Archive for January 25th, 2023

ENTANGLEMENT, FASTER THAN LIGHT COMMUNICATIONS, CAUSALITY, etc.

January 25, 2023

Abstract: Faster Than Light Particle Transfer? Not Possible According To Special Relativity. But Faster Than Light Communications? Some Day, Probably. Using Quantum Entanglement… Not Particle Transport.

TYRANOSOPHER: Folklore based on a vague reasoning of Einstein says Faster Than Light Communications are impossible (a variant supposedly breaks the universe… see below). Having read Einstein carefully, yours truly determined that Einstein’s reasoning was flimsy (Albert himself hints at that in his original paper).

Most of Special Relativity stays intact if Faster Than Light Communication, FTLC are possible. ALL the equations, and thus the verifying experiments of Special Relativity stay intact. (See towards the end answers to objections).

Simplicia: Many people will write you off because you wrote off Einstein. They won’t read any further.

Tyranosopher: OK, I will detail in another essay my objections to the packaging of Special Relativity which forbids FTLC with great details. Below is just a sketch.

Now about Einstein: he is not God. Actually, there is no God. When I was young and naive, I approved (all) of Einstein’s critiques of Quantum theory, a theory to which he crucially contributed as number two, Planck being number one. Planck said emission of radiation was in grains, quanta, and explained two facts this way. Einstein explained that supposing absorption of radiation also came in quanta explained the photoelectric effect. Planck condemned the latter, but Einstein was right. Then other physicists contributed. The next huge conceptual breakthrough was De Broglie’s matter waves. Then CIQ (Copenhagen Interpretation Quantum) arose with correct physics, admirable math, but a sick un-realistic metaphysics. De Broglie objected and rolled out a realistic model of fundamental physics. Einstein seconded De Broglie, but they were overwhelmed by the launch of QED by Dirac. Then all sorts of strange and marvellous high energy zoo, then QFT, etc.

Nevertheless, after exchanges with Karl Popper, Einstein wrote the EPR paper on nonlocality, in 1935… EPR criticized Quantum Physics and its nonlocality from the “realistic” point of view. I am also all for Sub Quantum Physical Reality (SQPR), but I have an axiom neither De Broglie nor Einstein had. Science progresses one axiom at a time…

However, as the decades passed, and I deepened my understanding, I realized that Einstein’s admirable work was not as revolutionary and crazy as needed. 

Simplicia: The funny thing is that Einstein discovered nonlocality in the 1935 EPR paper. Which is one of the top ten papers in theoretical physics, and very hot today, as Quantum Computers use nonlocality.

Tyranosopher: Einstein was honest enough to not throw nonlocality out of the window. Maybe his conversation with the philosopher Karl Popper helped: Popper did contribute to the discovery of nonlocality. Einstein called nonlocality “spooky action at a distance”.

Simplicia: Now nonlocality is a proven experimental fact.

Tyranosopher: Yes the “SPOOKY ACTION AT A DISTANCE” which initially was a purely theoretical fact coming out of the axiomatics of Quantum Theory has been PROVEN over distances of many kilometers. One has to know the crucial difference of QUANTUM SPIN versus classical spin to see nonlocality clearly.

Chinese scientists have measured a minimum speed for this “spooky action at a distance”. I call it the QUANTUM INTERACTION, and assign to it a finite speed, TAU. This supplementary axiom contradicts Quantum Theory

Instead, classical Twentieth Century Quantum Physics says that Quantum Entanglement proceeds at infinite speed.

So this supplementary axiom of propagating finite speed nonlocality should be experimentally testable. I claim the proof of a finite speed for the Quantum Interaction is all around us: Dark Matter and Dark Energy are the results of this experiment, conducted for free by the universe itself. Amen.

Simplicia: What do you mean that nonlocality has been proven? Your friend Ian Miller, who is a physical chemist, denies a proof was achieved.

***

Tyranosopher: I admire Ian, he is a renaissance man, but don’t understand his arguments in this particular case. There are countless variants and proofs under the label “Bell’s theorem” in a jungle of tweaked axiomatics. Ian uses the classical Noether’s theorem… which doesn’t apply to Quantum situations. For once I will use an authority argument. The Nobel was given to nonlocality in 2022, and should have been given at least two decades ago to Alain Aspect. That could have helped physics.

To understand the simplest quantifiable proof of nonlocality one has to know about Quantum Spin and what has been experimentally discovered. Quantum Spin does NOT behave like Classical Spin. Classical Spin can be measured in all directions simultaneously, but Quantum Spin can be measured in only one direction at a time, and that erases preceding measurement.

https://patriceayme.wordpress.com/2022/11/10/proof-of-no-local-hidden-variables-from-magnets/

Building up on Einstein’s 1935 EPR, the simplest Quantum Entanglement which can be studied over a distance was elaborated by David Bohm in the 1950s and then studied in detail by a very small group of physicists, including CERN theoretical high energy physics head, John Bell, in the 1960s, to produce an experimentally testable inequality… which was given the Physics Nobel for 2022.

Simplicia: OK, many people have thought this instantaneous nonlocality could be used for Faster Than Light, FTL.

Tyranosopher:  Maybe. But one has to distinguish FTL and FTL Communication. FTL for massive objects is impossible, except by transporting a space bubble, which is pure science fiction of the extravagant type.

However if SQPR is correct and TAU is finite, one should be able, theoretically speaking, to create energy imbalances at a distance, after an elaborate technological setup, and thus create FTLC channels. 

***

QUANTUM ENTANGLEMENT SEEMS TO PRODUCE FTLC: 

Suppose we produce a state of total spin zero shared by two particles. (Particle streams, in practice.)

We keep one going in circles around Earth, and send the other to Proxima Centauri, 4 lightyears away.

Now say that, after 4 years, we measure the spin in the z direction in the Earth neighborhood, and we find |+>. Then we know that the other particle has spin |-> at Proxima.

So our measurement at Earth created a spin down at Proxima… Instantaneously

Now, with particle streams and synchronized clocks one could easily transform this into an FTL Morse code….

Except for one Quantum difficulty: we do not know how to get a |+> state to start with. We have the same probability to create a |-> state…We can’t make a stream of I+> states to start with, so we can’t type our FTL Morse code to start with! It’s as if we told a cosmic monkey in another room to type, but he can’t select letters. 

***

Hence the impossibility of Faster Than Light Communications rests only upon claiming to know something we know nothing about: can one NEVER EVER prepare, and, or NEVER EVER select Quantum states before measuring them? In other words, do Quantum States have tails? 

There is a so-called “Non Cloning” [of states] theorem…But the “proof” has a loophole (it depends upon assuming a unitary operator, thus denying there are quantum tails, exactly what it wants to prove) In truth, it’s an experimental problem: if what the prestigious French physicist Devoret at Yale and his collaborators is true, it has been possible to prepare some (contrived) Quantum states… but, SO FAR, it has not been possible to prepare Quantum states which happen to be ENTANGLED.

***

When some physicists pretend Faster Than Light Communications are impossible, they pontificate, because, in truth, we don’t know. And science doesn’t progress one pontifex at a time, but one correct intuition at a time. The intuitive case for FTLC is growing as the Quantum amazes us ever more.

***

What we know is that something we thought to be completely impossible, SWAPPING QUANTUM ENTANGLEMENT, is not only possible, but now so amply demonstrated that it is central to various developing Quantum technologies

***

SQPR assumes particles have complex structures, a linear part (the guiding wave) and a nonlinear part (the “particle”), the entire structure being unstable and prone to contracting at TAU, the collapse and entanglement speed. 

***

However, Quantum Swapping shows that, somehow, one can have Quantum Interactions without collapse, namely the propagation of QE.

***

Thus it is starting to smell as if one could interact with a particle’s extended presence without inducing collapse, and then select the type we like…

***

Simplicia: Hence FTLC should be possible?

Tyranosopher: FTLC through Quantum Entanglement would not contradict Relativity, because it would not change anything to light clocks, or for the equation Force = d(mv/(1-vv/cc))/dt. There would be no mass transport.

***

It all smells as if FTLC will become possible. That does not mean that Faster Than Light matter transport should be possible. The latter is impossible without warp drives.

Simplicia: Wait, don’t go. It is well known that FTL Communication leads to the breakdown of causality, and thus, sheer madness. Consider the excellent video:

https://www.youtube.com/watch?v=an0M-wcHw5A

Tyranosopher: Yes, beautiful video. Minkowski spacetime diagrams. Einstein didn’t like them, he didn’t like either Minkowsky or “spacetime”. It was reciprocal: Minkowsky, who was Einstein’s physics professor at Zurich Polytechnic, ETA, called Albert a “lazy dog” and made sure he couldn’t get an academic appointment. Instead a friend got Einstein a job at the Patent Office in Bern.

Simplicia: Can we get to the point? You don’t like spacetime as a concept, so what?

Tyranosopher: Notice that they draw these spacetime diagrams all over the galaxy’s real space, in various places, and then they draw a contradiction. 

Simplicia: Yes, so what?

Tyranosopher: Relativity was invented by Henri Poincaré to describe local effects. Basically local speed makes local time of the speeding object run slow. A fast traveling light clock goes slow when going along the direction of the speed, at the speed. From there after quite a bit of half hidden logic, plus Michelson Morley type experiments which showed the undetectability of speed within a ship cabin not looking outside (the original Galileo imagery), one deduced length also contracted, and so did the local time of the moving device.  

Simplicia: Thanks for the two sentences recap of Relativity.

Tyranosopher: The slowing down of the local time was amply confirmed with fast particle like muons, and in a slightly different context, GPS computations crucially depend upon time contraction of the orbiting satellites.

Simplicia: And then? Why are spacetime diagrams bad?

Tyranosopher: Spacetime diagrams are tangent space objects. They are, at best, local approximations. Extending a spacetime diagram to Vega has degraded meaning. Einstein knew this, he mentioned somewhere that General Relativity violates the constancy of the speed of light. And that’s fairly obvious as light could be put in orbit around a black hole. Now the silly ones cry that time would be in orbit around said black hole, and bite its own tail, etc.  Grandchildren would kill all their grandparents, etc. Silly stuff: they confuse local and global, although that’s the bedrock of differential geometry. Differential geometry is locally flat (aka “Euclidean”) and globally curved (or even twisted). But this is not even the worst…

Simplicia: How come this is all not well-known.

T: Long ago I gave a seminar along these lines at Stanford. Many of the best and brightest were in attendance, Hawking, Penrose, Yau, Susskind, etc. and not too happy from what I said. But my point about General Relativity making no sense without Quantum is viewed as trivially obvious nowadays.

Simplicia: So you are saying one can’t just rotate the spacetime axes of a moving spaceship and make deductions?

T: One can make deductions, but one can’t make deductions where local time of a moving ship becomes global time, as in the video I linked above. Earth can synchronize time with Vega, Henri Poincaré described how that can be done. But one can’t synchronize time with a moving spaceship (as those who claim to have demonstrated that FTLC breaks causality to). 

If one sends an FTL message to a moving spaceship, it does not get it in our past. It gets it in our future. Our past and our future are local… to us, and… Vega, if we synchronized time with Vega. A really silly mistake. 

Simplicia: Please stop insulting fellow intellectuals, or they are not going to be fellows anymore. And why did you link to a false video?

Tyranosopher: Right, let me rephrase this: it has been known since the onset of Relativity that at speed simultaneity is violated. So cause and effect can look inverted in a moving ship relative to what they are in a co-moving frame. That’s basic.The video misses the point, although it looks so reasonable, with great graphics.

Therefore, in the Special Theory of Relativity, causality can only be established and defined in the co-moving frame. (Same for mass, let be said in passing. Even the otherwise excellent Richard Feynman makes that mistake in his lectures. The video I linked above makes that mistake).

So claiming Faster Than Light Communications violates causality is erroneous! 

***

Simplicia: If and when do you think we can realize FTLC?

Tyranosopher: We are tantalizingly close. Some physicists (Devoret) adorned with prizes, glory and long careers claim that they can detect the preparation of a Quantum jump, and even that they can revert it. If that’s true, and we can apply that kind of selection to Quantum Spin, FTLC could be installed with Mars before humanity lands on the planet.

Simplicia: Are you serious?

Tyranosopher: Absolutely. 

Patrice Ayme  


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