Quantum interference detection chip and test system thereof

Abstract

The invention relates to a quantum interference detection chip, which comprises a coupling grating, an input directional coupler, a grating mode beam splitter, an output directional coupler and a superconducting nanowire single-photon detector. The coupling grating is used for respectively coupling an entangled photon pair generated by off-chip spontaneous parametric down-conversion into two inputports of the on-chip input directional coupler; the input directional coupler is used for converting the input entangled photon pair into a transverse electric fundamental mode photon and a transverse electric second-order mode photon; the grating mode beam splitter has a light splitting characteristic on incident transverse electric fundamental mode light and transverse electric second-order mode light, so that two-photon interference in mode is realized; the output directional coupler is used for transmitting a pair of photons which are simultaneously in a transverse electric fundamental mode or a transverse electric second-order mode and are subjected to mode interference to a certain output port; and the superconducting nanowire single-photon detector absorbs a pair of photons at a low temperature and converts the photons into current signals to be detected by peripheral test equipment. According to the invention, the density of an integrated quantum optical path can be improved.

Description

Technical field[0001]The present invention relates to the field of integrated quantum optical technology, and more particularly to a quantum interference detection chip and a test system thereof.Background technique[0002]The development of integrated quantum optics reduces the quantum optical experiment platform of free space to the chip scale, providing possibilities for demonstrating large-scale quantum calculations. However, the current integrated quantum optical path is mainly a quantum network constructed by a waveguide interferometer of path encoding information, and such a quantum optical path is difficult to easily expand by large scale. In order to achieve scalability in order to simplify quantum calculation architecture or improve quantum communication channel security and anti-noise ability, the operating dimension of the current quantum optical system can be appropriately added, and multiple degrees of freedom, such as light. Waveguide mode, polarization, time, frequency...

AI Technical Summary

Problems solved by technology

However, the current integrated quantum optical circuit is mainly a quantum network composed of waveguide interferometers that encode information in the path, and this quantum optical circuit cannot be easily expanded on a large scale.

Images