@AjohnL, in this household, which contains at least one well-informed Physicist and Mathematician, we believe in Special Relativity. The speed of light (in Vacuo) is constant for all observers.
That's it. Anything else is wild speculation at this point. 🙂
I laughed a lot at the @Mister Audio Quantum Computer video. So many amusing scenes.
Cuts from Interstellar and Ex-Machina Sci-Fi movies.
Who is this supposed to be?
Certainly a striking resemblance to Maths genius David Hilbert:
Now when Michio Kaku steps into a video, I know we are in for a World of Hoey!
My researches indicate that NASA HAS shut down their Quantum Computer, alledgedly under orders from the US Federal Government.
https://eightify.app/summary/scienc...ts-quantum-computer-after-unprecedented-event
My summary is that the US Government fears the breakdown of Banking Encryption schemes, or that we will create an AI Terminator or be swallowed by a Black Hole.
Can't see what the panic is about. I'm not sure I even believe in Quantum Computers. Spooky action at a distance? REALLY! 🤣
That's it. Anything else is wild speculation at this point. 🙂
I laughed a lot at the @Mister Audio Quantum Computer video. So many amusing scenes.
Cuts from Interstellar and Ex-Machina Sci-Fi movies.
Who is this supposed to be?
Certainly a striking resemblance to Maths genius David Hilbert:
Now when Michio Kaku steps into a video, I know we are in for a World of Hoey!
My researches indicate that NASA HAS shut down their Quantum Computer, alledgedly under orders from the US Federal Government.
https://eightify.app/summary/scienc...ts-quantum-computer-after-unprecedented-event
My summary is that the US Government fears the breakdown of Banking Encryption schemes, or that we will create an AI Terminator or be swallowed by a Black Hole.
Can't see what the panic is about. I'm not sure I even believe in Quantum Computers. Spooky action at a distance? REALLY! 🤣
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Same here but I've never asked my wife for an opinion. 😉 Or my son who decided to be an accountant so probably doesn't care.
My only rider would be fine where we can actually check the theory. All ticks. When it comes to black holes and singularities - hang on.
It's not entirely clear what they can do. Spooky action at a distance. I came across a noddy video interview. A specialist was asked about faster than light travel in relationship to this. Answer no - we send the info electronically so the rule isn't broken. Mention of teleportation.
AI. I think I posted a bit of a problem it has. Take well we showed it n million faces. Need I say more? Another. Not sure if this was C4. The presenters face was mapped onto a ballet dancer in a leotard. AI - no. Clever software based on what the film industry tends to do to create avatars. Fact is that this sort of thing can be done in all sorts of areas even voice. Actually I think the program was more concerned about miss information. 😉 It needs to be.
😉 Fact is lots of things make good subjects for discussion and news at a pretty noddy level.
Quantum teleportation is vital to the operation of quantum computers:
"In quantum teleportation, the properties of quantum entanglement are used to send a spin state (qubit) between observers without physically moving the involved particle. The particles themselves are not really teleported, but the state of one particle is destroyed on one side and extracted on the other side, so the information that the state encodes is communicated."
And faster than light travel is ruled out:
"The process is not instantaneous, because information must be communicated classically between observers as part of the process."
(Quotes from "Brilliant Math & Science Wiki")
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The spacetime way of thinking about it is that c is a universal cosmic speed limit, not that it is the speed of light.
Einstein could well have said that the speed of massless particles is a universal constant.
In a universe where mass did not exist everything would whizz around at speed c.
In a universe where particles move around with different, slower speeds there has to be something that is responsible for giving them mass.
That "something" is the Higgs mechanism.
Read more about the universal cosmic speed limit in my reference book which is pictured above.
I had to give up on my Steven Weinberg borrowing. The print was impossibly small!
But I had an interesting read about Turing, good enough to go to Princeton as a mathematician in the late thirties, who invented the computer, the Universal Turing Machine.
He also worked with Godel in proving some problems are impossible to calculate or prove. It is reckoned his efforts shortened WW2 by 2 years and saved millions of lives.
Bletchley Park informed the Russians about Hitler's planned huge tank attack at Kursk, with dates and locations, and thus it all went horribly wrong for the Germans!
Like Oppenheimer, he was treated disgracefully by the establishment. Perhaps because "HE KNEW TOO MUCH!"
My latest library books look promising. Lots of "proper" Physics in both.
Sean Carroll's (delayed) second volume is out in May. I loved Volume 1 which covered General Relativity:
I think if you read lots of books on a topic, pennies start to drop, I never did General Relativity at College, and only rudimentary Quantum Mechanics. 😎
But I had an interesting read about Turing, good enough to go to Princeton as a mathematician in the late thirties, who invented the computer, the Universal Turing Machine.
He also worked with Godel in proving some problems are impossible to calculate or prove. It is reckoned his efforts shortened WW2 by 2 years and saved millions of lives.
Bletchley Park informed the Russians about Hitler's planned huge tank attack at Kursk, with dates and locations, and thus it all went horribly wrong for the Germans!
Like Oppenheimer, he was treated disgracefully by the establishment. Perhaps because "HE KNEW TOO MUCH!"
My latest library books look promising. Lots of "proper" Physics in both.
Sean Carroll's (delayed) second volume is out in May. I loved Volume 1 which covered General Relativity:
I think if you read lots of books on a topic, pennies start to drop, I never did General Relativity at College, and only rudimentary Quantum Mechanics. 😎
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I couldn't quite make out the title of the Mlodinow book, Steve, because of the reflection.
"Stephen Hawking touched the lives of millions. Recalling his nearly two decades as Hawking’s collaborator and friend, Leonard Mlodinow brings this complex man into focus in a unique and deeply personal portrayal."
Read the reviews here: https://leonardmlodinow.com/leonard...n-hawking-a-memoir-of-friendship-and-physics/
"Stephen Hawking touched the lives of millions. Recalling his nearly two decades as Hawking’s collaborator and friend, Leonard Mlodinow brings this complex man into focus in a unique and deeply personal portrayal."
Read the reviews here: https://leonardmlodinow.com/leonard...n-hawking-a-memoir-of-friendship-and-physics/
This just in! From Astronomy.com,
”The strange part of quantum entanglement is that when you measure something about one particle in an entangled pair, you immediately know something about the other particle, even if they are millions of light years apart. This odd connection between the two particles is instantaneous, seemingly breaking a fundamental law of the universe. Albert Einstein famously called the phenomenon “spooky action at a distance.” 😲
Also see details of the Nobel prize for Physics 2022, esp. the development of the experiment that proved quantum mechanics was right.
”The strange part of quantum entanglement is that when you measure something about one particle in an entangled pair, you immediately know something about the other particle, even if they are millions of light years apart. This odd connection between the two particles is instantaneous, seemingly breaking a fundamental law of the universe. Albert Einstein famously called the phenomenon “spooky action at a distance.” 😲
Also see details of the Nobel prize for Physics 2022, esp. the development of the experiment that proved quantum mechanics was right.
Quantum mechanics was just hotting up in the decade during which I attended university.
My physics lecturers would be too busy getting to grips with the following quantum discoveries themselves to teach me about them!
- Young's double slit experiment confirmed that massive particles, and not just photons and electrons, exhibited wave-particle duality.
- Brian Josephson predicted correctly the quantum tunneling effect involving superconducting currents.
- John Bell put forth Bell's theorem, inaugurating the study of quantum entanglement.
- The Nobel prize in physics was awarded for the work on semiconductor lasers and quantum electronics.
Young’s double slit experiment did not rpt not involve more massive particles. Those experiments are much more recent.
I think Galu is saying that when he was a student many, many decades ago, Youngs dual slit experiment, when repeated with massive particles, also showed wave/particle duality as do photons.
You are quite right! My first listed discovery should have read:
"Young's double slit experiment confirmed that electrons and not just photons exhibited wave-particle duality."
Of course, electrons were regarded as "massive particles" in the company of photons!
To google deeper, it was the first time the double-slit experiment had been performed with a single electron.
Thanks, but I misread my source - a case of googling gone wrong.
However, back then an electron represented a "massive particle".
Note to self, always double google!
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Buy you miss the point, one which I made on this thread earlier, and that is that even really heavy particles relatively speaking, like protons, were used in recent double slit experiments. The humble electron is in no way a massive particle, but nice try. The upshot is that all matter exhibits wave particle duality. Even bowling balls. Hel-loo!
I note noone challenged my comment a few posts ago that Quantum Entanglement is ….wait for it…instantaneous! That‘s the whole point. younguys better read up on the famous experiment that proved quantum mechanics, the kayak, etc. Hint, it’s not easy to prove that a thing occurs instantaneously, not at light speed.
I note noone challenged my comment a few posts ago that Quantum Entanglement is ….wait for it…instantaneous! That‘s the whole point. younguys better read up on the famous experiment that proved quantum mechanics, the kayak, etc. Hint, it’s not easy to prove that a thing occurs instantaneously, not at light speed.
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Geoff, I do have a vague understanding of entanglement. The original famous lecture on this is by Sidney Coleman in 1993 as the Dirac Memorial Lecture. "Quantum Mechanics in your Face". Sidney was considered the top man on Quantum Mechanics at the time.
http://www.damtp.cam.ac.uk/user/ho/Coleman.pdf
The Youtube recording is atrociously bad quality if you look it up, the slides are unreadable, but gives you a taste for Sidney with all his autistic physical awkwardness, chain-smoking, and cracking jokes. Contains a cracking physics joke about string theory too, you can tell he thought it stinks even if he was buddy of Leonard Susskind. 🤣
Sidney mentions 2022 Nobel Laureates Aspect and Zeilinger in the lecture. Clauser did some fundamental experiments too. In Sidney's time it was largely all theory.
The thing about entangled states is; you may not know if, say, 3 particles are spin up or spin down, but you DO know they are all the same. So it is a prepared state in some sense.
This was the Greenberger-Horne-Zeilinger state:
https://en.wikipedia.org/wiki/Greenberger–Horne–Zeilinger_state
In measuring one of the particles, you know the state of the others even if they are light years away. But actually no information is transmitted spookily at a distance or faster than light!
As Sidney says:
I don't expect you to read the lecture unless you are an extremely keen. The bottom line is the Quantum GHZ experiment gets an entirely different statistics from classical mechanics.
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The point is that when you CHANGE a characteristic of one particle the other particle‘s characteristic changes instantaneously. See the difference?
Last time I read the Wiki GHZ page it was pure Quantum Mechanics in the BraKet notation. Now it's about QUBITS!
https://www.quantamagazine.org/new-...m-computing-10-times-more-efficient-20230825/
I really have NO IDEA what a Quantum Computer is. We must wait and see what the boffins are up to. Night All.
https://www.quantamagazine.org/new-...m-computing-10-times-more-efficient-20230825/
I really have NO IDEA what a Quantum Computer is. We must wait and see what the boffins are up to. Night All.