Millions of qubits required for a dreamlike practical quantum computer are impossible to achieve forever.

Home page
Quantum computers are useless forever

(Fig.1)  "Scalable to million qubits" hypes are rampant to hide today's deadend quantum computers.

A useful quantum computer will need millions of qubits, which are impossible to realize forever.

One quantum bit or a qubit can take only 0 or 1 bit value.

Today's quantum computers are impractical, having only less than a few hundred qubits, which is still Not a computer.

The current world's largest quantum computers like IBM's 1121-qubit condor and china are useless, fake, just publicity-stunt with extremely high error rates (= which detailed information was Not disclosed to hide the inconvenient truth of the current hopeless quantum computers ).

Millions of qubits are said to be needed for a practical quantum computer achieving real quantum advantage or error correction in some useful tasks, which will be impossible forever.

Today's quantum computers with less than 100 error-prone qubits are useless, still Not computers nor real quantum supremacy.

This-4th-paragraph (2024) says
"For a quantum computer to be practical, millions of qubits must be accommodated on a single chip. The most advanced quantum computers today have only a few hundred qubits, meaning they can only perform calculations that are already possible (and often more efficient) on conventional (= classical ) computers.."  ← No quantum advantage

This-8th-last-paragraph (12/10/2024) says
"Willow is still well too small to do useful calculations and that quantum computers will require millions of qubits to solve really important industry problems. Willow has 105 qubits."

This-lower-criticisms and controversies (5/23/2025) say
" Quantum computing remains in its early stages, with significant hurdles in hardware, software, and scalability. One of the biggest issues is decoherence and error rates"

"Scalability is another challenge. While companies like IBM and Google have demonstrated quantum processors with hundreds of qubits (= just 100 error-prone bitstring, still Not a computer ), building large-scale machines with millions of interconnected, error-corrected qubits is still far from reality ( this-middle~lower )."

↑ To hide the current deadend hopeless quantum computers, an incredible amount of overhyped fake news is necessary ↓

Overhyped fake news is needed to hide today's deadend quantum computers.

The 1st, 2nd-last paragraphs of this overhyped news (6/26/2025) say
"Scientists have developed a new type of computer chip that removes a major obstacle to practical quantum computers, making it possible for the first time to place millions of qubits ( this-2nd-paragraph )"  ← lie

"Now that we have shown that milli-kelvin control does not degrade the performance of single- and two-qubit quantum gates"  ← Only one or two qubits (= far less than millions of qubits ) were used after all, contrary to hypes.

Only one single or two useless qubits were used, contray to hypes.

↑ So this research just used only one or two qubits (← this paper's p.2-Fig.1 ~ p.5-Fig.4 used only one or two qubits ), falling far short of the hyped millions of qubits.

↑ This-paper's p.7-methods mentioned only one single qubit, No mention of millions of qubits, contrary to the hype.

The 2nd-paragraph of this hyped news says even the latest (hyped) Rigetti quantum computer (7/16/2025) used only 36-qubits (= far from practical millions of qubits ) with the hopeless high error rate.

Using just 2 ~ 6 impractical qubits is treated like (hyped) million qubits.

The 3rd, 11-12th-paragraphs of this hyped news (1/5/2025) say
"paves the way for millions of qubits on a single chip"  ← hype

"Equal1 representatives said its SiGe 6-qubit array (= actually only two qubits were used in this research, this-p.1abstract, p.3~6, far from millions of qubits, contrary to the hype )"

"two-qubit gate fidelity of 98.4% (= error rate 1.6%, too bad to be practical )"

Even one Majorana qubit has Not been made, but the overhyped fake news says "million qubits are possible !"

↑ This Microsoft's Majorana qubit turned out to be fraud, even one real qubit has Not been realized.

The 10-11th, 13th paragraphs of this site (2/25/2025) says
"this is not a Majorana state,"

"Microsoft team announced its discovery after making just one qubit"

"In the media hype that immediately followed the announcement, some took that million-qubit number as a done deal"

Software companies without making quantum computers are hyping "million qubits are nearing !"

Insider brief of this hyped news (7/16/2025) says
"The project will (= still unrealized ) deliver software tools (= Not quantum computer hardware ) for algorithm design, quantum error correction, and benchmarking to support scalable systems with up to 100,000 physical qubits"

↑ This hyping universal quantum company is just involved in software or classical computer's algorithm called decoder ( this-2nd-paragraph,  this-p.1-abstract-1st-paragraph )

This 3rd-paragraph says
"Among the quantum error correction resources being developed are classical algorithms that identify errors that occur during quantum computation. These classical algorithms are known as decoders"

So "100000-qubit quantum computer !" is overhyped fake news, again.

Silicon spin qubits are hopeless, impossible to scale up to even 10 qubits, so fake news like "million qubit quantum computer !" is needed.

The 1st, 2nd paragraphs of this overhyped news (5/7/2024) say
"the first controllable two-hole spin qubit interaction"

"The breakthrough opens the door to integrating millions of qubits on a single chip"  ← hype, this research used just 2 qubits, Not millions of qubits.

↑ This research ( this or this-p.1-abstract, p.2-Fig.1, p..4-Fig.4 ) used only two qubits, far from the hyped millions of qubits.

Controlling just 5 photon qubits is impractical due to easy photon's loss, so the hopeless photon quantum computers need to spread "(fake) million qubit hype".

The 3rd, 14th, 3rd-last paragraphs of this hyped news (3/3/2025) say
"The company uses so-called photonic quantum computing, which has long been dismissed as impractical (= due to massive loss of photons )."

"The company reports a 0.02% error rate for single-qubit operations and 0.8% for two-qubit creation"  ← Just two error-prone qubits far from practical millions of qubits

"PsiQuantum is fabricating their chips in a commercial semiconductor foundry. This means scaling to millions of qubits will (= just speculation, still unrealized ) be relatively straightforward."

↑ This research ( this-p.1-abstract, p.4-right, p.5-Fig.3 ) used only two photon qubits far from the hyped millions of qubits.

Still only 17 impractical qubits are used.

The 2nd-paragraph of this hyped news (6/17/225) says
"QuantWare.. paving the fastest way to quantum computers with over one million qubits"  ← hype.

The 6th paragraph of this recent news (5/9/2025) says
"QuantWare QPUs... next-generation devices like Contralto-A, a 17-qubit tunable coupler QPU,"  ← still only 17 qubits, far from the hyped million qubits.

Feel free to link to this site.