Quantum Bridge Technologies: Building hardware for the future quantum internet

Quantum Bridge Technologies is building the entirely new hardware required for a global quantum internet, specifically focusing on all-photonic quantum repeaters designed to bypass the need for quantum memories.

What Quantum Bridge Technologies does

Quantum Bridge Technologies develops specialised hardware for a global quantum internet. Their core work centres on all-photonic quantum repeaters, built to facilitate long-distance quantum communication. These repeaters use quantum-dot based technology, a deliberate engineering choice to operate without quantum memories. This design aims for better performance, speed, and scalability in quantum communication networks. The company’s technology is built upon its patented Distributed Symmetric Key Establishment (DSKE) protocol, which underpins information-theoretic security for quantum communication. The leadership team includes CEO Mattia Montagna, CSO Hoi-Kwong Lo, and CTO Mark Michael. According to research, Hoi-Kwong Lo is a co-inventor of the all-photonic quantum repeater and is among the top five most productive authors in quantum cryptography. This provides substantial scientific depth to the company’s technical direction.

Why it matters

Quantum repeaters are fundamental to scaling quantum communication beyond short distances. Current quantum key distribution (QKD) systems are limited by fibre loss, typically to tens or hundreds of kilometres. Quantum Bridge Technologies’ all-photonic repeater approach directly addresses this. It aims to extend entanglement distribution across significant geographical spans. This is a critical step towards a functional quantum internet infrastructure, where secure, information-theoretically unhackable communication channels could become a reality. While some quantum technologies integrate into existing classical fibre, Quantum Bridge Technologies pursues an entirely new hardware layer. This signals a commitment to foundational, purpose-built quantum infrastructure, moving beyond purely hybrid approaches. It sets a distinct path for network security and data transmission.

What it takes to build

Building hardware like all-photonic quantum repeaters demands a rare combination of expertise. It requires deep knowledge in quantum optics, photonics engineering, materials science (especially for quantum-dot fabrication), and advanced electrical engineering. Professionals need experience designing and fabricating complex optical circuits, often at the chip level. This must come alongside a nuanced understanding of quantum information theory and quantum error correction. The scarcity lies in individuals who can bridge theoretical quantum physics with practical, scalable hardware implementation. These roles typically demand PhD-level qualifications and several years of post-doctoral or industry experience in highly specialised labs.

The QP read

Quantum Bridge Technologies signals a deeper commitment to bespoke quantum hardware for networking. Many firms focus on post-quantum cryptography or integrating QKD into existing fibre. QBT‘s choice to develop repeaters without quantum memories, using quantum dots, is a bet on a fundamentally different, and potentially faster, path to a global quantum internet. This approach demands a specific, hard-to-find talent pool — engineers who can move from theoretical quantum physics to fabricating complex photonic circuits. Success here means proving that dedicated quantum infrastructure, built from the ground up, can outcompete hybrid or software-only approaches. It’s a long game, but the prize is truly secure, global communication.

Frequently asked questions

What is an all-photonic quantum repeater?

An all-photonic quantum repeater is a device designed to extend the range of quantum communication. Unlike some designs, it processes quantum information using photons without storing it in quantum memories, aiming for higher speed and efficiency.

Why is operating without quantum memories significant?

Quantum memories are complex and difficult to build, especially for scalable, high-speed applications. By bypassing them, Quantum Bridge Technologies aims to simplify repeater design, potentially achieving faster entanglement distribution and network scalability.

What is the Distributed Symmetric Key Establishment (DSKE) protocol?

DSKE is a patented protocol developed by Quantum Bridge Technologies. It provides information-theoretic security for quantum communication, meaning its security relies on the laws of physics, making it theoretically impervious to computational attacks.