One more step towards perfecting quantum computing
Quantum computing opens up previously unimagined opportunities for addressing society's most difficult problems.
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Updated November 2026. This was first published on 14 September 2021. The idea is the same. Any number below is what the original piece said then. It is not a new count.
Key takeaways
- Quantum computing opens up previously unimagined opportunities for addressing society’s most difficult problems.
- Microsoft is dedicated to responsibly bringing these possibilities to life for the benefit of people and the environment.
- From software and apps to control and devices, the Microsoft Quantum team innovates at every stage of the quantum stack.
Quantum computing opens up previously unimagined opportunities for addressing society’s most difficult problems. Microsoft is dedicated to responsibly bringing these possibilities to life for the benefit of people and the environment. From software and apps to control and devices, the Microsoft Quantum team innovates at every stage of the quantum stack.
The qubit in quantum computing: #
A classical computer uses classical bits, which can be either zero or one, to accomplish operations. Whereas quantum computers use quantum bits or qubits. And they can be both zero and one but at the same time. This is called a superposition of states. And it is this that gives the quantum computer its superior computing power. For instance, it’s not possible to make copies of qubits. This is sometimes very useful, such as when you want to keep your information private. But it’s also sometimes very annoying because you can imagine that if you cannot copy a qubit and you cannot use this coping mechanism as a means to overcome errors.
For a better explanation, we can compare a qubit to a coin toss. The condition of the coin is not yet known while flying, and it can be described as a probability. In the case of a fair coin, the state of a flying coin can be described as 50 per cent heads/50 per cent tails. The coin’s state “collapses” on the heads or tails state once it is “observed” (falls on the ground). There are many physical objects that can be used as a qubit. This can be a single photon, a nucleus or an electron.
Types of Qubits: #
Superconducting qubits, These qubits, which are already in use in Google, IBM, and other prototype computers, are created from superconducting electrical circuits.
Trapped Atoms, Lasers can trap atoms in place, allowing them to act as qubits. Ions (charged atoms) that have been trapped can likewise be used as qubits.
Silicon spin qubits, Trapping electrons in silicon chambers to alter a quantum characteristic known as spin is a new technique.
Topological qubits, Majorana fermions, which exist in specific materials and could be used as qubits, are still in the early stages of development.
The Problem with Qubits: #
Even quantum computers make blunders from time to time. Their computing power is vastly superior to that of traditional computers. Because quantum computer circuits are based on qubits. may represent not just zeros or ones but also superpositions of both states using quantum mechanics principles, this is the case. Qubits, despite their enormous potential, are extremely fragile and prone to errors as a result of their interactions with the noise.
A step of Microsoft towards error-corrected quantum computers: #
While quantum computation provides algorithms that outperform traditional ones, they are extremely vulnerable to external disturbances. An extensive study was undertaken to determine how to protect quantum computation from decoherence. Many of the world’s largest technology companies are taking on the challenge. Microsoft has chosen a more challenging task than its rivals.
To generate quantum bits, IBM, Google, as well as a number of academic labs have used rather mature hardware, such as loops of superconducting wire (qubits). Microsoft, on the other hand, hopes to encode its qubits in a quasiparticle, which is a particle-like object that develops from the interactions within matter. Some physicists are unsure about the existence of the quasiparticles Microsoft is working with, It’s also known as non-abelian anyons. But, the company wants to construct topological quantum computers by utilising their topological features. make quantum states exceedingly resistant to outside intervention. topological qubits exist at two distinct places, they are insulated from noise, making our quantum computer more resistant to external influence. This increased stability will enable the quantum computer to scale to complete longer, more complex computations, bringing us closer to the solutions we need.
Microsoft gathered together mathematicians, computer scientists, physicists, and engineers to find possible approaches using theory as a starting point. These specialists worked together, discussed methodologies, and solved innumerable equations to pave the way for the realisation of a topological qubit. Throughout this time, the Microsoft team looked into different materials, different ways to apply control structure, and different approaches to stabilise the topological qubit.
Chemical compounds are now being produced at Microsoft labs using a technique termed “selective area growth” to create the exact surface layer needed for the qubit. This unique approach, chosen for its atomic-level precision, can be regarded as spraying atoms in the exact arrangement required to obtain the desired properties. To ensure that every qubit is appropriately tuned, characterised, and validated, the team continues to assess functional correctness using device simulation.
Qubit architecture is based on nanowires that can enter a topological state under particular conditions (low temperature, magnetic field, material choice). Topological quantum hardware is inherently resistant to local sources of noise. makes it especially interesting as the number of qubits grows. Majorana zero modes (MZMs), which are neither fermions nor bosons, are a fascinating property of topological nanowires. Instead, they follow more unusual quantum exchange laws.
A topological qubit is formed by creating a comb-like structure out of numerous nanowires containing MZMs and linking them in a way that allows them to share multiple MZMs. To build a topological qubit, the first step is to consistently establish the topological phase in these nanowires.
The researchers discovered a topological quantum vortex state in the centre of a semiconductor nanowire surrounded on all sides by a superconducting shell while examining the requirements for the creation of topological superconductivity.
Mathematics, theoretical physics, solid-state physics, materials science, instrumentation and measurement technology, computer science, quantum algorithms, quantum error correction, and software application development have all come together to realise the topological qubit.
Bridging these fields has resulted in ground-breaking strategies for realising topological qubits in all aspects. The topological qubit is still being developed at Microsoft, bringing us closer to scalable quantum computing and solving some of the world’s most difficult challenges.
Questions and answers #
What is the main point? #
Quantum computing opens up previously unimagined opportunities for addressing society’s most difficult problems.
What else did the original piece say? #
Microsoft is dedicated to responsibly bringing these possibilities to life for the benefit of people and the environment.