Quantum Key Distribution
QKD is real, deployed and widely misunderstood. Each essential comes with a lecture from the engineers who build and test it.
Quantum key distribution (QKD) is a way for two parties to agree an encryption key using photons, so that interception can be detected, and it protects the key exchange only.
Why it matters now
May 2026
The UK's NCSC paper on quantum security technologies was last updated on 15 May 2026, and it still does not endorse QKD for any government or military application. If you supply or sit near either, expect the question: why are you buying this?
August 2024
NIST published its first three post-quantum standards, FIPS 203, 204 and 205, on 13 August 2024. Standardised alternatives now exist, so QKD must justify itself against a finished option, not a promise.
January 2025
ESA and the European Commission signed their EuroQCI cooperation agreement on 30 January 2025, with all 27 EU Member States behind the programme. Public money is moving into quantum communication regardless of the sceptics, which means vendor pitches will reach you.
The 9 things
The essentials, in the order we would explain them to a board. Each ends with one lecture from our archive, given by a named practitioner.
QKD uses photons to agree an encryption key between two ends and to reveal anyone who tries to copy it on the way, over a classical channel that must itself be authenticated. The data itself is still encrypted by a conventional cipher. A QKD link therefore secures one step on one route. Before you ask what it costs, list which of your assets actually travel that route.
Quantum Safe Networks: Threats, Best Practices and Use CasesGiampaolo Panariello, CTO of Network Infrastructures About 40 minMembers The NCSC does not endorse QKD for any government or military application. The NSA calls QKD impractical for National Security Systems operational networks. In January 2024, agencies from France, Germany, the Netherlands and Sweden jointly advised prioritising post-quantum cryptography and treating QKD as suited to niche use cases only. Read those papers before your supplier's brochure.
Quantum-Ready, Not Quantum-Only: A Holistic Approach to SecurityDr. Rani Ditcovski, Quantum Researcher About 40 minMembers NIST finalised its first three post-quantum standards on 13 August 2024. They can run as software on networks you already own, while QKD needs specialised hardware such as single-photon sources and detectors. The sensible order is migration first, then QKD for specific high-value links. A vendor who sells QKD as a replacement for post-quantum cryptography has told you something about the rest of the pitch.
Detangling QKD vs PQC: Market Trends, Strategic Tradeoffs, and What Comes NextCierra Choucair, Strategic Content Director About 40 minMembers Photons are lost in fibre and cannot simply be amplified like a conventional signal. Commercial systems typically reach about 100 km, so longer routes chain links through trusted nodes, where keys are handled in the clear inside a secured building. Every node joins your threat model. Quantum memories and satellites are the research answers. Ask any supplier how many trusted nodes your route needs.
Memory-Assisted Quantum Key Distribution (QKD) Networks and Future Applications (Security Defense)Christiana Panayi, Senior Research Fellow in Quantum Communications About 40 minMembers Deployment is no longer a thought experiment. EuroQCI has the backing of all 27 EU Member States, and our archive holds a case study of a country-wide QKD network across the Maltese Islands. Treat such material as evidence about cost, operation and governance, not as an endorsement. Ask who runs it and what it protects.
Case Study Country-wide QKD network throughout the Maltese IslandsAndré Xuereb, Founder and CEO About 40 minMembers QKD's security proofs assume ideal devices. Real lasers, detectors and control software are imperfect, and published attacks on commercial QKD hardware have targeted the devices rather than the physics, for example detector blinding in Lydersen et al., Nature Photonics 4, 686 (2010), and the time-shift attack in Zhao et al., Physical Review A 78, 042333 (2008). Certification of hardware, firmware and operating procedure matters as much as the protocol. Ask for independent security evaluation evidence before you ask for a demo.
Cyber Security for Quantum Key DistributionDr Bob Dirks, Co-Founder About 40 minMembers Quantum security attracts inflated claims: unhackable, future-proof, quantum-secure. Test each one with a plain question. What does this protect, from which attacker, under what assumptions? A credible supplier can answer on one page. Our archive includes a lecture titled, bluntly, Quantum Snake oil.
Quantum Snake oilJose Pizarro, System Engineer About 40 minMembers Defence secrets can need protection for decades, which sharpens the question, yet the 2024 joint paper still treats QKD as a niche option and puts post-quantum migration first. Airbus Defence and Space employs a senior expert on quantum-secured communications, and a project called DISCRETION, coordinated by Deimos Engenharia, targets secure communications for European defence. Neither is an endorsement. Both show where serious engineering effort sits.
Quantum Key Distribution For DefenceJohanna Sepúlveda, Senior Expert Quantum-Secured Communications Technical Domain Manager About 40 minMembers Before any QKD pilot, find out where your cryptography lives: which systems, which algorithms, which keys, which suppliers. Without that, you cannot say which links QKD might protect, or which you could move to post-quantum algorithms with a software change. A cryptographic bill of materials is the starting document.
SBOM, CBOM, Risk and Orchestration for Post Quantum CryptographyJeffrey Duran, Director About 40 minMembers Expert lectures
Every QKD lecture in the QSECDEF archive, from suppliers, operators, research labs and agencies. Members first, then the rest. Pick the one closest to the decision on your desk.
LectureOTP-Grade Irreversibility - Encryption
LectureQuantum-Ready, Not Quantum-Only: A Holistic Approach to Security
LectureQuantum Key Distribution Case Studies
LectureQuantum Safe Networks: Threats, Best Practices and Use Cases
LectureSBOM, CBOM, Risk and Orchestration for Post Quantum Cryptography
LectureQuantum Snake oil
LecturePractical Security Considerations for Quantum Key Distribution in Defence and Communications
LectureCase Study Country-wide QKD network throughout the Maltese Islands
LectureQuantum Key Distribution Practical Security Considerations
LectureDISCRETION showcase in Brussels between Portuguese Embassy and European Commission
LectureQuantum Key Distribution for Defence
LectureQuantum Key Distribution Cyber Security
LectureMemory-Assisted Quantum Key Distribution (QKD) Networks and Future Applications (Security Defense)
LectureQuantum Snake Oil - What Alielments can it cure?
LectureDetangling QKD vs PQC: Market Trends, Strategic Tradeoffs, and What Comes Next
LectureCyber Security for Quantum Key Distribution
LectureCase Study QEYS - Quantum Secure Satellite Communications
LectureAutomated packaging for photonic quantum systems
Lead Scientist for Quantum Communications
the Technology Innovation Institute (TII)
LectureNew Challenges in Quantum Communications: Applied Use Cases in the UAE and Global Ambitions
LecturePractical User Experience with BB84 DV-QKD Devices
LectureComponents for Space and Terrestrial QKD
Senior Expert Quantum-Secured Communications Technical Domain Manager
Airbus Defence and Space
LectureQuantum Key Distribution For Defence
LectureEntanglement-assisted Quantum Key Distribution authentication
LectureOpen-Source Quantum Communication Systems
LecturePractical Security Considerations for Quantum Key Distribution in Defence and Communications
LecturePractical Security Considerations for Quantum Secure Satellite Communications
LectureQuantum Key Distribution: The Telecom Perspective
LectureQKD as a Quantum Machine Learning Task
LecturePractical Security Considerations for Quantum Secure Satellite Communications
LectureCyber Security for Quantum Key Distribution
Institute for Solid State Physics, Technische Universität Berli
Technische Universität Berlin
LectureNext-Gen Quantum Networks Enabled by Deterministic Quantum Light Sources
LecturePractical Security Considerations for Quantum Key Distribution in Defence and Communications
LectureQuantum internet and end-to-end knowledge routing protocols
LectureNew Challenges in Quantum Communications: Applied Use Cases in the UAE and Global Ambitions
LectureQuantum Secured Telecommunication Networks
View profile
LectureQuantum for Military Applications
View profileThe dated sources on this page span 28 months, from January 2024 to May 2026, and the positions in them have not stood still. A one-off course is a snapshot. Weekly learning is a feed, and a feed is what keeps your judgement current while suppliers keep pitching.
Your membership includes the introductory quantum cyber security and quantum resilient blockchain courses, plus the Business Bootcamp. Each ends in a certificate, so your team can study at its own pace and show what it completed.
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More than 170 lectures from practising experts sit in the member library. Topics run from post-quantum cryptography and QKD to sensing, PNT and quantum business. Watch when your diary allows, then return to the ones you need.
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We commit to publishing a new training course every 90 days, so the programme keeps pace with the field. Your membership covers each one as it goes live, with no extra fee for the course.
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Members save 25% on partner training and certifications, including the CPQCPM Post Quantum Cryptography Programme Manager certification. The discount applies at booking, so the saving comes before you pay.
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Become a memberTraining path
The Quantum Cyber Security Foundation is four to five hours across six modules, includes a module on how QKD works and how it differs from post-quantum cryptography, needs no physics background, and ends in a QSECDEF certificate. Module 1 is free to try, and the course is included in membership. It is the quickest route from reading about QKD to questioning a supplier about it. This is the QKD training most readers need before a pilot.
View the courseThe Quantum Business Bootcamp has a session on QKD and quantum networking, and the CPQCPM certification covers the post-quantum migration that essential 3 puts first. Members save 25% on partner certifications.
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QKD is a method of agreeing an encryption key between two parties using the quantum properties of photons. Interception disturbs the photons, so both ends can detect it. It secures the key exchange only. The data itself is still encrypted by a conventional cipher.
No. The NCSC states that quantum-safe cryptography is the best mitigation against the threat from quantum computers, and the 2024 joint paper from French, German, Dutch and Swedish agencies recommends prioritising it. QKD is a possible addition for specific high-value links, not a substitute.
It is in national programmes and trials. EuroQCI has the backing of all 27 EU Member States, and the QSECDEF lecture archive includes a case study of a country-wide QKD network across the Maltese Islands. Agencies such as the NCSC still do not endorse it for government or military use.
No. The QSECDEF Quantum Cyber Security Foundation takes four to five hours, has a QKD module and requires no physics background. The first module is free to try.
We take guidance from the following open frameworks for technical education: EQAVET, the European Quality Assurance Reference Framework for Vocational Education and Training; the European Union Council Recommendation on micro-credentials; the CAST Universal Design for Learning Guidelines; and WCAG 2.2, the web accessibility standard. Educational oversight: QSECDEF Advisory Board. Feedback, errors, omissions and updates: QSECDEF Community.
