--- title: "Quantum Technology Breakthrough Achieved with Hybrid Photonic Platform" url: https://newscentral.site/quantum-technology-breakthrough-achieved-with-hybrid-photonic-platform/ language: en publisher: "News Central Site" section: "Science" published: 2026-10-18T13:00:05.000Z updated: 2026-10-18T21:04:39.643Z id: e22235c0-8288-40dc-a498-ca57114e00b9 source: "Phys.org https://phys.org/news/2026-10-hybrid-diamond-chip-interactions-quantum.html" attribution: "Link to https://newscentral.site/quantum-technology-breakthrough-achieved-with-hybrid-photonic-platform/ and name News Central Site when you quote or summarize this story." --- # Quantum Technology Breakthrough Achieved with Hybrid Photonic Platform A major breakthrough in quantum technology has been achieved with the development of a hybrid photonic platform that integrates quantum emitters with photonic devices. This innovative chip-based system combines gallium phosphide (GaP) with a diamond substrate to provide reliable control over interactions between photons and quantum information carriers. The ability to connect quantum devices over long distances is crucial for scaling up quantum technology to create communication networks. However, existing fiber-optic networks face significant challenges in converting information stored in qubits into optical photons that can travel through the network. Researchers have now demonstrated a way to overcome this challenge using a hybrid-integrated GaP-on-diamond nanophotonic platform. This platform enables reliably controlled interactions between photons and silicon-vacancy (SiV) centers in diamond, which are a type of quantum memory or qubit. The use of gallium phosphide in the platform also offers strong nonlinear properties that facilitate optical frequency conversion, switching, and modulation, all essential functions for networking applications. This breakthrough has significant implications for the development of practical quantum networks. The team's achievement has been described as a major step forward in addressing the challenge of connecting quantum devices over long distances. The hybrid-integrated GaP-on-diamond nanophotonic platform is poised to play a key role in the development of future quantum communication systems. Researchers have made significant progress in developing a hybrid platform that combines gallium phosphide (GaP) and diamond to create high-performance photonic devices. The new platform features a scalable fabrication process that enables the creation of over 600 GaP nanophotonic cavities on a diamond substrate with an impressive yield of 99.5%. According to experts, this technology has the potential to revolutionize quantum communication systems by enabling secure and reliable data transmission over long distances. GaP-on-diamond has been studied for over a decade as a promising platform for scaling up diamond-based quantum bits (qubits), but achieving high cooperativity, a critical requirement for controlling qubits, has proven challenging. The separation of the GaP photonic layer from the SiV centers in the diamond has made it difficult to achieve high cooperativity, with earlier devices using non-standard etching methods that are hard to scale up. The researchers have made significant improvements to their GaP-on-diamond devices, addressing a major challenge in achieving high cooperativity between light and quantum bits. A crucial breakthrough was achieved by redesigning the structure of the device to enhance optical interactions while perfecting the fabrication process. This involved optimizing the stamp transfer process, which is now nearly 100% efficient. The new platform combines the strengths of two materials: unetched diamond provides a pristine host for strong SiV-photon interaction, essential for transferring quantum information, while GaP enables integrated optical components such as switches and modulators. This design improvement has enabled the integration of physical separation between the SiV centers and photonics into the device optimization process. This has significantly enhanced interactions without compromising other aspects of the device. The potential applications of this platform are substantial, with the possibility of connecting multiple SiV qubits on a single chip to integrate switching, modulation, and waveguides alongside SiV qubits. The researchers took their hybrid diamond chip and put it through a series of tests to ensure its performance met expectations. They started by growing a GaP membrane on a carrier substrate and then patterned nanophotonic cavity devices into the membrane using electron-beam lithography. This process allowed them to test the properties of the devices using optical spectroscopy. The testing revealed that the devices had achieved above-unity cooperativity, which is a crucial factor in enabling strong interactions between light and quantum bits. Using a laser, the researchers were able to demonstrate this by detecting the SiV spin state through the light scattered from the device. Each spin state produced a distinct spectral signature, allowing them to observe the qubit switching between states. The devices also showed impressive spin-relaxation times, exceeding 0.4 milliseconds. When combined with the high cooperativity values, these results enabled single-shot readout of the SiV electron spin. This achievement is significant because it paves the way for more complex and sophisticated quantum computing applications. To take their research to the next level, the team plans to connect multiple GaP-on-diamond SiV devices on a single chip. They aim to demonstrate entanglement between these devices, creating a larger quantum register that could be used in advanced quantum computing applications. Additionally, they will work on optimizing the fabrication process to improve cooperativity values and enable more complex photonic chip layouts. The hybrid integration approach used to create the diamond chip could be applied to various other quantum emitter platforms. This might include qubits that are difficult to integrate with traditional all-diamond photonics, which could potentially be combined with gallium phosphide on diamond. Similar approaches could also be adapted for use in silicon carbide and single emitters in 2D materials. This would provide new tools for scaling up quantum technologies. The successful integration of different quantum platforms could lead to significant advancements in the field of quantum computing. --- Source: [Phys.org](https://phys.org/news/2026-10-hybrid-diamond-chip-interactions-quantum.html) Published by News Central Site: https://newscentral.site/quantum-technology-breakthrough-achieved-with-hybrid-photonic-platform/