[anon_tor_12345]

they do and you can get time on one (5 qubits) right now

https://quantum-computing.ibm.com/composer/files/new

if you don't think these are computers then you just don't know what a computer really is

https://en.wikipedia.org/wiki/Circuit_(computer_science)

they're not useful at all but they're still real actual unadulterated computers.

[xondono]

By this logic a 74LS138 is a “digital computer”.

It’s limited because it has only 3 bits, but if you play with the input bits, the output bits change!

[anon_tor_12345]

you're trying to say because a decoder maps n -> 2^n that it's comparable to a QC. lol. my friend you clearly don't understand interference and entanglement.

btw the circuits in quantum circuits clearly aren't just combinational since they evolve in time.

[xondono]

No I’m not, all I’m saying is that by OPs logic, I can claim to have a computer with only a part of it.

“It’s not very useful but it can make computations” is a very low bar to pass, and very basic discrete (classical) logic can clear that without problems.

[anon_tor_12345]

you do realize that ENIAC, i.e. the computer that arguably helped the US win ww2, only had about 15 bits right?

[Hedgemaster]

pls note a difference between a 'logical qubit' and a 'physical qubit'.. currently they don't have even 1 logical qubit, and for quantum computer to be of any use it should have >10k logical qubits...

[anon_tor_12345]

>currently they don't have even 1 logical qubit

wut? different QEC produce differently sized logical qubits and there are absolutely machines with enough physical qubits to amount to a logical qubit:

https://www.ncbi.nlm.nih.gov/books/NBK538709/#:~:text=In%20S....

and realized QEC is definitely not far off

https://www.nature.com/articles/ncomms7979

>for quantum computer to be of any use it should have >10k logical qubits

i'm aware and yet it's false to claim that these things don't compute. for the time being they're noisy computers but they're still computers.