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Entangled light source generating device and method based on multi-waveguide cascade

A production device and production method technology, applied in the field of quantum information, can solve problems such as the quality degradation of entanglement sources, achieve the effects of improving efficiency and quality, increasing energy reuse rate, and meeting the requirements of quality and efficiency

Pending Publication Date: 2021-10-15
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

This leads to a decrease in the ratio of effective coincidences to accidental coincidences (CAR) with increasing pump power, which means that the quality of the entanglement source decreases with increasing pump power

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  • Entangled light source generating device and method based on multi-waveguide cascade
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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the embodiments. This example is a method and device for generating a frequency entangled light source based on double waveguide cascading.

[0028] Pump laser 1: 780nm semiconductor laser

[0029] PPLN waveguide 2: the length is 10 mm, and the polarization period is 8.3 μm. Under the action of the pump laser generated by the pump laser 1, spontaneous parametric down-conversion occurs to generate signal photons s1 and idler photons i1 whose polarizations are orthogonal to each other.

[0030] Wavelength Division Multiplexer (WDM) 3: After the first-order parametric down-conversion, the PPLN waveguide 2 contains the remaining pump light that does not participate in the SPDC process. The wavelength division multiplexer (WDM) 3 is a high-performance filtering device. The pump light and the two-photon pai...

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Abstract

The invention discloses an entangled light source generating device and method based on multi-waveguide cascade. The device comprises a pump laser, a photon generating and filtering device, a polarization beam splitter and a polarization beam combining device. A plurality of levels of photon generating and filtering devices are arranged, a pump laser is connected with the photon generating and filtering devices, each level of photon generating and filtering device is divided into two paths, one path of each level of photon generating and filtering device is connected with a polarization beam splitter, and the other path of each level of photon generating and filtering device is connected with the next level of photon generating and filtering device; each level of polarization beam splitter corresponds to a polarization beam combining device, between two adjacent levels of photon generating and filtering devices, the upper-level polarization beam splitter and the lower-level polarization beam splitter are respectively divided into two paths, one path of the upper-level polarization beam splitter is connected with the polarization beam combining device of the same level, and the other path of the upper-level polarization beam splitter is connected with the polarization beam combining device of the next level; one path of the lower-level polarization beam splitter is connected with the polarization beam combining device of the same-level, and the other path of the lower-level polarization beam splitter is connected with the polarization beam combining device of the upper level. According to the invention, high coincidence counting can still be ensured under the condition of high CAR value. The efficiency and the quality of the quantum entanglement light source are integrally improved.

Description

technical field [0001] The invention relates to the technical field of quantum information, and specifically relates to a device and method for generating entangled light sources based on multi-waveguide cascading. Background technique [0002] Frequency entanglement light source has a wide range of applications in the fields of quantum time synchronization, quantum key distribution, quantum computing, quantum communication and quantum precision measurement. At present, the most commonly used and effective method for generating entangled light sources is the spontaneous parametric down conversion (SPDC) process based on the second-order nonlinear effect. The physical process can be described as a beam of high-frequency pump light acting on a nonlinear medium to generate a pair of low-frequency Photons are commonly referred to as signal photons and idler photons. Photon pairs generated using spontaneous parametric down-conversion processes typically have polarization, angula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02F1/39
CPCG02F1/3503G02F1/3526G02F1/395
Inventor 董瑞芳邢俊杰项晓权润爱刘涛张首刚
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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