Quantum Communication in 2026: What’s Happening in Research

Quantum communication uses the quantum properties of light, usually single photons or carefully prepared laser pulses, to move information in ways ordinary signals cannot. Two strands dominate the field. Quantum key distribution (QKD) lets two parties create a shared secret key whose security rests on physics rather than on hard maths problems. Quantum networking goes further: it aims to share entanglement between distant nodes, so that quantum computers, sensors and memories can work together. In 2026 both strands are moving from laboratory demonstrations towards infrastructure, and that shift is creating jobs for physicists and engineers alike. Here is where things stand.

1. QKD is becoming national infrastructure

The biggest change of the last few years is scale. QKD is no longer only a physics experiment; governments are funding it as part of their communication networks.

• Europe. The European Commission is working with all 27 EU Member States and the European Space Agency to build the European Quantum Communication Infrastructure (EuroQCI). It will combine national and cross-border fibre networks with a satellite segment, and it forms part of the EU’s IRIS² secure-connectivity system. In May and June 2026 the Commission ran a public consultation on the next phase of EuroQCI, to be supported from 2027 onwards, and in July 2026 Deutsche Telekom and the AIT Austrian Institute of Technology were chosen to coordinate two support actions, PETRUS2 and HarmoniQCI, on the strategy, standardisation and interoperability of Europe’s national QKD networks.
• India. The National Quantum Mission has an outlay of ₹6,003.65 crore over eight years. One of its four thematic hubs is dedicated to quantum communication and is hosted by IIT Madras together with C-DOT, incorporated as the IITM CDOT Samgnya Technologies Foundation. The mission’s stated goals include satellite-based secure quantum communication between two ground stations 2,000 km apart within India, secure links with other countries, and inter-city QKD over 2,000 km using trusted nodes. On the research side, DRDO and IIT Delhi demonstrated entanglement-based free-space quantum secure communication over more than 1 km on the IIT Delhi campus in June 2025, with a secure key rate of about 240 bits per second and a quantum bit error rate below 7%.
• Singapore. The National Quantum-Safe Network Plus (NQSN+), led by IMDA, aims to bring commercial quantum-safe networks to businesses across the country, starting with operators Singtel and SPTel together with SpeQtral.
• United Kingdom. Heriot-Watt University leads the Integrated Quantum Networks (IQN) hub funded by EPSRC, a consortium of 14 universities with more than 40 non-academic collaborators.

China was an early mover here: its Micius satellite, launched in 2016, carried out pioneering satellite QKD and entanglement-distribution experiments, and a long fibre backbone between Beijing and Shanghai links cities through trusted nodes. Much of today’s work elsewhere is about building comparable capability with open standards and certified equipment.

2. Satellites for long distances

Photons are lost in optical fibre, so fibre QKD without intermediate nodes is limited to a few hundred kilometres. Satellites offer a way round this, because most of a satellite link passes through near-vacuum. Europe’s first dedicated QKD satellite, Eagle-1, is being built by a consortium led by SES, with a platform from SITAEL and a quantum-key payload from Tesat. ESA says it is due to launch in late 2026 or early 2027, followed by three years of in-orbit validation that will feed into EuroQCI. India’s mission targets a 2,000 km satellite link of its own, and Singapore’s space-quantum company SpeQtral is part of NQSN+.

3. Testing and certification: can you trust the box?

QKD’s security proofs assume ideal devices, but real transmitters and detectors have imperfections that attackers can exploit. A large part of current research is therefore about implementation security: finding side channels, designing countermeasures and turning this into test procedures that certification bodies can use. Since January 2024 the Commission’s four-year NOSTRADAMUS project has been setting up a testing and evaluation infrastructure so that QKD products can be validated for certification. You can see this work in current hiring: DTU Physics is looking for a QKD security evaluation specialist to finish CV-QKD test stations and reports for NOSTRADAMUS and AccessQKD. Protocol research is heading the same way: measurement-device-independent QKD (MDI-QKD) removes attacks on the detectors altogether, and it is the focus of a new PhD position at Ghent University – imec.

4. From keys to entanglement: building quantum networks

QKD only needs to send single photons from one point to another. A true quantum network must distribute entanglement across many nodes and store it until it is needed. That requires two components that are still at the research stage:

• Quantum memories, which hold a quantum state long enough to be useful. Groups are testing cold atoms, rare-earth-doped crystals, trapped ions, diamond colour centres and spin defects in silicon. ICFO in Barcelona, for example, is hiring a postdoc to build cold-atom quantum network nodes with memories and Rydberg atoms.
• Quantum repeaters, which link short segments by entanglement swapping so that entanglement can span long distances without trusted nodes.

Testbeds are where these ideas are being tried out on real fibre. In February 2026 Qunnect announced that ABQ-Net in Albuquerque had gone live as what it calls the first open-access, entanglement-based quantum network in the United States. The Chicago Quantum Exchange is hiring a manager for its Midwest Quantum Network Facility, and the University of Tennessee at Chattanooga runs a metro-scale quantum communication testbed. Network equipment makers are joining in too: in April 2026 Cisco announced a research prototype “universal quantum switch” that routes quantum information between systems using different encodings, with an average degradation of 4% or less in its proof-of-concept tests.

5. Networking quantum computers

A second driver for quantum networking has nothing to do with long distances. Quantum computers are hard to scale in one box, so several companies want to link smaller processors with photons, inside a data centre. This needs qubit–photon interfaces that turn a stationary qubit into a flying photon efficiently, and, for superconducting machines, quantum transducers that convert microwave photons into optical ones.

• Nu Quantum in Cambridge is benchmarking remote entanglement between trapped-ion nodes using integrated micro-cavities.
• Welinq in Paris builds links between neutral-atom processors and announced collaborations in 2026 with Pasqal, OVHcloud and NVIDIA’s CUDA-Q platform.
• Photonic in Canada uses T centres in silicon, spin qubits that emit telecom photons, as the basis of a networked architecture.
• QphoX in Delft develops optical interconnects that let superconducting processors be read out and networked over fibre.
• In the Netherlands, QuTech reported in September 2026 on work with Fujitsu towards scaling diamond-spin quantum computers with optical connections.

Theory is following: distributed quantum error correction, which asks how error correction behaves when some operations happen over a noisy network link, is now an active research and hiring area.

6. The other half of “quantum-safe”: post-quantum cryptography

Alongside QKD, the security world is adopting post-quantum cryptography (PQC): new public-key algorithms, run on ordinary computers, that are believed to resist quantum attacks. NIST published its first three PQC standards (FIPS 203, 204 and 205) on 13 August 2024, has FALCON’s standard (FIPS 206) in development, and selected HQC as an additional algorithm on 11 March 2025. Companies are now migrating: AWS, for instance, is hiring applied scientists to formally verify its cryptographic library and help adopt PQC. Most roadmaps treat PQC and QKD as complements rather than rivals; we explain the difference in QKD vs post-quantum cryptography.

What this means if you are a researcher

The field needs people who can take quantum optics out of the lab: experimental physicists who can build sources, memories and detectors, and engineers who can package them, write the control software and run them on real networks. It also needs cryptographers, information theorists and security architects who understand both the physics and the practical threats. Our companion guide, Careers in Quantum Communication, looks at the roles and skills in more detail, and you can browse current openings on our quantum communication jobs page.

Sources

• European Commission, European Quantum Communication Infrastructure (EuroQCI)
• Quantum Flagship, Help shape the next phase of EuroQCI (May 2026)
• Deutsche Telekom, Deutsche Telekom and AIT will coordinate PETRUS2 and HarmoniQCI (July 2026)
• PIB, Parliament question: National Quantum Mission (4 February 2026)
• PIB, DRDO and IIT Delhi demonstrate entanglement-based free-space quantum secure communication (June 2025)
• IMDA, National Quantum-Safe Network Plus
• Heriot-Watt University, Quantum communication and networking
• ESA, Eagle-1
• Qunnect, ABQ-Net goes live in Albuquerque (February 2026)
• Cisco, Cisco introduces Universal Quantum Switch (April 2026)
• QuTech, Diamond spin quantum computing takes a step toward optical scaling (September 2026)
• NIST, PQC standardization process