Microsoft Azure Quantum

Microsoft Azure Quantum is Microsoft's quantum offering, combining a cloud platform that provides access to third-party quantum hardware and software with the company's own long-running research on topological qubits based on Majorana zero modes. The cloud service and the hardware research are distinct: the platform runs today, while the topological hardware remains a research program.

#The Azure Quantum cloud

Azure Quantum is a cloud service through which developers can run quantum programs on hardware from several partner companies, including trapped-ion and superconducting systems from providers such as IonQ, Quantinuum, and Rigetti. It also offers development tools, simulators, and resource-estimation utilities that let users gauge how many qubits and how much runtime a given algorithm would need on a future fault-tolerant machine. In this respect Microsoft's near-term product is a software and access layer over other companies' processors rather than a Microsoft-built quantum computer.

#Topological-qubit research

Separately, Microsoft has pursued a distinctive hardware bet for many years: the topological qubit. The idea is to store quantum information non-locally in exotic quasiparticles called Majorana zero modes, so that local noise is far less likely to corrupt the encoded state. If realized, such qubits would be intrinsically more robust and could reduce the enormous Quantum error correction overhead that other modalities require. The approach is scientifically ambitious and has been difficult to demonstrate, because confirming the existence and control of Majorana zero modes is experimentally subtle and prone to signals that mimic them.

The field's history includes a notable setback: a prominent 2018 Nature paper from a Microsoft-linked group reporting evidence for Majorana modes was retracted in 2021 after the data were re-examined. This history is part of why later claims in this area draw close scrutiny.

#The Majorana 1 announcement

In February 2025 Microsoft announced a chip it called Majorana 1, describing it as built on a new "topological core" and presenting it as a step toward a scalable topological quantum computer (Microsoft 2025). A companion Nature paper reported a single-shot measurement technique in the underlying hybrid semiconductor-superconductor devices (Aghaee et al. 2025).

The announcement should be stated carefully. The peer-reviewed result was narrower than the broader framing of the press announcement, and parts of the community questioned whether the devices had definitively demonstrated topological qubits as opposed to measurement capability in candidate devices. As of early 2026, Majorana 1 is best described as an early and partly contested milestone in a long research program, not as a working topological quantum computer. Whether the topological approach yields practical qubits remains unproven.

#Relation to cryptography

Microsoft's resource-estimation tools are often used to project how large a fault-tolerant machine would need to be to run Shor's algorithm against RSA or elliptic-curve keys, which ties the platform to the Post-quantum cryptography threat model. Microsoft also contributes to standardized post-quantum algorithms. No Microsoft hardware, topological or otherwise, is close to threatening deployed cryptography as of early 2026.