Diamond layers in photonic circuits

JP2025533631A5Pending Publication Date: 2026-06-22ELEMENT SIX TECH LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
ELEMENT SIX TECH LTD
Filing Date
2023-09-27
Publication Date
2026-06-22

AI Technical Summary

Technical Problem

The challenge lies in the weak single-photon emission from quantum spin defects in diamond materials, which limits their application in quantum information processing, and the difficulty in precisely coupling these defects to photonic integrated circuits due to the high refractive index and chemical inertness of single-crystal diamond, making large-area integration and low-loss interconnections challenging.

Method used

A photonic circuit with a large-area single-crystal diamond layer containing spin defects is developed, featuring alignment structures such as diffraction gratings and waveguide couplers to precisely optically couple the spin defects to waveguides, enabling precise alignment and integration with photonic structures.

Benefits of technology

This approach enhances light collection and facilitates the integration of diamond layers on large substrates, allowing for improved compatibility with standard microfabrication techniques, enabling advanced photonic circuits with low-loss interconnections and supporting quantum computing protocols.

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Abstract

A photonic integrated circuit (PIC) and a single crystal diamond layer disposed on the PIC, the single crystal diamond substrate containing at least one spin defect and having a surface area of ​​at least 250,000 μm 2 The PIC comprises the single crystal diamond layer including at least one alignment structure and at least one corresponding diamond alignment structure, and further comprises at least one photonic structure optically coupled to at least one spin defect.
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