Ultra-wide frequency tuning quantum light source chip based on type-II parameter down-conversion

A parametric down-conversion and frequency tuning technology, applied in the field of quantum information technology and nonlinear optics, can solve the problems of low wavelength tuning ability, single use, and inability to continuously cover visible light and communication bands.

Active Publication Date: 2021-07-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the world, there are many works that generate signal and idle photon pairs through type II output down-conversion[19-22], but the photon wavelengths are specific and do not have wide tuning capabilities
[0004] In general, so far, whether it is a birefringence matching crystal, or a periodically poled bulk material or a waveguide structure, a crystal or chip can only generate entangled photons in a narrow band, and the wavelength tuning ability is low. , cannot continuously cover the visible light and communication bands, does not have very good function expansion capabilities, has a single function, and has a single purpose

Method used

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  • Ultra-wide frequency tuning quantum light source chip based on type-II parameter down-conversion
  • Ultra-wide frequency tuning quantum light source chip based on type-II parameter down-conversion
  • Ultra-wide frequency tuning quantum light source chip based on type-II parameter down-conversion

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Experimental program
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Effect test

Embodiment 1

[0053] Embodiment 1: the pump light is a fixed-wavelength laser, such as when the wavelength is 454nm, the tuning curve of the change of the polarization period to the wavelength of the class II parametric light is given by image 3 Reflect, the abscissa is the wavelength of the parametric light (nm), and the ordinate is the polarization period (μm). The blue curve in the figure represents the wavelength tuning of the o-polarized parametric light, and the yellow curve represents the wavelength tuning of the e-polarized parametric light (in order to simplify the description , to illustrate here, the abscissa in all the figures in the embodiments is the wavelength of the parametric light, the blue curves are o-polarized light, and the yellow curves are e-polarized light). The polarization period of the degenerate point (corresponding to the wavelength of the parametric light is 908nm) is 2.664μm. Depend on image 3 It can be obtained that the polarization period increases from ...

Embodiment 2

[0056] Embodiment 2: When the fixed wavelength of the pump light laser is 635nm, the change of the polarization period is to the tuning curve of the wavelength of the II type parametric light by Figure 9 , Figure 12 and Figure 13 Reflect, the ordinate is the polarization period (μm), the polarization period of the degeneracy point (corresponding to the wavelength of parametric light is 1370nm) is 6.264μm, since the tuning curve at this time has no minimum period point, so the degeneracy point is set as the starting point Initial polarization period Λ 0 = 6.264 μm. It can be seen from the figure that the polarization period is reduced from 6.264 μm to 5.7 μm (the polarization period increment is ΔΛ=5.7-6.264=-0.564 μm), and the wavelength of the type II parametric light can continuously cover the band from 920nm to 2050nm; for comparison , Figure 10 and Figure 11 They are the wavelength tuning curves of the change of the polarization period to the type I parametric li...

Embodiment 3

[0059] Embodiment 3: When the pumping light is a tunable laser, the curve of the pumping light wavelength changing to tune the wavelength of the II parameter light is given by Figure 16 and Figure 17As shown, the ordinate is the pump light wavelength (nm), the polarization period is 410nm→820nm (the polarization period of the degenerate point) 1.944μm (single-period polarization structure), that is, when the pump light is At 410nm, degenerate photon pairs with a wavelength of 810nm can be generated, and when the wavelength of the pump light is adjusted from 410nm to 412.5nm (the wavelength of the pump light varies by 2.5nm), the wavelength of the output II parameter light can continuously cover the band from 610nm to 1260nm range, that is, continuous coverage from the visible light band to the near-infrared band. When the wavelength of the pump light is adjusted from 400nm to 412.5nm, the wavelength of the output II parameter light can continuously cover the range of 520nm ...

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Abstract

Disclosed is an ultra-wide frequency tuning quantum light source chip based on type-II parameter down-conversion. A plurality of waveguides which are in a serial or / and parallel combined mode and have polarized domain inversion areas are arranged on a ferroelectric material comprising lithium niobate, and the generated nonlinear process is subjected to type-II parameter conversion through the polarization period design of the domain inversion. In other words, the incident light conversion process under the parametric condition is a polarization combination mode of two kinds of orthogonal polarized light generated by linear polarization pumping. The chip type ultra-wide frequency tuning quantum light source provided by the invention has ultra-wide wavelength tuning capability, can meet various wavelength requirements, and realizes photon frequency conversion and frequency width tuning. The ultra-wide frequency tuning quantum light source chip can be used as a tunable correlated photon source of various wave bands and a wide tuning predictable single photon source, and can be used as a core basic light source of a light quantum information technology.

Description

technical field [0001] The present invention relates to the field of quantum information technology and nonlinear optics, in particular, it utilizes integrated optics technology and ideas to realize chip-based wide-tunable quantum light source. Background technique [0002] In recent years, quantum information technology has developed rapidly, and quantum communication and quantum computing have also been carried out under various conditions. The launch of the quantum science experiment satellite Micius opened the prelude to ultra-long-distance satellite-earth quantum communication, but many different experimental conditions Under the current situation, various requirements are put forward for the entangled photon source and single photon source which are the core resources in quantum information technology. For example, the 800nm ​​band and the 1550nm band are common bands for space quantum communication, but 800nm ​​is easily interfered during the daytime, and it is necess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35H04B10/70H04B10/116H04B10/118
CPCG02F1/3501G02F1/3526G02F1/353H04B10/70H04B10/116H04B10/118
Inventor 徐平薛广太祝世宁
Owner NANJING UNIV
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