They called him Ernie, Ernieeeeeeeeeee
And he drove the fastest milk cart in the west.
(Yes, I know we're talking about a different ERNIE, but I could not resist the reference to the namesake).
For computing history nerds, the names Tommy Flowers and Harry Fensom likely conjure up images of the code-breaking Colossus. But after the war, they also had a hand in creating a dearly loved, much-anthropomorphised, millionaire-making machine: ERNIE. ERNIE – Electronic Random Number Indicator Equipment – is the machine used …
"In this case, photons are sent towards a semi-transparent mirror and one of two events happens – reflection or transmission – which are associated with 0 and 1 bit values.
Surely that's not entirely random, I'm not sure how feasible it would be to create a mirror that would reflect exactly 50% of photons? Otherwise there will be an overall bias towards a 1 or a 0 over time?
Surely that's not entirely random,
Possibly (probably?) not entirely random, because of the reason you postulate, but likely random *enough*. There will be enough natural randomness in the movement of the photons towards the mirror that it won't be possible the seed or artificially influence where the beam lands in order to get a 1 or a 0.
Thinking on it a bit more , would such a theoretical mirror require such design/engineering that it could actually be determine a way to influence whether a specific photon gave you a 1 or a 0? Hmmm...my brain's starting to hurt now.....
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No, such a thing isn't possible. A photon interacting with this thing has a perfectly deterministic state (wavefunction) after the interaction in fact: it's just that that wavefunction is non-zero on both sides of the mirror. When the wavefunction is 'collapsed' (old-fashioned terminology) by the photon interacting with some macroscopic object (so, incrementing a counter or something) then the photon 'decides' which side of the mirror it's on. That decision is 'truly random' in the sense that it's not predictable in advance, even in principle, if QM is correct (see below).
Before it collapses the wavefunction may be skewed towards one side of the mirror or the other, which would mean the thing is biased one way or the other: this can be dealt with by measuring & correcting for the bias as other people have said.
'Truly random' is a bit subtle. We know, thanks to Bell, that if it were predictable in advance, then, if QM is correct, we can bargain that into being able to send information into the past. If we can do that then we can predict it anyway, just by sending the answer back in time. We can also, for instance, win all games of chance, like the stockmarket, and causality generally falls apart. There is strong experimental evidence that QM is correct (look up 'tests of Bell inequalities'), and assuming causality isn't violated then we can assume it is not predictable in advance. But this is subtly different than 'truly random': perhaps 'God' has a big list of all the future states of things and everything is determined in advance, just not from information within the system. This is called 'superdeterminism' and it's pretty easy to see it makes no practical difference: there still is no access to any information which allows us, within the system, to predict the state after the wavefunction collapses.
> Surely that's not entirely random, I'm not sure how feasible it would be to create a mirror that would reflect exactly 50% of photons? Otherwise there will be an overall bias towards a 1 or a 0 over time?
IDQ's website has a non-technical paper describing this. The mirror is within 10% - i.e. gives results between 45% and 55% and then an unbiasing procedure is applied to produce 0s and 1s at exactly 50% each.
I haven't looked at IDQ's site but bias removal is a well-established technique.
Group the output from RNG into pairs of bits. Discard any 'dibit' which is '00' or '11'. Assign the value of '0' to '01' and '1' to '10' (or the other way round).
Of course, if your electronic die is really rubbish, you'll have to discard lots of values. Maybe that's why they need such a fast, powerful computer?
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Not sure but one of the mysterious transactions looks very similar to 2* memristor chips + postage.
Yet I don't remember ordering them but did look at the page recently.
Also never got my 3 yellow OLED displays which I did order and no notification from the seller.
Wonder if I have a double somewhere with similar interests?
I guess your aunt didn't know the right handshake to get the "good" number bonds. Of course this new technology isn't the product of patriotic British boffins, so for all we know the numbers could be sent right back to the Gnomes of Zurich by Quantum Teleportation for "checking and recalibration" to make sure the right people get the biggies.
I'll get my tinfoil hat...
Are you sure that's the way they get the numbers? If they just keep generating random numbers till they get a valid one, it is theoretically possible to never get one!
On a much smaller scale, when I wanted to design a bingo number caller I created a list of the numbers 1 to 90, then shuffled them, after which I just pulled them out in order.
P.S.
Moving a number out of a slot then back into it is still a valid shuffle - but you try telling people that!
They don't in fact need to be in any particular order at all: if you just have a list of them, in any order, and then pick random entries from that list you're fine. I suspect the problem is knowing which bond numbers are still alive, although if that's the problem then I don't know how they know how to prune the dead ones after the numbers are generated anyway.
'On a much smaller scale, when I wanted to design a bingo number caller I created a list of the numbers 1 to 90, then shuffled them, after which I just pulled them out in order.'
And have you calculated how long it would take you to create a random order list of all valid entries (up to a potential 99,999,999,999)?
Your solution would certainly be more determinate, but is unlikely to be typically faster.
Is CECIL even random? How does it work? Is it magic?
I heard Rachel Riley just works out a calculation beforehand, discretely types the number in on a keypad which CECIL displays using its super-technical 3-digit 7-seg display, then Rachel substitutes the contestant's selected cards for those she used before and pretends she got the answer by scribbling her workings from earlier? It's all fake!
Now, to prove it all we need is a decent shot of her keypad ...
Interesting conspiracy theory, but I think it has the faint whiff of BS about it. The contestant is free to pick a different number of "big ones" from the top row or "little ones" from the other row,....*unless* the contestants themselves are in on this ruse, and are briefed in advance for what combination to ask for. Hmmm....the plot thickens.....
CECIL can't be totally random, surely? If a contestant gets a load of ones and a 25 (or all ones, if you don't have to pick a big number - I don't know the rules) and CECIL indicates 999 you'd be stuck.
Didn't Turing write something about "computable numbers"? He worked at Bletchley too!
When I see CECIL in an IT context, it always reminds me of Computer Education in Schools Instruction Language.
You probably have to be a certain age to get the horror of that!
I'd completely forgotten about CESIL....that takes my back to my 'O'-level days (last year of 'O' levels before they were replaced by GCSE, first year of the Computer Studies syllabus).
As I recall, everyone on the course had fairly extensive computer experience, so we basically wrote programs in assembler and then translated back into CESIL.
"I heard Rachel Riley just works out a calculation beforehand, discretely types the number in on a keypad which CECIL displays using its super-technical 3-digit 7-seg display, then Rachel substitutes the contestant's selected cards for those she used before and pretends she got the answer by scribbling her workings from earlier? It's all fake!"
Oh yea of little faith...casting doubt on the hugely talented Ms Riley !!
There have been a number of times when the target number has not been able to be achieved, either by contestants or by Ms Riley herself...and in the latter case, she freely admits it cannot be done.
So, either she is a very good mathematician, or these instances are used to cover up your so-called fake calculations ;-)
In one edition, Ms Riley admitted it was a simple random number generator that did not take into account the numbers actually displayed on the board. Hence why sometimes the solution is very easy and other times, when it is impossible to achieve.
If you want to know more about the original ERNIE 1, I have written an online simulation which is free to use and you just need your browser.
It's at https://ernie.virtualcolossus.co.uk and you can learn how ERNIE worked and get it to generate and print some bond numbers (although not ones that mean you'll win anything!). As stated in the page above, it's a phenomenal machine for it's time and was a pleasure to learn about and build over the past year!
I always assumed the real reason for building ERNIE was to generate random numbers for encrypting government documents.
I have won prizes from ERNIE, but only ever the smallest possible ones. Whereas I twice had a four-number lottery win, before they changed the lottery rules so that in effect they pay out only what they feel like paying.
[quote]ERNIE's activities are also checked before and after each draw by the Government Actuary's Department (GAD), which performs four tests to check the machine is truly random:
Frequency – whether every possible character in each position of the Bond number appears as often as it should
Serial – this looks at how many times one digit follows another, e.g. how often does a 3 directly follow a 7
Poker – this looks at the number of times consecutively generated groups of characters contain: four identical characters, three of a kind, two pairs, one pair, all different
Correlation – this looks for correlation between characters in two different Bond positions over a series of Bond numbers
[/quote]
If something is truly random then all of the above do not have to be true. Roll a dice 6 million times does not mean your going to get each number 1 million times. You can not give rules to what makes random random as it is random. 1 2 3 4 5 6 is just as random as 1 1 1 1 1 or 2 4 2 6 1.
"Dice" is the plural of "die". If you are rolling "a dice", you must be doing some clever quantum experiment with a virtual d****.
Leaving that aside, if you repeat the 6 million experiment a reasonable number of occasions, then each number 1 to 6 will turn up roughly a million times per occasion. The variation about a million will be described by the binary distribution, with a mean value of 1,000,000 and a standard deviation of 373. It would be one occasion in a thousand that the result differs from 1,000,000 by more than three standard deviations.
Similar statistical calculations can be made for the other scenarios. The testing of ERNIE would have been to check that these statistical estimates were duly observed.
That's true. But you can do the statistics on events like that and they are stupidly rare. In particular if a long enough sequence of purportedly-random numbers fails a randomness test, it is enormously more likely in practice that they're failing it because they're not random than not.
I think that the prize money is the interest the government pays on the bond (ie on the loan we make tothe government).
The only way the article makes sense is if you think of the premium bond bit of the government as beinga separate organisation which takes in money from us and then lends it, at interest, to other bits of the government.
(This comment reads as if I'm some kind of anti-premium-bond person: I'm not.)
I would think it's mainly a result of the slow (relative to the machine's operation) shutter speed causing several "counts" to be displayed during the time the "shutter" is "open" (i.e. the sensor is gathering photons prior to being read out and reset - its integration time) but there could also be a (small) element of afterglow from the ionised gas in the tubes - they don't quite extinguish instantaneously when the current stops (nor, indeed, is the switching speed of the circuits driving them infinitely fast).
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I'm pissed off with NS&I as they NEVER advise changes of their "rules" anywhere subscribers can INSTANTLY see them.
Like today, in Hong Kong, I was in receipt of my returned cheque for Atlantic Pesos (£) 720 which has infringed somehow on their CHANGED form for subscribing my miserable UK pensions (for several months) into the hands of my Granddaughter.
It was several years ago - when I had collected all the info that THEY could provide - that I decided that my pittance would be better served in passing on to my granddaughter - that they - and especially Jane.Platt decided to "evict" my own £50,000 holding a few days from the next draw on the specious argument that I had complained too much at being buggered around by them in my attempts to get my initial deposit secured for my granddaughter.
The thing that's always worried me is what happens post ERNIE. There must be systems taking the output and checking for valid numbers and matching these to actual names and addresses. I assume these will be normal IT systems with all the usual opportunities for errors. It's somewhere in this system that I think my numbers are being lost!
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