Quantum/Machines/Microsoft Majorana 2
USA · operational · Other
Microsoft Majorana 2
Microsoft Majorana 2 is a other quantum computer operated by Microsoft in USA. Its physical qubit count has not been published. 7 sourced specs are in the spec sheet. 2 published benchmark or milestone records are listed below, each marked by who measured it.
Also known as Majorana 2, lead-based topological chip
Unveiled on 2 June 2026 with a claimed 1,000x reliability gain and a 2029 target for a scalable machine. A third-party analysis says the data are Z-parity on a single wire and that skeptics (Legg, Frolov) still dispute a topological qubit. No qubit count is stated.
Spec sheet
Technical details as the builder or a paper states them, each with its own source. A blank is a fact we could not source, not a zero. Fidelity and coherence figures are in the benchmark table below.
| Spec | Value | Basis | Note | Source |
|---|---|---|---|---|
| Processor | Majorana 2 lead-based topological chip with prototype tetron unit cell | Vendor reported | Unveiled 2 June 2026; third-party analysis notes the paper shows Z-parity data from a single wire, and skeptics still dispute a topological qubit. | news.microsoft.compostquantum.com |
| Qubit type | Tetron with InAs-Pb hybrid nanowires on a GaSb substrate | Vendor reported | Paper reports a Pb superconductor (gap about 1.3 meV) on a quantum well of 6 nm InAs plus 2 nm InAs0.8Sb0.2. | arxiv.orgpostquantum.com |
| Topology | Tetrons linked through shared quantum dots and tunable junctions, tileable unit cell | Vendor reported | The paper's prototype unit cell is meant to tile into larger arrays such as a 12-qubit array; measurements covered one wire of one tetron. | arxiv.orgpostquantum.com |
| Native gates | Measurement-based: interferometric single-shot parity measurements | Vendor reported | Microsoft's news post claims one microsecond operations; the paper shows parity measurements only and no X-parity measurement or gate demonstration. | arxiv.orgnews.microsoft.com |
| Fabrication | Pb superconductor on epitaxial III-V quantum well grown on GaSb, 'designed atom by atom' | Vendor reported | Fabrication site and foundry are not stated in the sources read. | arxiv.orgnews.microsoft.com |
| Predecessor | Microsoft Majorana 1 | Vendor reported | Microsoft's June 2026 post says Majorana 1 was introduced the year before and used an aluminum superconductor. | news.microsoft.compostquantum.com |
| Roadmap | Scalable quantum computer by 2029, which Microsoft says halves its original timeline | Vendor reported | Stated 2 June 2026; the third-party analysis says the earlier target was 2033. | news.microsoft.compostquantum.com |
Milestone claims
- Third-party analysis: paper shows Z-parity lifetime 22 +/- 1 s on one wire (324 dwell intervals), no X measurement; Legg and Frolov say no topological qubit is shown (2026-06-03, independent) postquantum.com
- Microsoft claims 1,000x reliability gain, mean qubit lifetime about 20 s (up to one minute) and a scalable machine by 2029; topological nature still disputed (2026-06-02, vendor reported) news.microsoft.com
Timeline
- 2026-06-02: Announced
- 2026-06: First operational
- 2026-10-07: Status checked: operational
More from Microsoft
- Microsoft Majorana 1 (operational, 8 qubits)
Comparable other machines
Closest in physical qubit count within the same technology. Counts of different qubit types are not interchangeable across technologies.
| Machine | Operator | Qubits | Status |
|---|---|---|---|
| Microsoft Majorana 1 | Microsoft | 8 | operational |
| Quantum Brilliance Pawsey Accelerator | Pawsey Supercomputing Research Centre | 2 | operational |