posted ago by TurnToGodNow ago by TurnToGodNow +8 / -1

At this point given the lack of results from Quantum Computing it may be mostly bs.

It's all kind of hazy, and the fact the picture is still hazy to the public makes me think this is all bullshit or at the very least a failed endeavor.

First, here is a laundry list of supposed quantum logic gates (about two dozen). https://en.wikipedia.org/wiki/List_of_quantum_logic_gates

Do any of these weird things exist? Companies are not talking about what kinds of logic gates their machines have if any. Secondly, if these can be made, how are they superior to a normal logic gate in my computer?

At this point I don't even know if these things make sense in theory.
For example they allege that in theory you get a benefit from superposition like so

A classical system with 2 bits can only represent one of 4 possible states at a time: 00 01 10 or 11. Let's say we evaluate a function f(x1, x2). To test all possible states with a classical system we run four functions f(00), f(01), f(10), f(11).

In a Quantum Approach we put the 2 qubits into superposition, and apply a quantum gate encoding 'f' in one sequence.

This compares apples to oranges. The classical system produces more information yielding 4 separate results. The quantum example gives an average of results. So a lot of information information is lost.

Secondly how does one even build the logic to apply the function f on let's say 10 qubits all interconnected? Would it require custom hardware for every new complex function you wish to apply? What if we don't want all possible states but just a subsection of states? Based on the theoretical example this cannot be controlled for, you just get an average of all states.

Let's look at this press release from some supposedly amazing machine https://www.livescience.com/technology/computing/worlds-1st-fault-tolerant-quantum-computer-coming-2024-10000-qubit-in-2026

Logical qubits — physical quantum bits, or qubits, connected through quantum entanglement — reduce errors in quantum computers by storing the same data in different places. This diversifies the points of failure when running calculations.

Why would duplicating an atom (essentially) fix errors in your system? If an entangled bit is causing me errors, wouldn't it show the same error whether or not it is entangled (i.e duplicated) elsewhere? If it doesn't show the error elsewhere then that violates what quantum entanglement is supposed to mean.

Even if there is promise to this technology, it seems like too much too soon. A lot of fancy theory but not much to show for it.

Google has recently claimed it's QC did something that would take a super computer forever to do. But what did it actually do? It performed random circuit sampling which is of no practical use. It got random numbers out of a chaotic system. Wow.

Theoretical physicists are prone to get lost in interesting bullshit. Some of them probably have legitimate 160 IQ, but what is the point if it is wasted on fantasy? You can have your theories about all sorts of special kinds of logic gates, but will atoms actually behave the way you theorized? How many assumptions are baked into the cake? Theoreticians don't have to worry about this, but engineers do.

Then once money gets involved, all bets are off.