Quantum Physics

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Post by halfwise Tue Apr 11, 2017 5:11 pm

I'm hoping the Europa news coming out on Thursday is more than just a tease.

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Post by Pettytyrant101 Wed Jul 12, 2017 1:01 pm


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Post by halfwise Wed Jul 12, 2017 1:12 pm

Based on the first minute, 20 minutes of that would be great with a drink and perhaps some Norc-weed.

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Post by Pettytyrant101 Tue Jul 18, 2017 11:34 pm

{{Need some smarter heads than mine- quantum entanglement- some scientists have extended the furthest this us been tested before by firing one half of the proton at a specially designed satellite then altering the positive/negative of the other half of the pair down here on earth- and it still works instantaneously- so does this prove that in reality there is in fact no distance between objects? scratch Or that there is some sort of as yet unseen invisible connecting strand between the two regardless of distance by which they communicate the others state? scratch And if so why does the distance the information needs to travel appear to take no time at all to do so? scratch }}}

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Post by David H Wed Jul 19, 2017 2:30 am

Halfy can answer this better I'm sure, but although this is long-distance entanglement experiment is incredibly cool, I don't think there's anything that actually exceeds the speed of light.

The key word..."why does the distance the information needs to travel appear to take no time at all to do so?"
Think of it as a slight-of-hand trick where the physicist makes a particle disappear from one hand and instantly pulls it out of your ear with the other hand.

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Post by halfwise Wed Jul 19, 2017 3:14 am

The rule to be tested (derived decades ago by John Bell, so this is known as "Bell's Theorem") is that either
a. Quantum connections can travel faster than light
b. There are hidden variables that can explain the quantum connections
This will take some explanation.

Bell explained the hidden variables by reference to a certain Professor Bertelmann, who was famous for always wearing mismatched socks.  If you raised one pants leg and exposed a blue sock, you knew immediately that the other sock would be pink.  This didn't mean that there was a quantum connection between the socks, because one sock was always blue, the other always pink.  No mystery at all in the connection between Bartelmann's socks.

But if an electron and anti-electron annihilate and produce two oppositely moving photons, one will have spin up, the other spin down (yes, photons have spin, the waves are actually more like corkscrews than simple up and down).  But this is where the great quantum mystery comes in: it doesn't matter which way you point the measuring apparatus, you'll always measure full spin.  The photon can't know which direction you'll measure the spin, so it must assume it when measured.  The spin can't have been pre-existing.  

So there are no hidden variables, the influence travels instantaneously.  But you can't transfer information this way, because the experiment has to wait for the photon to get there first.  You know intellectually that when you measure one photon the other has to be doing the opposite, but since you had to chase that photon down anyway, a fat lot of good that information will do you; you may as well have just attached the message to the photon.

I really don't know anything else that demonstrates this particular quantum weirdness other than spin, and the fact that spin picks its direction based on the apparatus is damn hard to wrap one's head around.  There's simply no good way to explain it.  It pops out of the mathematics and doesn't do the least thing to make itself intuitive.  Nothing but a damn nuisance. Mad

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Post by Pettytyrant101 Wed Jul 19, 2017 6:21 am

{{{Ummm ok....right, I think....but Halfy surely its more like pulling up the leg seeing the sock is green, saying 'aha the other is therefore pink', then changing the green sock for a pink one and the other leg changes to a green one instantly- how does it know you changed the first leg's sock at all? Mad }}

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Post by David H Wed Jul 19, 2017 7:09 am

{{{ Shocked Don't fall for it Petty! It's the oldest physicist trick in the book!!While he's got you looking at your socks he's really picking you sporran!!! Suspect No }}}

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Post by halfwise Wed Jul 19, 2017 12:36 pm

Petty: you have to accept that if they are quantum socks, not Bertelmann socks, then the sock doesn't take on a color until you lift the pants leg, then they BOTH take on color at the same time.  It's an instantaneous quantum connection that happens at the point of measurement, and after that point the connection is over and things are back to normal.  If you don't like it, ranting and raving doesn't seem to help.

For example if you look at my hand....no, THIS hand, over here.  Don't look at the other hand!  That's right.  So my hand is moving to your left.  Look - this works better if you turn your whole head to the left, not just your eyes.  No, no, don't look back at me, keep your attention to the left, stop glancing at my other.....oh drat it, never mind.  Rolling Eyes

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Post by Pettytyrant101 Wed Jul 19, 2017 1:37 pm

{{ Hold on- so if you take a pair of socks, and you send the green one to space on a satellite and keep the pink one here- how do you know its the pink one and you have to change it to a green unless you pull up the trouser leg of time and space to see? But if you look your already then too late anyway?!!! Banghead
And why is my sporran lighter!!!!! Halfy!!!! Extremely Crabbit }}}}

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Post by halfwise Wed Jul 19, 2017 2:19 pm

The point is that socks are NOT quantum. But yes, if they happened to be quantum socks and you are wondering whether it changes or not....then as quantum socks you won't know the color until you look. So saying "you send the green one to space" automatically means they are not quantum socks. Once you know, the thing is over. As quantum socks, all you know is they have a 50% chance of being either green or pink. Once you see one is green, the other becomes pink.

And how do we know they aren't already a certain color until you check? Because you have a detector that can only see pink and green, and another than can only see pink and blue, and when you look you either see green or blue (and pink) socks, depending on which detector you use. But you know socks are completely green, blue or pink. Since the socks don't know which detector is coming, they must become green or blue upon observation.

But historically speaking, Bertelmann has blue, not green socks. Somehow in the larger scheme of things that must make a difference.

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Post by David H Wed Jul 19, 2017 11:33 pm

My socks all have black holes Embarassed

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Post by halfwise Thu Jul 20, 2017 4:02 am

That's what keeps your feet stuck to the ground. Nod

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Post by Pettytyrant101 Thu Jul 20, 2017 5:09 am

{{Mine have a 6 metre exclusion zone around them No }}

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Post by David H Thu Jul 20, 2017 6:05 am

That's what keeps your feet stuck to the ground. Nod

True, but they still suck! Suspect

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Post by halfwise Thu Jul 20, 2017 2:54 pm

Pettytyrant101 wrote:{{Mine have a 6 metre exclusion zone around them No }}

Between those and the kilt there's a strong argument for pursuing your love life while naked.

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Post by Pettytyrant101 Thu Jul 20, 2017 8:00 pm

{{That's what I keep telling her! But she insists I wear the whole hazard suit Mad }}}

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Post by Pettytyrant101 Thu Feb 08, 2018 6:31 pm

{{Just wow- so amazing and cool!The tesla car and dummy occupant riding through space on the back of a massive rocket! Humanity at its best and most wonderfully ridiculous- if only we were like this more often! (Also love the Hitchhikers Guide 'Don't Panic' reference on the dashboard Very Happy ) }}


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Post by halfwise Thu Feb 08, 2018 7:02 pm

I have to give it to Elon Musk, he did it right. I also love the video of the two booster rockets touching down in sync (supposed to be 3, but whatever).

Just talked to a guy who knows somebody who tried starting a company with Elon Musk as Chief Technical Officer. Turns out Musk has too much ego to be anything except Chief Executive Officer, so they split up.

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Post by Pettytyrant101 Thu Feb 08, 2018 7:05 pm

{{ In fairness to them on the boosters, they were trying to land the third one onto a pretty small space in the middle of the sea- that's got to be a touch tricky! Overall though so far its providing a very good proof of concept I'd say. }}}

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Post by David H Thu Feb 08, 2018 9:26 pm

reminds me of Slim Pickens in Dr Strangelove

Quantum Physics - Page 34 Giphy

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Post by Forest Shepherd Fri Feb 09, 2018 12:51 am

Shock twist! Elon's clone is inside the suit. But he'll be okay as long as Elon takes care of himself. Quantum physics means that whatever happens to earth!Elon also happens to space!Elon. It's a little lonely, maybe, but his virtual reality helmet should give him some good distractions when he gets bored.

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Post by Pettytyrant101 Tue Jun 19, 2018 2:02 am

{{The power of buckie to unleash inventive thoughts at 3am continues!!!

'A Scottish-based team of scientists has created a new method of accurately dating the past....existing radiocarbon dating techniques are expensive, energy intensive and use huge arrays of equipment. There are currently only four centres in the UK hosting such a facility....The old machine is the size of a couple of buses and creates a 4.5m volt electric field to produce a particle beam travelling at a fifth of the speed of light.
It is impressive - but also out of date. Because beside it stands the new PIMS machine.
It stands for Positive Ion Mass Spectrometry, a technique which has taken fourteen years to develop...
It works with samples of carbon dioxide gas rather than solid carbon. That means there is no longer a need for a high energy particle accelerator.
Instead a strong plasma generates a beam of charged carbon atoms. A gas collision cell switches the charge from positive to negative and "cleans" the beam to produce enough carbon-14 to measure...."It turns out that isobutane camping gas can replace particle accelerators in making measurements," says Prof Freeman.
"Having realised this we have developed a new instrument technology around putting carbon-14 through camping gas. "....
"Because this machine is so much simpler than the conventional technology, it takes it away from the national facilities and the expertise that is required," he says.
"This machine could go into any laboratory, any department, any company in the world and could be run by just about anybody."
It is smaller, faster, cheaper and even more accurate than existing methods.
"You're more likely to win the lottery twice than get an interference signal on this system," Dr Shanks says.
"This allows us to measure one particle in a thousand million million."


Camping gas and plasma instead of a hulking great particle beam accelerator- if thats not a 3am buckie idea I've never heard one! }}}

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Post by halfwise Tue Jun 19, 2018 11:46 am

I can't quite follow the details there, I'm hoping this isn't another Theranos in the making.

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Post by Pettytyrant101 Tue Jun 19, 2018 4:00 pm

{{Heres the full article Halfy}}

https://www.bbc.co.uk/news/uk-scotland-44526368

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