Quantum light source chip based on optical superlattice and waveguide light path

Abstract

A method for setting up a quantum light source chip based on an optical superlattice waveguide, which adopts the integration of a waveguide optical path, an optical superlattice, and an electro-optical modulator, and the waveguide optical path splits the incoming classical pumping laser beam through a waveguide beam splitter, splitting the beam After the laser light enters the optical superlattice region, the frequency is transferred to obtain entangled photon pairs, and then the entangled photon pairs continue to enter the interferometer for quantum interference; the phase of the interferometer is controlled by the built-in electro-optic modulator on the chip, and obtained through voltage adjustment. Several different quantum states.

Description

technical field [0001] The invention relates to the fields of quantum information technology, optoelectronic technology and nonlinear optics, in particular, a chip-based quantum light source is realized by using integrated optical technology and ideas. Background technique [0002] Entanglement is the core resource in quantum information technologies such as quantum communication and quantum computing. Therefore, how to prepare entangled light sources, especially adjustable, efficient, stable, and portable entangled light sources has always been a research difficulty and hot spot in the field of quantum information. The methods for generating entangled photon pairs historically include: (1) atomic cascade transitions [1]; (2) four-wave mixing processes in atomic systems [2]; (3) silicon-based [3,4] or optical fiber The four-wave mixing process of [5,6]; (4) the optical parametric down-conversion process in second-order nonlinear crystals [7,8]. Among them, the atomic casca...

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Problems solved by technology

[0003] However, whether it is a birefringent crystal, an optical superlattice bulk material or a waveguide structure, a crystal can only produce one kind of entangled light source, and many other optical elements are often needed before and after the nonlinear crystal to realize the pump light and generate The processing and collection of photon pairs, etc., lead to the generation of entangled light sources. The optical path is generally complex, large, not stable, and does not have good function expansion capabilities.

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