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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsMicrosoft announced Majorana 1 on February 19, 2025, calling it the first quantum-processing unit built around a “Topological Core.” The company reported eight topological qubits and described an architecture intended eventually to fit more than one million qubits on a chip. That is a significant research milestone—but it is not a million-qubit, fault-tolerant or commercially available quantum computer.
The central scientific question also remains open: independent physicists have questioned whether the public measurements conclusively demonstrate the topological Majorana states and protected qubit operations Microsoft’s roadmap requires.
The short version: what Microsoft built—and what it did not
| Question | Accurate answer |
|---|---|
| What was announced? | Majorana 1, a research quantum-processing unit announced on February 19, 2025. |
| How many qubits were demonstrated? | Microsoft reported eight topological qubits. |
| Where did “one million qubits” come from? | It is a projected scaling capacity for the architecture, not the number operating in Majorana 1. |
| Can customers buy or use the chip directly? | No. It is a laboratory prototype, not a retail product or generally available processor. |
| Is the topological-qubit claim settled? | No. Some researchers say the public evidence does not yet uniquely establish the required Majorana physics or a complete usable topological qubit. |
Microsoft’s original account is available in its Majorana 1 announcement.
How a topological qubit is supposed to work
Majorana zero modes are emergent quasiparticles
A Majorana zero mode is not a new elementary particle placed inside a chip. It is an emergent excitation expected to appear in a carefully engineered condensed-matter system. Microsoft’s devices combine an indium-arsenide semiconductor with a superconducting aluminum layer, cool the structure close to absolute zero and tune it with magnetic fields.
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In the proposed design, Majorana zero modes form near the ends of topological superconducting nanowires. Information is associated with the wire’s parity—whether the relevant electron count is even or odd—rather than being confined to one microscopic location.
Why “topological” does not mean error-free
Spreading information across a physical system could make it less sensitive to certain local disturbances. That is the intended hardware protection. It is conditional, however: the material must enter the required topological phase, the modes must be controlled and measured correctly, and operations must remain reliable when many devices are connected. Noise, fabrication defects, control errors and readout failures do not disappear simply because a qubit is called topological.
Tetrons and measurement-based control
Microsoft describes groups of nanowire structures called tetrons. The proposed architecture uses parity measurements and digital, measurement-based operations rather than relying only on conventional analog gate pulses. In principle, that could make qubits smaller, faster to control and less expensive to protect with error-correction hardware.
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Why the million-qubit number is easy to misunderstand
Quantum-computing specifications distinguish between physical qubits, which are individual noisy hardware elements, and logical qubits, which are encoded using many physical qubits plus error correction. Useful algorithms generally need reliable logical qubits, not merely a large count of physical devices.
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Majorana 1’s eight reported qubits therefore cannot be described as a million-qubit computer. The million-plus figure is an architectural target: Microsoft believes the layout could eventually accommodate that many devices on one chip. Reaching useful scale would still require uniform fabrication, wiring, cryogenic operation, coupling, high-fidelity measurement, entanglement and demonstrated error correction across the array.
Microsoft argues that intrinsic protection could reduce the physical-to-logical overhead compared with less-protected approaches. That is an engineering hypothesis and a long-term objective, not a demonstrated performance result from the eight-qubit prototype.
What Microsoft said it demonstrated in 2025
- Parity measurements on its nanowire devices.
- Single-shot measurement, meaning a result obtained in one measurement attempt rather than by averaging many repetitions.
- Measurement-based control of the device.
- A tetron-based device architecture intended for larger arrays.
- A path toward experiments involving entanglement, measurement-based braiding transformations and quantum-error detection.
These are intermediate hardware demonstrations. They do not amount to a fault-tolerant quantum computer running useful applications. Microsoft’s announcement presented larger arrays, entanglement and error-detection experiments as subsequent steps.
Why physicists remain skeptical
The dispute is specific: do the observed signatures uniquely show Majorana zero modes in the required topological state, or could more conventional effects produce similar measurements?
Independent coverage has raised several unresolved issues:
- Whether the measurements distinguish Majorana modes from quantum-dot or other non-topological behavior.
- Whether the data demonstrate a complete, controllable topological qubit rather than an important intermediate device result.
- Whether the expected protection survives the operations needed for computation.
- Whether the full evidence has been independently reproduced.
- Whether the claimed reduction in error-correction overhead persists in a large, connected array.
Nature described the approach as highly controversial, while APS Physics noted that the associated paper stopped short of an unqualified claim that a definitive topological qubit had been demonstrated. This does not prove Microsoft’s interpretation wrong; it means the public record does not yet settle the question.
What DARPA involvement means
Microsoft said it had reached the final phase of DARPA’s Underexplored Systems for Utility-Scale Quantum Computing (US2QC) program. That indicates the approach was selected for further evaluation of its hardware, software and application potential. DARPA participation is not a blanket scientific certification and does not establish that Majorana 1 was already fault-tolerant or commercially useful.
What changed with Majorana 2 in 2026
Microsoft announced Majorana 2 on June 2, 2026. Its technical description reports a different material stack: lead replaces aluminum as the superconductor, with an updated semiconductor region involving indium arsenide and indium arsenide antimonide.
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| Reported feature | Microsoft’s claim | How to read it |
|---|---|---|
| Topological gap | More than twice that of the earlier processor | Company-reported device metric |
| Mean qubit lifetime | Above 20 seconds | Company-reported; Majorana 1 was reported at 1–12 milliseconds |
| Best observed lifetimes | Sometimes above one minute | Not a guarantee for every qubit or computation |
| Stability improvement | More than 1,000-fold versus Majorana 1 | Microsoft’s comparison, not an independently settled industry benchmark |
| Operating scale | Microsecond-scale operations and a multi-tetron architecture | Part of the proposed path to larger systems |
| Roadmap | A practical scalable quantum computer targeted for 2029 | Corporate target, not a guaranteed delivery date |
Details appear in Microsoft’s Majorana 2 technical overview and hardware page. Nature reported that scientific skepticism continued after the successor was unveiled; longer parity or coherence lifetimes alone do not prove reliable gates, two-qubit entanglement or low logical error rates.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What evidence would validate the architecture?
- Unique topological signatures: measurements that rule out plausible non-topological explanations.
- Non-Abelian or protected operations: demonstrated operations with the behavior expected from the proposed Majorana system.
- Two-qubit entanglement: not only single-device parity measurements.
- Logical-qubit results: reproducible error rates during computation, including gates and readout.
- Independent replication: confirmation by laboratories outside Microsoft.
- Manufacturable scaling: evidence that uniform devices can be connected and controlled in large arrays.
What could a successful system eventually do?
A future fault-tolerant machine—not Majorana 1 as it exists today—could be used for quantum simulation of molecules and materials, drug and catalyst discovery, fertilizer and battery chemistry, energy-material design, and selected optimization or financial problems. Those are prospective applications. Microsoft has not demonstrated such workloads on Majorana 1.
What this means for investors, developers and curious readers
There is no chip to purchase
Majorana 1 is not offered for direct purchase or local operation. The commercial opportunity is adjacent to the hardware: cloud access, software tools, education and scientific-computing services.
Current ways to experiment
- Azure Quantum provides a cloud platform and access to partner quantum hardware. No current price should be assumed without checking Microsoft’s live pricing pages.
- The Microsoft Quantum ecosystem and Azure Quantum documentation support Q# and other development workflows for students, developers and researchers.
- Microsoft Discovery is an AI-assisted scientific workflow product, not a gateway to Majorana 1; Microsoft describes it at its official site.
Other cloud-accessible approaches include IBM’s superconducting systems, Quantinuum and IonQ trapped-ion systems, Google’s research hardware and Amazon Braket’s multi-provider service. They use different physical-qubit technologies and should not be treated as substitutes for Microsoft’s topological architecture.
Bottom line
Majorana 1 was a serious, ambitious research milestone: Microsoft reported an eight-qubit prototype based on a proposed topological architecture with a path to more than one million physical qubits. It did not deliver a million-qubit or fault-tolerant computer in 2025. The architecture’s promise depends on proving that the devices really host the required topological states, demonstrating protected multi-qubit computation and scaling those results beyond the laboratory. Majorana 2 reports striking company-claimed improvements, but the underlying scientific interpretation remains contested.
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