• Palm-sized quantum chip, Majorana 1, uses new material, makes quantum computers more practical.
• Could help solve currently impossible problems, from breaking down microplastics to creating self-healing materials.

A new quantum computer chip small enough to fit in your palm might solve problems that would take today’s most powerful supercomputers thousands of years to crack. Microsoft says its Majorana 1 represents a fundamental shift in how quantum computers could be built and operated.

Unlike traditional quantum computers, which fill entire rooms and require complex cooling systems, the new chip points toward a future where quantum computing could become as practical as the processors in our smartphones.

Understanding quantum computing

To grasp why this matters, imagine trying to solve a jigsaw puzzle. While traditional computers try pieces one at a time, quantum computers can try multiple combinations simultaneously. However, existing quantum systems are highly delicate – even the slightest disturbance can cause errors. Microsoft’s approach tackles the challenge differently.

The Majorana 1 uses a new type of material called a topoconductor, which makes the quantum bits (qubits) more stable and less prone to errors. “We took a step back and said, “OK, let’s invent the transistor for the quantum age. What properties does it need to have?” Chetan Nayak, Microsoft technical fellow, said.

The power of topological qubits

The breakthrough lies in Microsoft’s approach to creating qubits. The company hsa developed a material made of indium arsenide and aluminium, built atom by atom. The material creates exotic particles called Majoranas that can better protect quantum information than that of conventional approaches. The chip’s design features H-shaped structures, where each ‘H’ contains four controllable Majoranas, each making up one qubit. The structures can be connected like tiles across the chip, offering a way to scale up to one million qubits.

Real-world applications of Majorana 1

Microsoft suggests that the implications of the development could mean:

• Creating materials that can repair themselves, fixing cracks in bridges or scratches on car doors.
• Developing solutions to break down microplastics polluting our oceans.
• Designing more effective medicines by understanding molecular interactions.
• Finding ways to combat global hunger through improved agricultural processes.
• Calculating and modelling complex chemical reactions that are impossible with today’s computers.

“Any company that makes anything could design it perfectly the first time. It would just give you the answer,” Matthias Troyer, Microsoft technical fellow, said. “The quantum computer teaches [an] AI the language of nature so the AI can tell you the recipe for what you want to make.”

Revolutionary measurement approach

One of Majorana 1’s most significant aspects is its measurement system. The chip can detect the difference between one billion, and a-billion-and-one electrons in a superconducting wire – a level of precision necessary for quantum computation.

Unlike traditional quantum computers, which require constant fine-tuning, Majorana 1’s measurements can be controlled with voltage pulses, similar to flicking a light switch. This simplification could be key to making quantum computing practical.

From laboratory to reality

The US Defense Advanced Research Projects Agency (DARPA) has taken notice, and has included Microsoft in its programme to evaluate quantum computing technologies. Microsoft is now one of two companies invited to the final phase of DARPA’s Underexplored Systems for Utility-Scale Quantum Computing programme. The proposed system system includes:

• The quantum chip with eight topological qubits, designed to scale to one million.
• Control electronics to operate the quantum bits.
• A special refrigerator that keeps the chip colder than outer space.
• Software that allows the quantum computer to work with traditional computers.

Industry collaboration

Microsoft isn’t working alone in this field. The company has partnered with Quantinuum and Atom Computing to advance quantum computing capabilities and its Azure Quantum platform already offers access to current quantum systems.

What’s next?

While the Majorana 1 represents a significant step forward, Microsoft acknowledges that more engineering work lies ahead. The company says it needs to refine processes and scale the technology before it can reach its full potential. However, with many complex scientific challenges now overcome and peer-reviewed validation published in Nature, the path to practical quantum computing appears more evident.

“From the start, we wanted to make a quantum computer for commercial impact, not just thought leadership,” Troyer said. “We knew we needed a new qubit. We knew we had to scale.”

The development suggests that practical quantum computing – long considered a concept from a far-future – might arrive sooner than expected. When it does, it could transform how we solve some of society’s most challenging problems, from climate change to medical research, the company says.