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Actually, a 65-qubit quantum computer has been created.

"IBM's current largest quantum computer, revealed this month, contains 65 qubits."

https://www.science.org/content/article/ibm-promises-1000-qu...

I'm not an expert but I think because of the error correction mechanisms the effective number of quibits is smaller than that

No quantum computing platform today has meaningful error correction. What you can get, in some cases, is limited error detection based on the outcome of the question computation, if it's built into your specific algorithm.

There is a big difference between a practical QC and the QC we have now. 65bits isn't practical for any known real problem but ask also how long it takes to boot it, how many cycles it can execute per run and how many runs it can do per day (or week).

These thing are not like your laptop, they are more like particle accelerators.

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