System and method for generating spectral de-entanglement photon pairs

Abstract

The invention provides a system and a method for generating spectral de-entanglement photon pairs. The first micro-ring resonant cavity and the first waveguide are in a critical coupling state; the radius of the first micro-ring resonant cavity is an integral multiple of the radius of the second micro-ring resonant cavity; the first micro-ring resonant cavity is used for resonance of pump light, and the resonance of the pump light automatically generates photon pairs at the wavelengths of signal light and idler frequency light under the effect of spontaneous four-wave mixing; the generated signal photons and idler frequency photons are generated at the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity; the wavelength of the pump light is the wavelength corresponding to the resonance peak of coupling of the first micro-ring resonant cavity and the second micro-ring resonant cavity. When pulse pumping is used, when the width of a resonance peak of pumping light is larger than that of resonance peaks of signal light and idler frequency light, entanglement correlation of generated photon pairs can be removed in frequency, and pure-state single photons are generated. According to the quantum light source, the resonance peak of the quantum light source based on the micro-ring resonant cavity is regulated and controlled, so that the effect of generating spectrum de-entanglement photon pair emission is achieved.

Description

technical field [0001] The invention belongs to the field of quantum optics, and more particularly, relates to a system and method for generating spectrally disentangled photon pairs. Background technique [0002] Quantum entanglement is a property derived from non-classical quantum mechanics. It plays a crucial role in the application of many quantum technologies, such as quantum computing and quantum information technology. However, in optical quantum technology and photon pair generation technology based on nonlinear quantum process, there are some properties of entanglement that are not needed in practical applications and must be avoided, such as spontaneous four-wave mixing process and spontaneous parametric down-conversion process. Spectral frequency entanglement of photons in . The entanglement in frequency can lead to the generation of photons that are not pure, that is, there is a non-classical correlation, which leads to an increased failure rate of some subseque...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a system and method for generating spectrally unentangled photon pairs, aiming to solve the problem of spectral entanglement between photon pairs in announced single-photon sources based on nonlinear processes. The problem of quantum interference visibility drop between multiple light sources

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