Faster broadband possible after UK and South African scientists rewrite rules of light
Key Points
- UEA and Wits scientists have shown light can twist and spin on its own, without mirrors, lenses or engineered materials, by exploiting its natural topology.
- The discovery, published 28 April 2026 in Light: Science & Applications, opens routes to higher capacity broadband, more secure quantum communications and cheaper medical tests.
- Lead researcher Kayn Forbes (UEA) said carefully prepared light develops handedness, or chirality, naturally as it travels through empty space.
- The technique avoids exotic materials and precision lenses, lowering the barrier to mass market optical and quantum technologies.
- The work feeds into the UK's £2.5 billion National Quantum Strategy and broader Full Fibre rollout, where bandwidth and security are central concerns.
A research team at the University of East Anglia and the University of the Witwatersrand has uncovered a hidden property of light that could feed Britain’s £2.5 billion quantum push and squeeze more bandwidth from existing fibre networks.
The study, published at the end of April, overturns decades of optics theory and removes the need for the engineered surfaces, exotic materials, and powerful focusing lenses that today’s advanced light systems depend on.
UEA chemist Kayn Forbes and Wits physicist Isaac Nape showed that carefully prepared light beams develop chirality, the property of behaving like a left or right hand, simply by travelling through empty space. That opens a route to cheaper, simpler kit for everything from high-speed internet to medical diagnostics.
How the breakthrough works
The team showed that light prepared in a balanced state generates spinning regions on its own as it propagates.
MSc student Light Mkhumbuza, who ran the key experiments, found that beams start with no spin and develop spinning regions that separate out as they travel.
Forbes said the work breaks the assumption that interactions between light’s spin and twist are too weak to harness, an idea that has shaped optics for decades.
The mechanism comes from topology, the branch of mathematics that studies properties preserved under stretching and bending.
Nape explained that light carries a hidden topological fingerprint inside its polarisation pattern, and that fingerprint quietly directs how the beam evolves.
By tuning the topology, scientists can choose where and how chirality appears, giving them what Nape called a new control knob for light.
What it means for broadband
Structured light, where engineers set shape, brightness, and direction deliberately, can pack data into multiple twisting and spinning states at once.
Each twist carries information, so a single beam can transmit far more than today’s systems built around standard polarisation.
That matters for UK households as Openreach pushes its Full Fibre rollout towards 30 million premises, with consumer demand for video, gaming, and cloud services pushing peak loads year on year.
The UEA finding suggests future fibre and free space optical networks could squeeze more bandwidth out of the same infrastructure without expensive hardware bolted on top.
Cheaper components mean faster rollout, which translates into better service tiers and lower prices for end users.
Quantum networks and UK security
The UK government has committed £2.5 billion to its National Quantum Strategy over ten years from 2024, with secure quantum communications a central pillar.
Topology offers a way to protect quantum information from noise and interference, the two factors that have kept quantum networks confined to laboratory conditions.
Forbes said the geometric approach could lay the foundation for a new generation of optical technologies, including quantum networks robust enough for everyday use.
For consumers, that points to communications channels resistant to interception, which has implications for online banking, NHS health records, and private messaging.
UK telecoms operators, including BT have already trialled quantum key distribution on commercial fibre routes, and any technique that simplifies the underlying optics accelerates the path to wider deployment.
Cheaper medical tests also on the horizon
Many medicines exist as twin molecules, sometimes called left and right-handed forms, that look almost identical but behave very differently inside the body.
Telling them apart currently demands specialist laboratory equipment, which keeps testing expensive and slow.
The UEA approach uses structured light to distinguish chirality directly, raising the prospect of compact optical sensors that work outside specialist labs.
Forbes said the technique could deliver simpler, more sensitive medical tests, particularly in drug development and disease detection.
For NHS procurement and pharmaceutical R&D in the UK, this points to lower per-test costs and faster turnaround.
The team will now look at how to engineer the effect into practical devices, with the topology approach offering a route that does not depend on rare or fragile materials.
