Method for manipulating two-photon quantum interference curve

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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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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