Researchers roll Einstein's dice: Developing a quantum random number generator
November 30, 2011
(PhysOrg.com) -- Quantum mechanics implies that uncertainty in experimental measurements are an inherent part of nature – an idea that Albert Einstein disparagingly characterized as “rolling dice”. This true quantum randomness, for which Einstein was concerned, contrasts with a conventional gaming die, whose motion follows the laws of classical mechanics and is therefore pseudo-random. With the right physical information about initial conditions, the outcome of a dice roll can be accurately predicted.
Now, reporting in the online issue of Optics Express, a National Research Council (NRC) team led by Dr. Benjamin Sussman has successfully used quantum mechanical fluctuations to create a physical analogue of truly a random die. More importantly, their die can be rolled extremely quickly and can be easily measured providing the potential to transform the security of future high-speed information networks – from encrypting military communications, to securing individual online purchases, to generating random numbers for lotteries, or in high performance computing applications.
Devices that depend on sequences of random numbers for their security are everywhere and sequences are used as cryptographic keys in numerous protocols. Yet fast and reliable generation of truly random number sequences continues to be a challenge. Most current technologies depend on number sequences generated by computational algorithms that are actually deterministic – only giving the appearance of being random. As technologies depending upon random number sequences proliferate, the fact that the numbers are not really random becomes increasingly problematic.
Dr. Sussman and his team have developed a novel solution. The researchers used stimulated Raman scattering to amplify quantum vacuum fluctuations of the electromagnetic field to macroscopic intensities. The high intensity allows them to measure the optical phase of the generated light pulses using convenient, macroscopic devices like PIN diodes – devices that are low-cost and high-speed. Team member, Dr. Philip Bustard explains, “Because the vacuum fluctuations are random, so too are the phases of the generated optical pulses. The phase measurements can then be converted into binary, generating the required random bit sequences.”
As modern security infrastructure and the digital economy put the secrets of governments, businesses, and individuals into cyberspace, it increases the vulnerability of this information to attacks. Dr. Sussman notes that, “While the rolling of dice has been essential to games of chance throughout the ages, the importance of random numbers has never been more apparent. Aside from its application in generating random numbers for reliable lotteries and gaming platforms, a truly random number generator will provide impenetrable encryption for communications – be they military transmissions, secure banking, or online purchasing – that underpin the modern connected world.”
More information: http://www.opticsi … -19-25-25173
Provided by National Research Council of Canada
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Nov 30, 2011
Rank: 5 / 5 (1)
Question though, even if they have truly succeeded in making a true RNG based on vacuum fluctuations, doesn't any use for security purposes still inherently ride with the protocols used to transfer said numbers ?
Nov 30, 2011
Rank: 5 / 5 (1)
http://www.fourmi...hotbits/
There are a few aproaches you can use
- (propely implemented!) entanglement. While this does not ensurethat no one else gets yur key it does make certain that you can almost immediately detect when someone is listening in on the transfer of your key (and you can then immediately stop it)
- physical distribution of such randomly generated encryption keys
Nov 30, 2011
Rank: 4 / 5 (4)
I wonder, though, if when we have better quantum theories we will come to realize that these fluctuations too are not random and really just more information is needed in order to accurately predict.
I have no idea if there is any merit to that, but it makes me think.
Nov 30, 2011
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Nov 30, 2011
Rank: 2.3 / 5 (3)
I would also not be surprised if these fluctuations were not random, but I don't think we'll ever have the ability to predict them nor to decode smoke from a burnt paper back into writing.
Nov 30, 2011
Rank: 1 / 5 (1)
http://www.physor...ics.html
that determines true randomness.
Nov 30, 2011
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Compared to these, a random bit streamer should be a very easy thing. We could have one in every computer and every phone and every networked device in the world.
Nov 30, 2011
Rank: 1 / 5 (8)
I don't believe in random.
Nov 30, 2011
Rank: 2.8 / 5 (13)
http://en.wikiped.../I_Ching
The basic idea is that it is the pattern the underlies all "random" events.
Nov 30, 2011
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The next physorg article will be generated by the quantum random number generator.
:)
Bring it on.
Nov 30, 2011
Rank: 1 / 5 (7)
Nov 30, 2011
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Donatello Dolce
(Submitted on 11 Nov 2011)
Generalizing the de Broglie hypothesis of intrinsically periodic matter fields, it is shown that the basic quantum behavior of ordinary field theory can be retrieved in a semi-classical and geometrical way from the assumption of intrinsic periodicity of elementary systems. The geometrodynamical description of interactions that arises in this theory provides an intuitive interpretation of Maldacena's conjecture and it turns out to be of the same type of the one prescribed by general relativity.
Comments: 10 pages, 7 figures, talk given at DICE2011 (Space-Time-Matter), minor corrections
Subjects: General Physics (physics.gen-ph); Quantum Physics (quant-ph)
Journal reference: J. Phys.: Conf. Ser. 306 012049 (2011)
DOI: 10.1088/1742-6596/306/1/012049
Cite as: arXiv:1111.3319v1 [physics.gen-ph]
Nov 30, 2011
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Cool paper, what little I understand. Periodic paths combined to show path integrals...?, being a Feynman fan, I find that to be a pretty interesting concept.
Nov 30, 2011
Rank: 3.7 / 5 (3)
Yet true randomness means also that 'free' will is possible.
But no one argues for true randomness. There are (infinitely) more possibilities than the false dichotomy between determinism and randomness.
Nov 30, 2011
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And as even in an infinite Universe, sensitivity can only approach (but never reach) infinity, there will allways be some "random" left for any of an infinite amount of observers, regardless of their position on an infinitely broad sensitivity chart. In other words, it is relative.
But for a QM observer, the lower limits of this sensitivity are very precisely defined by the planck constant and its derivates.
So from a "quantum physical" perspective (considering quantum fluctuations as being truly random), a "physical analogue of truly a random die" - as proposed by the scientists in question - might actually been achieved.
Question remains, however, how well this fares "outside of the QM box", ergo in the perspective of reality itself..
As for a truly random process to be truly random, it would have to directly violate any and every trace of causality..
Nov 30, 2011
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And that's maybe the problem..
Dec 01, 2011
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I agree that the concept of true randomness is quite mysterious. In fact, if true randomness exists, it can be thought of as the ultimate cause/source of everything. The easiest way to get rid of it, I would say, is to uphold the "Many worlds" interpretation of quantum mechanics. But that does not make the world any less mysterious.
Thou shalt not treat lightly the concept of randomness! ;-)
Dec 01, 2011
Rank: 1 / 5 (6)
I'd like to talk about this more if you'll entertain me...
I understand how if there were no true randomness then everything must be deterministic which means no free will, however I don't understand how the existence of true randomness provides the possibility of free will.
Free will is not random, if it is or is based on something random it is not will. It seems that in these discussions, and participate in many both here and on other forums, that everyone confuses free will with randomness. I don't see how the two have anything to do with each other.
If "free will" exists, which I don't think it does, it must be a fundamental force that conscious entities can control to assert their will over the other forces, and thus over physical law. This has nothing to do with anything being random. Freedom of will is the exact opposite of randomness, will is the exact opposite of randomness.
Dec 01, 2011
Rank: 2.6 / 5 (15)
Dec 01, 2011
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Free in the sense of 'not deterministic'. Not free in the sense of 'we can do whatever we want'. Randomness just means we're not robots.
Not quite: consider a closed system (chamber) with gas molecules randomly moving about. The velocities close to the edges of the chamber will not be equally distributed.
There are plenty of laws that do not allow determinism (e.g. radioactive decay where a atom can decay a number of ways). But that does not mean that all decay events are equally likely...so: no determinism but also no true randomness.
Dec 01, 2011
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I've been thinking it would be neat to make a little USB gizmo that uses radio interference. Such a device hooked up to a computer two feet away from another one would be receiving slightly different radio noise and so would generate different numbers. So the "scope" of a radio device is similar to the wavelength size of the radio waves that it's receiving.
It could be super cheap too, a crystal radio circuit and a tiny USB capable microcontroller is all that's needed (heh plus some software dev of course). In fact hrm I bet I have everything I need here to actually build this.
Dec 01, 2011
Rank: 1.4 / 5 (7)
Well no, randomness means you aren't a deterministic robot, you would still be a random robot...
You mentioned truly random elements in both of those examples... true randomness does not mean always observing a perfectly even distribution of possibilities... at least that's not what I mean when I say it.
Dec 01, 2011
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Even though it would take an enourmously big number of lifetimes of the universe for this to be ever observed it's not deterministic. Determinism is just a way saying "so close that it amkes no difference". But there is not really anything truly deterministic in this universe.
Dec 02, 2011
Rank: 1.5 / 5 (8)
That's your opinion based on the HUP and the bell experiments and such... frankly I think that we simply cannot detect the deterministic source yet, if ever. I think this because I don't believe in magic...
Dec 02, 2011
Rank: 1.5 / 5 (8)
Just because we don't know the cause of these seemingly random events does not mean that they do not have a cause and are actually non-deterministic. To think otherwise is foolish.
Dec 02, 2011
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The one does not follow from the other.
Consider proteins. The first protein at the very start of the evolutionary game had a certain chirality. Naturally all proteins derived therefrom down the ages will have that same chirality. The odd random protein with the opposite chirality will not have a chance once the other types get the upper hand. Random start - non-random series thereafter. No magic involved whatsoever.
Randomness does not mean equal distribution. Even if it did: equal distribution does not necessarily mean homogeneous distribution (i.e. it is quite possible to have locally skewed randomness with a global perfectly evenly ditributed random system. ) Again: No magic needed.
The antrophic principle would be a perfect example of this.
Dec 02, 2011
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Determinism would show up in the statistics. There are tests for randomness. Quantum effects conform to these tests very well.
If a larger system is non-deterministic then the sumtotal of all things it is based on cannot be deterministic (or those things are deterministic in such a way that they cancel each other out with great precision - which means they are linked in some way...which in turn makies them not *separate* underlying systems)
Dec 02, 2011
Rank: 1.9 / 5 (9)
I don't believe it was a random start...
I told you this a few posts ago...
It's simple, if something happens for no reason it is magic... that is the definition of magic. Random things are random because they happen for no reason.
Magic is the occurrence of something with no explanation. There can be no explanation for true randomness, therefore it is magic by definition.
Dec 02, 2011
Rank: 2 / 5 (8)
Not necessarily, consider your scope... you may have insufficient scope. Just like looking at n digits of a string of digits may lead you to believe there is no pattern, if you look at n*m digits, or n^m digits, or whatever, you may then see a pattern.
Great, but this is nonsense because you cannot determine if the larger system is deterministic or not without knowing whether or not everything it is based on is non-deterministic.
The "appearance" of non-deterministic behavior in a large system is not proof that it is non-deterministic. You have to have knowledge of ALL underlying mechanisms.
Dec 02, 2011
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'Random' is just a description - not a force. (Just like 'causality' is just a description - not a force)
Consider this: take a measurement of everything that can be measured. Ever. You'll now have a large (but finite) number of datapoints representing the entirety of the universe.
For simplicity's sake let's say there are only 5 such datapoints:
2, 4, 6, 8, 10
Is that causal (e.g. by f(t) = 2*t )
Or were they random?
Or generated by some other deterministic function (there are an infinity of polynomial functions alone that will get you that series)
You can't tell with certainty.
Causality went out the window 1927 with the Uncertainty principle. Only correlation remained (which, in macroscopic cases looks - but is not quite - the same).
Dec 02, 2011
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Dec 02, 2011
Rank: 5 / 5 (1)
I.e. the 'search for truth' isn't part of science (because there is no definite truth to be had from limited numbers of measurements)
On the other hand this ensures that there will always be science because if no FINAL answer can be had then - with more measurements - a BETTER answer can always be found than the one we have at any one time.
Then we must also remind ourselves that the universe actually has no rules - it just is.
Humans make rules to handle DIFFERENT things (events) with common classifications.
E.g. we say two hydrogens are the same, react the same, etc. but no two hydrogens are ever truly the same. At the very least their positions are different. Different positions mean - and be it ever so slightly - different environments. And hence - and be it ever so slightly - different behaviors.
Dec 02, 2011
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Dec 03, 2011
Rank: 5 / 5 (1)
Wanted to make a joke about a very particular set of famous deceased scientists turning in their graves, but decided not to :)
Thinking out of the QM box might seem impossible at first, but those who don't try, have no chance to succeed.. at least in a non-random, non-QM world, that is ;-D
Question for you: Was your decision to participate in this discussion deterministic,or just random, as proposed by you earlier? :-/
Dec 03, 2011
Rank: 5 / 5 (1)
Name one known "larger" system, that is proven to be of non-deterministic nature.. And by "proven" I mean with undeniable/undisputable evidence, which excludes "by HUP" or "by AWT follows",or similar nonsense..
Actually, the logically correct approach would be to ask: Why should it?
And last but not least,simply assuming no cause is nothing but flawed logic.
Dec 03, 2011
Rank: 1 / 5 (7)
Maybe because theres is no such thing as 'random' but I'm not going to get into this old argument. Suffice to say, CHollman, I tend to agree with your comments.
Voltaire (or not?) ..
'Chance is the known effect of every unknown cause'
Dec 03, 2011
Rank: 5 / 5 (2)
But by carefully following this very logic of yours, you can ALLWAYS "back-track" one-more-step-back in any process!
Like for example, that there was a particle interaction involved in the determination of chirality of the very first protein. You might then say, that it was THIS interaction, which was the "initial random source". But then again, the source which gave the particle its energy to affect the protein, actually came from a nearby cosmic ray particle collision, which just happened to be in the right place at the right time, and with the right ammount of energy.. And then yet again, the path of this CR particle was affected by a myriad of other interactions (like with gamma rays, for ex.) before it finally collided. Then you come to what caused to cosmic ray, and what caused the event that caused the CR. Then what caused the CR particle itself to even exist in its specific shape and form.. and so on..
And you keep backtracking and backtracking, till at some point you come to the inevitable conclusion, that the only possible source of any "randomness" in the Universe would be the very initial impulse/moment of its CREATION! Of course with the absolutely necessary assumption, that there was a beginning, to begin with..
And then, what if that beginning was not an "absolute" one? ;-)
Dec 03, 2011
Rank: 3 / 5 (2)
So it shouldn't be strange, that recently the detection of local path during double slit experiment and/or indirect measurement of quantum function was achieved. It's a bad message for formally thinking physicists, who are considering the quantum mechanics too schematically.
http://www.nature...344.html
http://www.nature...120.html
Dec 03, 2011
Rank: 3 / 5 (2)
The trick is, with pure surface waves we really cannot observe the underwater effects, even at the water surface, which is serving as an analogy of space-time at the AWT. So, if we would take the wave mechanics too schematically, we would exclude the violation of statistical character of QM with AWT too.
But as we know, the real physical waves at the water surface are never pure transverse ones, so that the worlds of indeterministic quantum mechanics and deterministic general relativity are always mixed, at the CMBR wavelength scale in particular.
If they wouldn't, we couldn't exist here, after all.
Dec 03, 2011
Rank: 5 / 5 (1)
But what's the use of writing it here? Half the readers don't even understand the difference between random and arbitrary.
Dec 03, 2011
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Who claimed that everything is known? No one did.
This was a thought experiment of what would happen if everything _were_ known. Showing that even then you could never be sure of your laws or whether everything is random.
Atomic decay. Anything that depends on atomic decay by extension.
Tunneling. Any kind of interaction where tunneling can happen (which means all matter-matter interaction).
Dec 03, 2011
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When it comes to what I "believe" in, reality is either deterministic, or it is not. There is no "in-between", as proposed by many, to keep their pet QM interpretations alive.
Also the conclusions about the concept of "free will" are in most cases wastly exagerated. My take on a superdeterministic explanation of "free will" is, that even if reality is supercausal, the effects within are not determinable with arbitrary (absolute) precission, because cause is infinitely fractionable in nature.
So the idea of "free will" is conserved, at least to a certain (approaching infinity) extent.
Dec 03, 2011
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Nope. Occams Razor would indicate that it's simpler to postulate no law (i.e. randomness) than to postulate a law.
To have a law you need to have a reason why that law is the way it is - which forces you to declare a metalaw. that metalaw again needs to be supported by some rationale - ad infinitum.
So having no law seems one of two ways out of this. (The other alternative is to have 'all laws' and a multiverse model)
Dec 03, 2011
Rank: 1 / 5 (1)
Dec 03, 2011
Rank: 5 / 5 (1)
as it directly and inevitably implies, that "everything that ever existed", is absolutely FINITE (notice the CAPS in my former quote).
You wish..
Even more ridiculous of a wish..
If atomic decay would be completely random-based, there also would be no correlation between various atomic nuclei and their half-lives. Just because something is not measured or of unknown nature/origin, does not make it automatically non-existent. Ditto about tunneling..
Dec 03, 2011
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So actually, what you are proposing is, that it is better to have nothing, than something? And that it is better to assume no reason? Interesting.. Though I might preffer a somewhat different approach to that matter.
Again, dragging poor Occam to extremes, with the "all laws" interpretation being the opposite extreme. Maybe the concept of fixed "laws" is just not appropriate to describe all of reality. Relativity was a nice example on how a lot of commonly accepted "bombproof laws" can be so missleading..
Dec 03, 2011
Rank: 1 / 5 (1)
At the water surface the underwater cannot be observed with surface ripples at all. Is it because the underwater doesn't exist for surface ripples because it's zero? Not at all, it's because the motion of water molecules of underwater is too random for highly organized surface ripples. AWT presumes, the seeming emptiness of space is realized in the same way. It means, the randomness can explain even the seeming zero state observed without violation of macroscopic causality.
We cannot observe many things as a real because they're too random. After all, whole the mainstream physics refuses to research many boundary phenomena not because they don't exist as such, but because they cannot be reproduced easily.
Dec 03, 2011
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Dec 03, 2011
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it's because the cummulative effect of motion of water molecules of underwater (the part that does not mutually cancel out) is mostly too small to be discernible/measurable, in comparison to the relatively well defined character of surface ripples. (fixed it for you)
But it doesn't mean that the effect is non-deterministic (eg. random) in nature. Something is still leaking through, from "the underwater", albeit maybe very miniscule in magnitude. This usually manifests itself as part of the "random" background noise.
And then there are the more significant macro-effects of "the underwater" on the surface, like rogue waves, or even tsunami, which have a somewhat more signifficant effect on the shape and form of surface ripples, which apart from other mechanisms, is also caused by the acceleration / kinetic energy transfer between the molecules of "the underwater" and the molecules of the surface (including thermal energy).
Dec 03, 2011
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This is probably why the dense aether model is so difficult to grasp with schematically thinking people. It deals with the observable reality just from perspective, which isn't directly observable.
Dec 03, 2011
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But the another aspect of this prediction is, the alleged gravitational waves are equivalent to this noise and they're superluminal, because the underwater waves which are penetrating the surface as a Brownian noise are always faster than the surface waves.
Dec 04, 2011
Rank: 1.5 / 5 (8)
The simplest explanation in your opinion is that there is no explanation?
Dec 04, 2011
Rank: 1.5 / 5 (8)
True freedom of will requires direct conscious monopolistic control over reality. It would require each of us to be able to manipulate the effects of causes at the lowest hierarchical level of existence... otherwise events at lower levels than that which we control would affect us and prevent our will.
Dec 04, 2011
Rank: 1 / 5 (6)
I'm just kidding, it's one loser who registered like 8 accounts and has nothing better to do than downvote all of my posts for a reason I can't even remember because I am not a weirdo.
That's okay though, as far as I can tell given the evidence I have you have no ultimate control over your actions, free will is an illusion, you are as destined to act like a petulant child as I am to deride you for it... I do enjoy the dance though, even if neither of us are leading.
Dec 04, 2011
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Dec 04, 2011
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I know we've heatedly disagreed on things in the past, so it's good to know that there are still people here who can remain impartiality and not carry a grudge from one topic of discussion to another, a real sign of maturity and rationality... others would do well to take note.
Dec 04, 2011
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Dec 05, 2011
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