Method for manipulating two-photon quantum interference curve

A quantum interference and two-photon technology, which is applied in the field of quantum optics to achieve good experimental results and easy adjustment.

Active Publication Date: 2019-02-22
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The problem to be solved by the present invention is how to design a simple, feasible, stable and reliable experimental program to realize the manipulation of the two-photon quantum interference curve, and the problems of difficult adjustment and complicated operation

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  • Method for manipulating two-photon quantum interference curve
  • Method for manipulating two-photon quantum interference curve
  • Method for manipulating two-photon quantum interference curve

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Embodiment Construction

[0038] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] A method for manipulating two-photon quantum interference curves, including the preparation of a spontaneous parametric down-conversion light source and the design of a controllable two-photon quantum interference light path.

[0040] The invention uses an I-type parameter down-conversion process, improves the two-photon interference optical path, and adds an interference filter to realize the manipulation of the two-photon interference curve. The light source uses a parametric down-conversion light source, and the parametric light is coupled into a single-mode fiber through a lens and transmitted to the interference light path. In this way, the light source and the interference optical path can be well separated, mutual interference can be avoided, and the overall stability and control flexibility of the optical path can be i...

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Abstract

The invention provides a method for manipulating a two-photon quantum interference curve. The method comprises two main steps of preparation of a parametric light source and improvement of a manipulative two-photon quantum interference light path, wherein the preparation of the parametric light source is achieved through spontaneous parametric down conversion of laser pumping beta-barium metaborate crystals, and parametric light is transmitted into the quantum interference light path by using single mode fiber; the improvement of the two-photon quantum interference light path is achieved through two polarization beam splitters and a half-wave plate, wherein the fast-axis angle of the half-wave plate is 2.5 degrees. In two output ports of the second polarization beam splitter, the manipulation of the two-photon quantum interference curve can be achieved through the placement of two interference filters, the implementation is simple and feasible, the interference filters of different bandwidths can be combined and used, the better interference visibility can be achieved, the introduced counting error can be controlled, and the better experiment effect is obtained. The method for manipulating the two-photon quantum interference curve has the advantages that the method is simple and feasible, and the adjustment is convenient, and an experiment platform is stable and reliable.

Description

technical field [0001] The invention belongs to the field of quantum optics, and mainly relates to a simple method for manipulating two-photon quantum interference curves. Background technique [0002] Quantum interference plays a very important role in quantum information science. It is the basis of quantum manipulation technology and an important tool to realize quantum communication. Multiphoton interference is one of the most common phenomena in quantum interference, and two-photon interference is a special case of multiphoton interference. Two-photon interference mainly includes Hong-Ou-Mandel interference and Franson interference, which can be mainly applied to the verification of Bell inequality, Bell-based measurement, quantum teleportation and quantum logic gate operations. [0003] Hong-Ou-Mandel interference is a representative two-photon interference experiment, which was first realized experimentally by the Mandel group in 1987. In this experiment, parametric ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02F1/39
CPCG02F1/3517G02F1/39G02F1/392
Inventor 王琴孙涛李剑
Owner NANJING UNIV OF POSTS & TELECOMM
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