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Method for controlling frequency spectrum characteristics of quantum correlated photon pairs by quantum interference

A technology of quantum correlation and spectral characteristics, which is applied in the field of controlling the spectral characteristics of quantum correlation photon pairs by quantum interference, can solve problems such as low collection efficiency, difficulty in dispersion characteristics, and reduced collection efficiency, and achieve simple preparation processes, flexible wavelength changes, and wavelength Can effect

Inactive Publication Date: 2018-07-10
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, for the photon pairs generated by the former method, the addition of narrow-band filtering will reduce the collection efficiency, and the narrower the filter bandwidth, the lower the collection efficiency; although the transformation-limited photon pairs generated by the latter method can obtain higher brightness, However, the phase matching conditions of the parametric process and the requirements of the photon pair spectral characteristics on the dispersion of the nonlinear medium interact and restrain each other, and there is a shortage of photon pair wavelengths that cannot be flexibly changed; in addition, limited by the processing technology, the theoretically achievable by design Dispersion properties are often difficult to implement in engineering

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  • Method for controlling frequency spectrum characteristics of quantum correlated photon pairs by quantum interference
  • Method for controlling frequency spectrum characteristics of quantum correlated photon pairs by quantum interference
  • Method for controlling frequency spectrum characteristics of quantum correlated photon pairs by quantum interference

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Embodiment 1

[0048] Embodiment 1: Utilize the multi-stage cascade structure based on dispersion-shifted optical fiber and single-mode optical fiber to produce spectrally controllable associated photons. For this embodiment, for example figure 2 As shown, the nonlinear medium in the multi-level cascade structure (number of stages N≥3) is dispersion-shifted fiber, and the length and dispersion of each section of dispersion-shifted fiber are the same, and the length is L U =100m, the zero dispersion wavelength is 1549nm, and the group velocity dispersion slope is 0.075ps / km / (nm) 2 ; The dispersion medium in the multi-level cascade structure is a standard single-mode fiber in the communication band, and the length and dispersion of each single-mode fiber are the same, and the length is L dU =11m, the group velocity dispersion coefficient at 1550nm is 20ps / km / nm. Different segments of optical fiber are welded sequentially. The pulsed pump light used to pump the cascade structure has a standa...

Embodiment 2

[0054] Embodiment 2: Quantum interference between two independent predictive formula pure state single photon sources based on multi-level cascade structure

[0055] Quantum interference between independent single photon sources is the basis of various quantum information technologies. like Figure 4 As shown, the two independent predictive single-photon sources in this embodiment are both based on a three-stage cascaded structure composed of dispersion-shifted optical fibers and single-mode optical fibers, and the structural parameters are the same. In the two predictive single-photon sources, the length and dispersion of each section of dispersion-shifted fiber are the same, the length is 100m, the zero dispersion wavelength is 1549nm, and the group velocity dispersion slope is 0.075ps / km / (nm) 2 ; and the length and dispersion of each single-mode optical fiber are the same, the length is 11m, and the group velocity dispersion coefficient at 1550nm is 20ps / km / nm. Different ...

Embodiment 3

[0057] Embodiment 3: Polarization-entangled photon pair preparation based on multi-level cascade structure

[0058] like Figure 5 As shown, this embodiment adopts a three-stage cascade structure of bidirectional pumping to generate polarization-entangled photon pairs. Figure 5 The cascade structure parameters, pump parameters, multi-channel filters and Figure 4 The corresponding parameters in Example 2 shown are the same. The pulsed pump light enters the polarization beam splitter with a linear polarization direction of 45 degrees, and is divided into two beams whose polarization direction is parallel to the paper surface and perpendicular to the paper surface. A beam whose polarization direction is parallel to the paper is input into the three-stage cascade structure clockwise, and the signal and idler frequency associated photon pairs with the same polarization direction as the pump light are generated through the four-wave mixing process (with |H> s |H> i ); and a be...

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Abstract

The invention discloses a method for controlling frequency spectrum characteristics of quantum correlated photon pairs by quantum interference. According to the method, nonlinear interaction is regulated by the quantum interference in a multi-stage parametric process; with adoption of a cascade structure of nonlinear media and dispersive media, a phase matching process of the parametric process can be separated from a control process for the frequency spectrum characteristics of the photon pairs, so that frequency spectra of the photon pairs with different wavelengths can be flexibly regulated. The wavelength range of the photon pairs is controlled by controlling dispersion of the nonlinear media; the frequency spectrum characteristics of the photon pairs are controlled by controlling dispersion characteristics, length and interference levels of the dispersive media between the nonlinear media; the phase matching process, meeting the specific wavelength, of the parametric process is separated from the process for controlling the frequency spectrum characteristics of the photon pairs by the dispersion, and the frequency spectra of the photon pairs with different wavelengths can be flexibly regulated. The method has the advantages that the technology is simple, the wavelength of the photon pairs can be changed flexibly, and the disintegrable photon pairs with multi-wavelength frequency spectra can be output simultaneously.

Description

technical field [0001] The invention belongs to the field of quantum information science and technology, and relates to the preparation of quantum-correlated photon pairs, and the preparation of entangled photons and single photons based on quantum-correlated photon pairs, specifically a method for controlling the spectral characteristics of quantum-correlated photon pairs. Background technique [0002] The realization of many quantum information processing technologies depends on the quantum interference between photons of the transformation limit. Spontaneous optical parametric processes in nonlinear media are an effective way to prepare quantum light fields such as quantum correlated photon pairs and predicted single photons. Commonly used spontaneous optical parametric processes include χ (2) Spontaneous parametric down-conversion processes in second-order nonlinear media and χ (3) Spontaneous four-wave mixing processes in third-order nonlinear media. In such processe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35
CPCG02F1/3501
Inventor 李小英崔亮苏杰李嘉敏
Owner TIANJIN UNIV
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