Phase encoding device based on silicon substrate integrated waveguide

Abstract

The invention discloses a phase encoding device based on a silicon substrate integrated waveguide. A single photon emission source is connected with the input end of a front-end coupler through a silicon waveguide; both a long-arm waveguide unit and a short-arm waveguide unit are connected to the output end of the front-end coupler; one rear-end coupler is connected to each of the output end of the long-arm waveguide unit and the output end of the short-arm waveguide unit; the long-arm waveguide unit comprises a first coupler, a delay waveguide and a second coupler; the first coupler is connected with the output end of the front-end coupler through the silicon waveguide and connected with the second coupler through the delay waveguide; the second coupler is connected with the input end of the rear-end coupler through the silicon waveguide; the silicon waveguide and the delay waveguide are produced on a silicon substrate. Compared with the prior art, the phase encoding device disclosed by the invention has the advantages that a long-arm delay part of an interferometer is realized by adopting a delay waveguide; the delay waveguide has the characteristic of low loss; the problem that an ordinary silicon waveguide has great loss in delay is solved, and the quantum bit generating efficiency of the encoding device is improved to a certain degree.

Description

technical field [0001] The invention relates to the technical field of quantum phase encoding, in particular to a phase encoding device based on a silicon-based integrated waveguide. Background technique [0002] Quantum information technology originated in the 1980s and is mainly divided into two research directions: quantum communication and quantum computing. With the continuous advancement of science and technology, the encryption technology based on classical information has inherent security risks due to the limitations of its underlying basic principles. Quantum secure communication has physical unconditional security because of the basic laws of quantum mechanics. Therefore, Quantum Key Distribution (QKD) is more and more widely used. [0003] The premise of quantum key distribution technology is to prepare qubits. The encoding space used by a qubit is a two-dimensional Hilbert space, and its commonly used encoding methods mainly include polarization encoding and ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a phase encoding device based on a silicon-based integrated waveguide to solve the problem that the long arms of the interferometers used in the phase encoding device in the prior art mostly use ordinary silicon waveguides or optical fibers, and silicon waveguides or optical fiber optics Large loss, resulting in a technical problem that reduces the efficiency of qubits generated by the phase encoding device

Images