Method for improving mode purity and collection efficiency of quantum-correlated photon pair

A technology of quantum correlation and mode purity, which is applied in the field of optical quantum, can solve the problems of complex preparation process of nonlinear media, and achieve the effect of improving time mode purity and collection efficiency, insensitive to fluctuations of dispersion parameters, and simple preparation process

Active Publication Date: 2017-07-28
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with ordinary media, dispersion-controlled nonlinear media not only have more complex preparation procedures, but also require precise control of various parameters of the media

Method used

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  • Method for improving mode purity and collection efficiency of quantum-correlated photon pair
  • Method for improving mode purity and collection efficiency of quantum-correlated photon pair
  • Method for improving mode purity and collection efficiency of quantum-correlated photon pair

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: Comparison of characteristics of associated photon pairs produced by non-cascaded and cascaded spontaneous four-wave mixing processes

[0042] In this embodiment, the non-cascaded spontaneous four-wave mixing process and the cascaded spontaneous four-wave mixing process in the dispersion-shifted fiber are compared. By simulating the temporal patterns and collection efficiencies of associated photon pairs generated in the two cases, it is demonstrated that cascaded spontaneous parametric processes can improve the temporal pattern and collection efficiency of associated photon pairs. Figure 1a and Figure 1b Shown is a schematic diagram comparing the non-cascaded and cascaded spontaneous four-wave mixing process to generate correlated photon pairs.

[0043] In the case of non-cascaded spontaneous four-wave mixing, such as Figure 1a As shown, the nonlinear medium used is a 600m-long dispersion-shifted fiber, which is pumped by pulsed light, and correlated p...

Embodiment 2

[0047] Embodiment 2: Announcement type single photon source based on cascade spontaneous four-wave mixing process

[0048] The declared single photon source of this embodiment is based on a cascaded structure composed of a section of nonlinear medium, a section of dispersion medium and a section of nonlinear medium in sequence. The device is as image 3 shown. The optical fiber and device parameters in the device are the same as those in Example 1. For the signal and idler photon pairs generated in the cascaded four-wave mixing process, the idler photon is detected by a single photon detector, and the detection signal of the detector is used as the announcement signal, so that the signal photon is projected to the single photon state above, as the output of a declared single-photon source.

[0049] As pointed out in Example 1, both the mode purity and the collection efficiency of correlated photon pairs generated by the cascaded spontaneous four-wave mixing process are impro...

Embodiment 3

[0050] Embodiment 3: Polarization-entangled photon pair generation device based on cascaded spontaneous four-wave mixing process

[0051] In this embodiment, the cascaded spontaneous four-wave mixing process of bidirectional pumping is used to generate polarization-entangled photon pairs. The basic device is as follows Figure 4 shown. The cascaded structure for generating photon pairs consists of a section of dispersion-shifted fiber, a section of single-mode fiber and a section of dispersion-shifted fiber in sequence. The parameters of fiber, pump light and filter are the same as those in Embodiment 1.

[0052] The pulsed pump light enters the polarization beam splitter with a 45-degree linear polarization direction and is split into two beams. A beam whose polarization direction is parallel to the paper is input into the cascade structure clockwise, through the cascade four-wave mixing process, the signal and idler frequency associated photon pairs with the same polarizati...

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Abstract

The invention discloses a method for improving the mode purity and collection efficiency of a quantum-correlated photon pair. The method includes the following steps that a cascade structure sequentially composed of a nonlinear medium, a dispersion medium and a nonlinear medium is adopted; pumping is conducted on the cascade structure by using pulse laser, and the quantum-correlated photon pair is generated through the cascade spontaneous parametric process in the cascade structure; the periodic constructive interference and destructive interference of the quantum-correlated photon pair intensity at different wavelengths occur; the wavelengths corresponding to the constructive interference and the destructive interference can be subjected to tuning by changing the length of a dispersive medium; by using a filtering and collecting device, the quantum-correlated photon pair at the wavelengths corresponding to the constructive interference are collected and output. Based on the cascade structure composed of the nonlinear medium, the dispersion medium and the nonlinear medium sequentially, through the cascade spontaneous parametric process during pulse laser pumping, the mode purity and collection efficiency of the quantum-correlated photon pair is improved.

Description

technical field [0001] The invention belongs to the field of light quantum technology, and in particular relates to the preparation of quantum correlated photon pairs, and the preparation of entangled photons and single photons based on quantum correlated photon pairs. Background technique [0002] Quantum correlated photon pair (referred to as correlated photon pair) refers to a pair of photons with quantum correlation characteristics in the time-energy degree of freedom, and is one of the key resources in quantum information technology. Based on correlated photon pairs, not only can entangled photons in different dimensions such as time, frequency, and polarization be prepared through specific phase matching or post-selection techniques, but also the detection signal of one photon in a photon pair can be used to announce the existence of another photon. Prepare announced single photons to meet the needs of quantum information technology. [0003] Spontaneous parametric pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35
CPCG02F1/353G02F1/3536
Inventor 李小英崔亮
Owner TIANJIN UNIV
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