Quantum Bridge Technologies

Quantum Bridge Technologies is a 2019 spin-out from the University of Toronto’s quantum research group, co-founded by quantum cryptography researcher Hoi-Kwong Lo. The Toronto-based company builds infrastructure to protect data and communications against the emerging threat of adversaries who record encrypted traffic today intending to decrypt it once quantum computers mature — the “harvest now, decrypt later” scenario driving current NIST post-quantum migration mandates.

Its core technology is a symmetric key distribution approach the company calls DSKE, which distributes cryptographic keys across independent network paths so that no single compromised path exposes the key, without requiring specialized quantum hardware at every endpoint the way full quantum key distribution (QKD) does. The company markets this as a more deployable middle ground between conventional post-quantum cryptography software and hardware-heavy QKD networks.

Quantum Bridge raised an $8 million Series A in May 2026 to scale the technology, and has established a proof-of-concept and exclusive distribution relationship in Japan. The company targets government and enterprise customers with long-lived sensitive data, though it has not yet disclosed named production customers beyond the Japan pilot activity.