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Quantum Computing · Quantum Hardware · Technical blog
A qubit is not a smaller transistor. Noise, and the cost of correcting it, is the reason a device count is not a capacity plan.
Kingson Jebaraj · Founder of CloudExchangers · 7 Nov 2026 · Updated 11 Nov 2026 · 2 min read
In brief
A qubit is not a smaller transistor. Noise, and the cost of correcting it, is the reason a device count is not a capacity plan.
Original CloudExchangers explainer. It describes established public practice and labels the desk’s judgment as analysis. It is not a report of a newly announced event.
Quantum Security
The action is an inventory of cryptography and a preference for agility. It is not a bet on a qubit headline.
Kingson Jebaraj·11 Nov 2026·2 min read
Quantum Cryptography
One project replaces public-key algorithms with new classical ones. The other uses quantum physics to share a key. They solve different problems.
A qubit is a physical system prepared so that it can occupy a combination of two states, and so that several qubits can be correlated in ways classical bits are not. Superconducting circuits, trapped ions and neutral atoms are different physical attempts at that job. They are not brands of the same chip. They fail differently, they are wired differently, and a number of qubits in one modality is not comparable to a number in another without a great deal of context this paragraph will not invent.
The shared problem is noise. The state does not stay where you put it. Gates are imperfect. Measurement is imperfect. A computation that looks right on a slide can be a sample from an error.
Error correction encodes one logical qubit in many physical ones so that some errors can be detected and repaired. It is overhead, not a footnote. A device with more physical qubits is not automatically closer to a useful logical qubit. It might be, if the error rates and the connectivity support the code. Those are the figures a hardware paper has to earn. A press count of devices does not.
John Preskill’s widely cited discussion of the “noisy intermediate-scale” era is the right mood for readers: there are devices that are too big to simulate trivially and too noisy for the fault-tolerant algorithms in the textbooks. The desk will not pretend that era has a closing date.
Read hardware claims in three columns. Physical qubits. Error rates, with the measurement method. What logical operation, if any, was shown. If the third column is empty, you are looking at a component, not a computer you can schedule work on.
Hardware progress is often bundled, in headlines, with the threat to today’s public-key cryptography. Those are related and not the same project. NIST’s post-quantum cryptography effort is about classical algorithms believed to resist a future large quantum computer. It does not depend on you owning a quantum device. See the cryptography piece on this desk before you treat a qubit announcement as a migration plan.
It will not quote a vendor’s latest qubit record. Records move, and repeating them without the paper is how this beat becomes advertising.
Kingson Jebaraj·9 Nov 2026·2 min read
Quantum Algorithms
Shor’s algorithm and Grover’s algorithm are the two results worth understanding before you listen to a broader claim. They do not do the same kind of work.
Kingson Jebaraj·6 Nov 2026·2 min read