by a continuous laser, an ultra-wide-spectrum entangled light source can be generated, that is, chirped entangled photon pairs. This entangled light source can be applied in high-precision quantum optical coherence tomography and large-bandwidth quantum information processing, and can obtain ultra-narrow Hong-Ou-Mandel HOM (Hong–Ou–Mandel) quantum interference results. However, due to the dispersion effect of the crystal, the correlation time of chirped entangled photon pairs is also extended, which is not conducive to its application in quantum weights and measures, quantum lithography and other fields. In or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/355
CPCG02F1/3553
Inventor 李百宏
Owner XIAN UNIV OF SCI & TECH
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