Trying to understand quantum physics questions

[bug]

particle once it moves does not have to be local? that's precisely my point. we simply may just not have the toolset to measure it cause its too small, but just because you can't measure it or explain why it is no longer local does not mean you can automatically rule out it was deterministic - unless there is some hard evidence I am not understanding.

I think your understanding is that quantum physics somehow makes things non-deterministic. It does not. Quantum physics is just trying to explain why measurements predicted by the classic physics to be deterministic, are not deterministic in practice.

Going back to your example, quantum physics does not postulate your particle must not be local. It simply accounts that, given an amount of measurements, the particle does not act local.

Another thing quantum physics does really well, is making you feel like you're losing your mind when you start thinking about its implications

 

[ThaiTaffy]

I always like the binary explanation, simple but leaves you completely confused "a qubit is duel layer binary and can be both 0 & 1 at the same time"

 

[bug]

@lynx29 If you really want your head to explode, try answering this: what is observation?

 

[lexluthermiester]

The transmission of data down the fibre optic cable does use quantum effects to keep the data stream secure.

In what way? As far as I know that technology uses particle physics, not quantum physics, to detect data-stream intrusions.

 

[ThrashZone]

Hi,
I just watch Lucy for answers she's really easy on the eye's and ears

 

[qubit]

In what way? As far as I know that technology uses particle physics, not quantum physics, to detect data-stream intrusions.

Check this out. Note that this article is from 2004 so this isn't even new.

Entangled photons secure money transfer

An electronic money transaction has been carried out in at a bank in Austria using entangled photons to create an unbreakable communications code. Although commercial quantum cryptography products already exist, none of these use entangled photons to guarantee secure communications. The link was...

www.newscientist.com

 

[lexluthermiester]

Check this out. Note that this article is from 2004 so this isn't even new.

Entangled photons secure money transfer

An electronic money transaction has been carried out in at a bank in Austria using entangled photons to create an unbreakable communications code. Although commercial quantum cryptography products already exist, none of these use entangled photons to guarantee secure communications. The link was...

www.newscientist.com

That article was so wrong I don't know where to begin. The reporter either misunderstood what he was being told about the process or misquoted whoever they were interviewing, possibly because they couldn't understand it. You can't use photons from a laser shot through a crystal to "split" a photon into two parts without changing the photon into something else entirely. Physics does NOT work that way. Whatever process they used, it was not what was described in that article.

 

[ThaiTaffy]

That article was so wrong I don't know where to begin. The reporter either misunderstood what he was being told about the process or misquoted whoever they were interviewing, possibly because they couldn't understand it. You can't use photons from a laser shot through a crystal to "split" a photon into two parts without changing the photon into something else entirely. Physics does NOT work that way. Whatever process they used, it was not what was described in that article.

Yes the article was written by someone who completely miss understood what they were told entangled photons used in encrypted communications are used in two separate fibre lines, not split in one http://rdo.psu.ac.th/sjstweb/journal/261/08quantum-antangle.pdf that is the theory used.

 

[qubit]

That article was so wrong I don't know where to begin. The reporter either misunderstood what he was being told about the process or misquoted whoever they were interviewing, possibly because they couldn't understand it. You can't use photons from a laser shot through a crystal to "split" a photon into two parts without changing the photon into something else entirely. Physics does NOT work that way. Whatever process they used, it was not what was described in that article.

Are you sure you're right? Anyway, I didn't read it, just got one that was about the right subject to show you. I'd expect NS to write reasonably accurate articles.

Have a Google and you'll see that quantum data transfer is real - it's even been discussed on TPU many times. Wikipedia is likely to have a decent article on this.

 

[ThaiTaffy]

Are you sure you're right? Anyway, I didn't read it, just got one that was about the right subject to show you. I'd expect NS to write reasonably accurate articles.

Have a Google and you'll see that quantum data transfer is real - it's even been discussed on TPU many times. Wikipedia is likely to have a decent article on this.

I posted a published paper on it here http://rdo.psu.ac.th/sjstweb/journal/26-1/08quantum-antangle.pdf it's certainly possible and was done as the article implied but the wording and half the facts were incorrect by the reporter.

 

[qubit]

I posted a published paper on it here http://rdo.psu.ac.th/sjstweb/journal/26 1/08quantum-antangle.pdf it's certainly possible and was done as the article implied but the wording and half the facts were incorrect by the reporter.

Thanks for a quality link. You'd think that NS would employ competent reporters wouldn't you? I've just learned otherwise.

Anyway, this is ultimately for @lexluthermiester

 

[Shrek]

In what way? As far as I know that technology uses particle physics, not quantum physics, to detect data-stream intrusions.

Straight quantum Physics, no quantum field theory needed.

 

[lexluthermiester]

Are you sure you're right?

Yes, I'm sure.

Yes the article was written by someone who completely miss understood what they were told entangled photons used in encrypted communications are used in two separate fibre lines, not split in one http://rdo.psu.ac.th/sjstweb/journal/26 1/08quantum-antangle.pdf that is the theory used.

I posted a published paper on it here http://rdo.psu.ac.th/sjstweb/journal/261/08quantum-antangle.pdf it's certainly possible and was done as the article implied but the wording and half the facts were incorrect by the reporter.

Links give a 404 Not Found error.

Straight quantum Physics, no quantum field theory needed.

Do enlighten me.

 

[ThaiTaffy]

Yes, I'm sure.



Links give a 404 Not Found error.


Do enlighten me.

Sorry the link copied strange should be fixed now

 

[lexluthermiester]

Sorry the link copied strange should be fixed now

Nope, still not working..

 

[ThaiTaffy]

Nope, still not working.

not sure why try this link via Google


https://www.google.com/url?sa=t&sou...cQFnoECCEQAQ&usg=AOvVaw30KhDwE91sorrcX6Xpbk2G

Ahh I see a dash is missing

Nope adding the dash still didn't work but the Google link should work

 

[Shrek]

Do enlighten me.

I'll do the best I can from memory

Catching an eves dropper when setting up a key

• The sender sends polarized photons in either the vertical/horizonal basis or the left/right diagonal basis and the choice of basis is random.
• The receiver picks the basis to measure randomly and notes the results

Now they pick up an insecure line and compare basis and throw away those results where the basis did not match.

• Then they take a selection of results where the basis did match and again compare (the line for this comparison need not be secure)
• If the results now match then the line is secure as the eves dropper would have messed things up and they can now use the results they did not compare as the basis of an exchanged encryption key.

Entanglement is not used in this scheme.

 

[lexluthermiester]

I'll do the best I can from memory

Catching an eves dropper when setting up a key

• The sender sends polarized photons in either the vertical/horizonal basis or the left/right diagonal basis and the choice of basis is random.
• The receiver picks the basis to measure randomly and notes the results

Now they pick up an insecure line and compare basis and throw away those results where the basis did not match.

• Then they take a selection of results where the basis did match and again compare (the line for this comparison need not be secure)
• If the results now match then the line is secure as the eves dropper would have messed things up and they can now use the results they did not compare as the basis of an exchanged encryption key.

Entanglement is not used in this scheme.

Yeah, what you're describing is light/photon stream polarization effect and has nothing to do with Quantum effects. This is the scheme I was thinking they had been using to prevent intrusion to fiber data connections.

 

[Shrek]

It depends on quantum measurement and is known as Quantum Key Distribution

A great place is to look it up is

Quantum Computation and Quantum Information
Nielsen and Chuang

 

[lexluthermiester]

Just saw this and thought everyone might enjoy it;

And that more or less summed it up! Well done Brian Cox!

 

[R-T-B]

I don't think the Earth, Sun and for that matter, the rest of the universe cares, about balance and carbon polution, regarding humans well-being - humans are only a tiny tiny dot, in that equation.....
But ill agree, it is fascinating.

It's impacting the climate for sure (co2). As for the earth caring... it's a rock with some green stuff on it. It has no feelings. If we died it'd not care. But we might.

 

[witkazy]

It's impacting the climate for sure (co2). As for the earth caring... it's a rock with some green stuff on it. It has no feelings. If we died it'd not care. But we might.

Do not forget blue ,oceans and stuff there is a lot of it,too much to ignore it but i'm not sure if it cares.

By the way does anybody find it amusing that father of Big Bang theory was catholic priest? It gets me every time

 

[bug]

Just saw this and thought everyone might enjoy it;

And that more or less summed it up! Well done Brian Cox!

I wonder what it would be like if that was the first physics lesson our kids would get.

 

[Shrek]

Feynman was a very clever chap

 

[lexluthermiester]

I wonder what it would be like if that was the first physics lesson our kids would get.

I think it should be. It would be a good start for anyone.