Method for transmitting orbital angular momentum in waveguide of photonic integrated chip

Abstract

The invention provides a method for transmitting orbital angular momentum in a waveguide of a photonic integrated chip. Through a femtosecond laser direct-writing technology, the annular waveguide used for transmitting a multi-order orbital angular momentum mode is machined in transparent borosilicate glass through multiple scanning. The chip prepared through the method can simultaneously and stably transmit the +1 order, the -1 order, the superposition state of the +1 order and the -1 order, and the 0 order, the coupling efficiency is up to 60%, and meanwhile, the fidelity reaches 80% or above; and in addition, the quantum state space is greatly increased through the high dimensionality of the orbital angular momentum and manipulation of the superposition state, and thus the quantum computing ability can be greatly improved potentially through the modes of on-chip manipulation hyper-entanglement and the like.

Description

technical field [0001] The invention relates to a technology for transmitting orbital angular momentum in a photonic integrated chip, in particular to a method for transmitting orbital angular momentum in a waveguide of a photonic integrated chip. Background technique [0002] Orbital angular momentum provides an additional new degree of freedom for classical information and quantum information, and its inherent infinite dimensional characteristics make it used to increase the information capacity of classical information, generate high-dimensional quantum states, and quantum computing in high-dimensional Hilbert spaces . Due to the large-scale application of orbital angular momentum in the fields of classical information and quantum information, it is necessary to develop integrated devices and equipment to integrate the generation, transmission, and manipulation of orbital angular momentum, so as to avoid its connection errors in the macroscopic optical path, Problems suc...

AI Technical Summary

Problems solved by technology

At present, researchers use microring resonators (Integrated compact optical vortex beam emitters), controllable phase arrays (Integrated compact optical vortex beam emitters momentum with silicon photonic circuits), etc., to realize the radiation of orbital angular momentum from the surface of the integrated device to the free space, however, the transfer of orbital angular momentum inside the integrated chip as well as its manipulation and processing have yet to be resolved

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