The company says it is on track to build a new kind of quantum computer based on topological qubits.
Microsoft has been on a quest to synthesize this state, called a Majorana fermion, in the form of quasiparticles. The Majorana was first proposed nearly 90 years ago as a particle that is its own antiparticle, which means two Majoranas will annihilate when they encounter one another. With the right conditions and physical setup, the company has been hoping to get behavior matching that of the Majorana fermion within materials. In the last few years, Microsoft's approach has centered on creating a very thin wire or "nanowire" from indium arsenide, a semiconductor. This material is placed in close proximity to aluminum, which becomes a superconductor close to absolute zero, and can be used to create superconductivity in the nanowire. Ordinarily you're not likely to find any unpaired electrons skittering about in a superconductor—electrons like to pair up. But under the right conditions in the nanowire, it's theoretically possible for an electron to hide itself, with each half hiding at either end of the wire. If these complex entities, called Majorana zero…