Just one error-prone qubit is far from a useful quantum computer, contrary to hypes.

QuEra-Harvard just prepared only one impractical error-prone qubit of neutral atoms with No computation.

(Fig.1) Overhyped fake news media treats just one useless qubit without error correction as "quantum computer's breakthrough !"

QuEra-Harvard just prepared only one useless error-prone qubit (= one qubit can take only 0 or 1 ), still Not a quantum computer.

The 1st, 10th-last, last paragraphs of this overhyped news (7/17/2025) say
"Scientists demonstrate a process called "magic state distillation" in logical qubits for the first time, meaning we can now build quantum computers that are both error-free and more powerful than supercomputers" ← fake news

"Logical qubits (= one logical qubit can take only 0 or 1 value ) are collections of entangled physical qubits that share the same information and are based on the principle of redundancy. If one or more physical qubits in a logical qubit fail, the calculation isn't disrupted because the information exists elsewhere"

"And to make one computer truly useful, other than making them larger, you want them to be able to run programs that cannot be simulated on classical computers" ← Not saying "this research's quantum computer actually outperformed classical computers"

This news-lower-"work remains" on the same research says
"the physical error rates in the processor still pose challenges" ← this QuEra's qubits were still error-prone, useless.

"Because postselection involves this discarding of faulty outcomes, the process reduces the efficiency and scalability of quantum computations by limiting the usable results."

QuEra used only 85 atomic qubits divided into 5 logical qubits (= just 5 bitstring, still Not a computer ).

↑ This research paper ↓

p.2-Figure 1c says "Averaged atom images from the d = 5 distillation experiment, showing 85 physical qubits encoded into 5 logical qubits with 17 physical qubits each"

↑ So this research used just 85 unstable neutral atomic qubits (= still Not a computer ) divided into just 5 logical qubits (= just 5 bitstring = 000000 ), and only one logical qubit (= 0 or 1 ) was left by artificial postselection (= Figure 1b-(iv) )

99% of results were discarded by postselection due to errors, completely useless.

↑ This research paper ↓

p.4-Figure 3d says "Factory acceptance rate of distillation syndromes after perfect stabilizer postselection"

p.5-Figure 4c shows magic state fidelity was 0.92 (= error rate 8%, impractical ) when accepted fraction was 0.014 (= meaning 98.6% of all results were artificial discarded post-selectively due to errors instead of correcting errors )

↑ So QuEra discarded 98.6% of all results of just one logical qubit postselectively due to erroneous results without error correction, which is far from error-free or a practical quantum computer, contrary to fake news.

Rejecting (= discarding ) erroneous results without correcting those errors is illegitimate, cannot be used for practical calculations.

This-other research paper's p.1-right-last-paragraph says "When an uncorrectable state is detected, our fault-tolerance procedure rejects the trial. This postselection... The acceptance rates in our experiments are at least 50%,"

The This-4th-last paragraph says "What the Harvard team's processor does, rather than correct errors during calculations, is add a post-processing error-detection phase wherein erroneous results are identified and rejected."

↑ So this QuEra-Harvard research just rejected erroneous results (= about 99% of all measured results were discarded due to errors, the remaining accepted rate was only 0.01 ) in just one error-prone (logical) qubit without quantum error correction, which is completely impractical.

↑ A magic qubit state is just some qubit's state mixing 0 and 1 bit states with specific probabilities.

↑ Each qubit is measured to be 0 or 1 state after all.

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