Is real quantum computing nearly here?

[Mick]

Quantum breakthrough could revolutionise computing.

[warmweer]

Although progress is the ultimate goal, the inherent danger is always misuse of advanced knowledge.
The idea that the probability of the outcome of malignant scenarios could be calculated in a very short time, is frightening considering the current (or should I say "disconcerting") geopolitical situation.

I won't go as far as to say that the end is nigh, but it's certainly nearer now.

[Mick]

I just keep thinking about radio and video over billions of miles or even light years. Imagine the Mars rovers having real-time communications, how would that shape things in the future?

[warmweer]

I just keep thinking about radio and video over billions of miles or even light years. Imagine the Mars rovers having real-time communications, how would that shape things in the future?

Well, the speed of light is still the maximum speed (theoretically) attainable, radio or video signals (or anything else) originating lightyears away, can still reach Earth only after those (light)years.

Einstein's Theory of relativity explains it all (which in no way implies I understand it all )

[Mick]

Yes but:

So-called quantum particles can be in two places at the same time and also strangely connected even though they are millions of miles apart

Light has nothing to do with that. FTL communication is a distinct possibility.

[warmweer]

Yes but:

So-called quantum particles can be in two places at the same time and also strangely connected even though they are millions of miles apart

Light has nothing to do with that. FTL communication is a distinct possibility.

FTL (whether communication, translocation or whatever is a theoretical concept which up to now causes irresolveable conflicts as it implies that the result of an event could be "experienced" a distance away from the event, before it even took place. (I use "experienced" in the broadest sense), and thus could be modified/undone).

It's a great subject for science fiction writers, and pleasurable reading (and it's mind baffling)

[Mick]

I’ve just had theoretical quantum communications described to me. If you have two sympathetic particles (quantum entanglement) millions of miles apart, particle A & particle B, if A blinks so does B instantaneously. That seems a lot like extremely rapid digital communications over vast distances to me.

[[Dimetrodon]]

That seems a lot like extremely rapid digital communications over vast distances to me.

It's also possible we live in a superdeterministic universe, where the properties of both particles are pre-determined. In that case, this cannot result in faster-than-light communication.

Edit: Mistyped word

[Mick]

Agreed but if one changes state so does the other without any visible or measurable TX/RX lag between the two. We know that the interaction between entangled quantum particles is faster than the speed of light.

[[Dimetrodon]]

We know that the interaction between entangled quantum particles is faster than the speed of light.

Quantum states, yes, but...
Based on what I read, it is not enough to send data faster than light: https://www.aliroquantum.com/blog/quant ... end%20data.

Does quantum entanglement violate the speed of light?

No. While quantum entanglement can cause particles to collapse instantaneously over long distances, we can't use that to transport information faster than the speed of light. It turns out entanglement alone is not enough to send data. For example, quantum teleportation uses entanglement to transfer quantum states across long distances. However, teleportation requires sending a classical bit in addition to the entangled qubits. So, while the entanglement operates instantaneously, the information transfer is limited by the speed of the classical information, which travels at the speed of light.

[Mick]

Yes, I’ve read most of that stuff but the Big Bang expanded faster than the speed of light so that rule is there to be broken and I have every faith one day it will.

[warmweer]

Yes, I’ve read most of that stuff but the Big Bang expanded faster than the speed of light so that rule is there to be broken and I have every faith one day it will.

We're starting to delve deep into theoretical concepts.

The actual "law" is that matter cannot travel faster than light, but space is not matter. The Big Bang concept explains it as space being rearranged and that the matter associated with/assigned to that space just gets the new "coordinates".

Event horizon, wormholes, black holes, the concept of infinity (infinity +1 is still infinity), divisions by zero ... subjects not suited for early morning discussions (early is also one of those relative concepts, in my book anything before 12 AM is early)

[Mick]

but space is not matter

Then there’s dark energy to mess that one up, apparently it occupies 68% with dark matter occupying another 27% of the universe.

But we digress.

[warmweer]

But we digress.

Yeah, and at these speeds it's difficult to follow

[Lumpy Burgertushie]

does any of this mean that I can put a quantum computer in my electric scooter and go a lot faster?