146 companies
Compute
Hardware, software, and cloud platforms across all qubit modalities.
Quantum HardwareQuantum SoftwareCloud Platforms
Browse Compute Quantum Security and Technology Companies
Quantum Security and Technology Companies
832+ organisations across the international quantum ecosystem, independently researched and organised into 8 industry sectors.
832+ companies
47+ countries
31 categories
8 domains
Browse by sector
69 companies
Communications
QKD systems, QRNG, and quantum networking infrastructure.
QKDQRNGQuantum Networks
Browse Communications 192 companies
Security
PQC, cryptographic migration, hardware security, and AI cybersecurity.
PQCCryptographic DiscoveryHardware SecurityIdentity & PKIAI Threat Detection+10 more
Browse Security 15 companies
Sensing
Quantum sensors, atomic clocks, inertial navigation, and quantum imaging.
Quantum SensorsNavigationAtomic Clocks
Browse Sensing 92 companies
Supply Chain
Components, materials, instruments, and fabrication services for quantum hardware.
CryogenicsRF ElectronicsLasersMaterials+5 more
Browse Supply Chain 73 companies
Governance
Standards bodies, regulatory agencies, and compliance vendors.
ComplianceStandards BodiesRegulatory Agencies
Browse Governance 212 companies
Research
National labs, quantum consortia, and academic spin-outs.
Spin-OutsNational LabsConsortia
Browse Research 33 companies
Advisory
Systems integrators, consultancies, media, legal, and HR firms.
Systems IntegratorsConsultanciesMediaLegalHR & Recruitment
Browse Advisory Early-Stage Quantum Technology
Building quantum-secure technology?
Pre-seed and early-stage quantum technology companies can apply for listing and mentorship support. Join the companies already in the directory and connect with the procurement teams, investors, and researchers who use it.
Apply for MembershipAbout This Directory
Every company in this directory has been researched and verified by the QSECDEF team. We cross-reference primary sources: company websites, official filings, product documentation, and peer-reviewed publications. Where a company lists capabilities, we check for evidence of deployed products or active programmes rather than accepting marketing claims at face value.
Company profiles are assigned to sectors based on their primary technical focus. Some organisations span multiple sectors; where that is the case, the profile appears under the most relevant category and cross-references the others. Tier designations reflect active QSECDEF membership at the time of last verification.
Verified May 2026
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