Chip allowing projection and separation to be performed on arbitrary-polarization-state qubits and manufacturing method thereof

Abstract

The invention provides a chip allowing projection and separation to be performed on arbitrary-polarization-state qubits and a manufacturing method of the chip. The chip comprises a specific-optical-axis birefringent waveguide and a birefringence waveguide directional coupler, wherein the specific-optical-axis birefringent waveguide is provided with an opening in one end face of an optical glass chip, the opening is used for receiving a polarization state to be projected and separated, and the other end of the waveguide is connected with the birefringence waveguide directional coupler. According to the chip and the manufacturing method of the chip, on the basis of the ultrafast laser direct writing type manufacturing technology, the method of laser beam tilted direct writing is adopted, and the chip allowing projection and separation to be performed on arbitrary-polarization-state qubits is composed of a polarization-state conversion element and a polarization-state separation element and is made of transparent hard materials. Moreover, miniaturization and integration of an optical wave plate and polarization beam splitter are achieved, the problems of connection errors, access loss, interface noise and the like in a macroscopic optical path are avoided, system stability and reliability are improved, manufacturing cost is greatly lowered, and manufacturing cycle is greatly shortened.

Description

technical field [0001] The invention relates to a component in the field of quantum optical detection technology and its manufacturing method, specifically a birefringent waveguide-based device with optical wave plate function and polarization beam splitting function, capable of projecting and separating qubits in any polarization state Quantum optical chip and method of manufacturing the same. Background technique [0002] In traditional information technology, information is transmitted in binary form, that is, all information is a long or short string composed of 0 and 1, and each unit of 0 or 1 is called a bit. , and each bit can only be 0 or 1. Like traditional information technology, quantum information technology also uses binary code to transmit information. The smallest unit of coded information is called a qubit (qubit, which is the abbreviation of quantum bit). The difference is that the qubit can be 0 or 1, It can also be a superposition state of these two stat...

AI Technical Summary

Problems solved by technology

In the case of weak light, in order for material molecules to absorb photons and change their physical properties, the photon energy must be higher than the absorption threshold; but in the case of extremely strong light intensity, although the energy of a single photon cannot reach the threshold, but because There are a lot of photons in the light field, and the probability of material molecules encountering two or more photons at the same time is greatly increased, and their total energy reaches or exceeds the absorption threshold, which makes absorption possible

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