Old doubts linger, yet new Microsoft quantum chip raises the stakes

1. At a Glance

• Topological quantum computing stores quantum information in exotic states called Majorana zero modes. The aim is qubits that are protected from noise by their physical design, rather than by heavy error correction added on top [1].
• Microsoft's Majorana 1 chip, sold as having the "world's first topological qubits", drew wide scientific scepticism. A follow-up chip (Majorana 2) has now brought the old doubts back [1].
• UPSC relevance: GS-III (Science & Technology, emerging tech); India's National Quantum Mission (NQM); and the ethics of science communication (hype vs. evidence) [1][2].

2. Why in the News

• On 15 October 2026, The Hindu reported that Microsoft's new Majorana 2 chip raises the stakes while doubts about Majorana 1 remain unresolved [1].
• Prof. Sergey Frolov (University of Pittsburgh) said Microsoft's earlier record makes him unwilling to treat the new work as resting on a well-understood foundation [1].

3. Background & Evolution

• February (2025): Microsoft Quantum announced Majorana 1, a processor said to contain the world's first topological qubits, built with a new material it called a "topoconductor" [1].
• Majorana 1 had 8 qubits. Microsoft said future versions would hold one million [1].
• On the same day, Microsoft's team published a paper in Nature. The paper was "considerably more circumspect" than the press release [1].
• What the paper actually showed: devices made of indium arsenide–aluminium, plus a way to measure, in a "single shot", the parity of an electronic state in the wire (whether its number of electrons is odd or even) [1].
• The team called parity measurement a "necessary ingredient" for topological quantum computing. It is not proof that topological qubits exist [1].
• The gap between the paper and the press release led to concerns that Microsoft was trying to claim a commercially lucrative technology before showing it worked [1].
• Majorana 2: pictured in a Microsoft/Reuters handout photo. Microsoft is pressing ahead despite the open questions [1].
• India's parallel track: Budget 2020 announced a ₹8,000 crore National Mission on Quantum Technologies & Applications (NM-QTA) over five years [6]. The Cabinet later approved a smaller, separate NQM in April 2023 [2].

4. Core Static Facts

Item	Fact
Topological qubit (concept)	A qubit encoded in Majorana states, intended to resist noise by design [1]
Microsoft material	"Topoconductor"; devices of InAs–Al [1]
Majorana 1	8 qubits; claimed path to 1 million [1]
Key measurement	Single-shot parity (odd/even electron number) measurement [1]
Journal	Nature [1]
Prominent critic	Sergey Frolov, University of Pittsburgh [1]
India: NQM approval	Union Cabinet, April 2023 [2]
NQM outlay	₹6,003.65 crore, 2023-24 to 2030-31 (8 years) [2][5]
NQM qubit targets	20–50 physical qubits (3 yrs); 50–100 (5 yrs); 50–1,000 (8 yrs) [2][3]
NQM platforms	Hedges across several platforms: superconducting, trapped ion, semiconducting, photonic, neutral atom [4]
Nodal department	Department of Science & Technology (DST) [4][6]
Earlier proposal	NM-QTA, ₹8,000 crore over 5 years (Budget 2020) [6]

5. Multi-Dimensional Analysis

Scientific / Technological

• If topological qubits work, they could greatly reduce the error-correction overhead that limits superconducting and ion-trap machines [1].
• A parity measurement is a necessary step but not a sufficient one. Showing that Majorana modes exist, and that they can be braided to perform operations, is still unproven [1].
• India deliberately backs several qubit platforms because the winning approach is still unclear [4].

Ethical / Governance (science communication)

• The paper was cautious but the press release was expansive. Corporate claims are running ahead of peer-reviewed evidence [1].
• Reproducibility and trust matter: critics say a weak earlier record raises the bar of proof for new claims [1].

Economic

• Being first to a working topological qubit has high commercial value, which creates an incentive to over-claim [1].
• India has a ₹6,003.65 crore public commitment and needs to choose its investments in a field where the leading technology may still change [2][4].

Geopolitical / Strategic

• Quantum computing is a strategic technology. India's NQM targets of up to 1,000 qubits position it in the global race [2][3].
• When private companies dominate frontier hardware, countries become dependent on them. This argues for domestic capability [4].

Administrative

• The NQM reports sanctioned, released and utilised amounts to Parliament, so its spending can be monitored [5].

6. Recent Developments (last 12–18 months)

• 2025: PIB backgrounder "National Quantum Mission: India's Quantum Leap" restated the mission's targets [3].
• December 2025 (approx.): In a reply to a Parliament question, the government confirmed the ₹6,003.65 crore, eight-year outlay [5].
• October 2026: The Hindu reported on Majorana 2 and renewed scepticism, including Frolov's criticism [1].
• Not covered in the available sources: the technical claims made for Majorana 2. The article excerpt is cut off before it describes them [1].

7. Prelims Hooks

• Majorana 1 was announced by Microsoft Quantum and claimed the world's first topological qubits [1].
• Microsoft's new material is called a "topoconductor" [1].
• Majorana 1 had 8 qubits, with a claimed path to 1 million [1].
• Device material: indium arsenide–aluminium [1].
• Parity means whether the number of electrons in a state is odd or even [1].
• The Majorana 1 research was published in Nature [1].
• The NQM was approved by the Union Cabinet in April 2023 [2].
• NQM outlay: ₹6,003.65 crore for 2023-24 to 2030-31 [2].
• NQM qubit targets: 50–1,000 physical qubits in 8 years [2][3].
• The NQM is anchored in the Department of Science & Technology [4][6].
• Budget 2020 first proposed ₹8,000 crore (NM-QTA) for quantum technologies [6].
• The NQM spreads its bets across five qubit platforms, including photonic and neutral atom [4].

8. Why Experts Want More Proof This Time

• This field has had a big Majorana claim withdrawn before
• In 2018, Nature published a paper from the QuTech group in Delft. It reported a signal (a conductance "plateau", meaning a flat step in how easily current flows) at a value that theory links to Majorana zero modes [7].

• In 2021 the paper was retracted, which means officially withdrawn by the journal [8].

• The error was caught only because someone saw the raw data

• Sergey Frolov and Vincent Mourik compared the raw data they were given with the published figures. They found the two did not match [8].
• The authors re-checked their work. Some data had been "corrected" when it should not have been, and one figure axis was labelled wrongly [8].

• After recalibration (re-checking the measuring setup), the plateau moved about 8% away from the value the theory predicts. The central claim did not survive [8].

• Why this matters for Majorana 2

• Frolov was one of the people who caught the 2018 error. He is now the critic quoted on Microsoft [1][8].
• When an earlier result in a field has failed, the next claim needs stronger proof. A press release cannot supply that [1].

9. The Best Case for Microsoft, and Where It Falls Short

• The strongest argument in Microsoft's favour
• The Majorana 1 work was peer-reviewed (checked by independent experts before publication) and published in Nature [1].
• Single-shot parity measurement is a real technical result. The paper calls it a "necessary ingredient" for topological computing [1].

• Hardware labs need to show progress to raise money. If they waited for complete proof, the research might never get funded.

• What is right about this argument

• Parity measurement is real progress. Calling the whole programme fake would be unfair.

• Why it is still not enough

• Peer review approved the cautious paper, not the press release. The "world's first topological qubits" claim came from the press release [1].
• A real topological qubit needs braiding, meaning moving Majorana modes around each other to carry out a calculation. Nobody has shown this yet [1].

• The 2018 paper had also passed peer review, and it was still retracted [7][8]. Peer review is the first check on a result, not the final one.

• A fair conclusion for your answer: Microsoft has shown a step towards a topological qubit. It has not shown the qubit itself.

10. What This Means for India's Quantum Money

• India has wisely kept topological qubits out of its main bets
• The NQM funds five platforms: superconducting, trapped ion, semiconducting, photonic and neutral atom. Topological qubits are not on the list [4].

• If Majorana 2 also fails, India loses nothing directly. If it succeeds, India has no group building that kind of hardware.

• India's own risk is slow spending, not wrong bets

• The full mission is ₹6,003.65 crore over eight years, starting 2023-24 [2].
• A Parliament reply in February 2026 shows about ₹2,330.68 crore sanctioned (approved for projects) and only about ₹699.50 crore released (actually paid out) [9].
• That is roughly 12% of the total paid out, in a mission that is almost three years old [9].

• While hardware ideas keep changing, money that sits unused cannot follow the approach that starts to win.

• DST should link funding to results that others can check

• The 2018 retraction shows that raw data in other experts' hands is what catches errors [8].
• DST could require NQM hubs to share raw data and get key qubit results reproduced by another lab before they announce a milestone.
• This would also keep India's 1,000-qubit target from becoming a headline claim that has not been verified [2].

11. How to Judge the Next Big Quantum Claim

• First, read the paper, not the press release

• In the Majorana 1 case, the Nature paper was "considerably more circumspect" (more careful) than Microsoft's announcement [1].

• Ask what kind of qubit is being counted

• Physical qubits are the actual hardware units. Logical qubits are error-free units built from many physical ones.

• "8 qubits now, 1 million later" is a promise about the future, not a result [1].

• Ask whether another lab has reproduced it

• In 2018, a single lab's result was published and then withdrawn three years later [7][8].

• Ask whether outsiders can see the raw data

• That is exactly how the 2018 errors were found [8].

• Use in GS-IV: this is an example of the duty of honesty in public claims. When a company overstates a result for commercial gain, it uses up the trust that science depends on [1].

12. Anchors for Answers

• Data: NQM ₹6,003.65 crore over 2023-24 to 2030-31; by February 2026 about ₹2,330.68 crore sanctioned and about ₹699.50 crore released [2][9]
• Data: Majorana 1 had 8 qubits; the claimed future target is 1 million [1]
• Comparison: 2018 Nature paper on "Quantized Majorana conductance" (QuTech, Delft), retracted in 2021 after raw-data checks by Frolov and Mourik; the signal moved about 8% after recalibration [7][8]
• Scheme: National Quantum Mission (DST). It funds five qubit platforms and leaves out topological qubits, which spreads India's risk [4]

13. Mains Relevance

• GS-III: Science & Technology, developments and their applications; awareness in IT, computers and nanotechnology; indigenisation of technology.
• GS-IV: Ethics in science and corporate governance (honesty in public claims).
• Question stems: 1. Topological qubits promise fault-tolerant quantum computing but remain scientifically contested. Discuss the promise and the controversy, and the implications for India's National Quantum Mission. (250 words) 2. The gap between peer-reviewed findings and corporate announcements in frontier science erodes public trust. Examine with reference to recent claims in quantum computing. (150 words) 3. Evaluate the multi-platform strategy of India's National Quantum Mission in light of uncertainty over which quantum hardware will dominate. (250 words)

14. Related Topics to Study Next

• National Quantum Mission: India's policy response, with its targets and outlay [2].
• Qubit modalities (superconducting, trapped ion, photonic, neutral atom): needed to compare against the topological approach [4].
• Quantum error correction: the problem topological qubits are meant to solve [1].
• Quantum communication / QKD: another pillar of the NQM, relevant to cybersecurity.
• Post-quantum cryptography: the security consequences of large-scale quantum computers.
• Peer review and reproducibility in science: the ethics angle of the Majorana dispute [1].
• NM-QTA (2020): the predecessor proposal, useful for questions about how the mission evolved [6].

15. NCERT Concepts to Revise

• Technology (Economy): The article is about a new quantum hardware technology and the race to build working qubits.
• Corporate governance (Economy): Critics say Microsoft's press release overclaimed beyond its paper, raising questions about honesty and accountability in company claims.
• Cabinet (Polity): India's National Quantum Mission was approved by the Union Cabinet in April 2023.
• Government budget (Economy): Budget 2020 first announced the ₹8,000 crore quantum mission, a predecessor of the National Quantum Mission.
• Information and communication technology (Economy): Quantum computing and quantum communication are next-generation computing and communication technologies, and the National Quantum Mission covers both.

16. Common Errors / Trap Areas

• NQM outlay: it is ₹6,003.65 crore (2023), not ₹8,000 crore. ₹8,000 crore was the Budget 2020 NM-QTA proposal [2][6].
• "Topoconductor" vs. superconductor: topoconductor is Microsoft's name for its new material class. Do not treat the two as synonyms [1].
• Parity measurement ≠ topological qubit demonstrated: the Nature paper called it only a "necessary ingredient" [1].
• 8 vs. 1 million qubits: 8 is what Majorana 1 had; 1 million is a future aspiration [1].
• Physical vs. logical qubits: NQM targets are stated in physical qubits [2].