Quantum Computing for Dummies : A Simple Explanation for Normal People

Quantum Computers Explained ! In this video, I provide a simple explanation and overview and also discuss the implications for artificial intelligence, self-driving vehicles, and more! Enjoy.
This video is a bit outside of my norm, but I thought it might be useful for someone looking for a less technical explanation on the topic.
Let me know what you think in the comments! If this helped you (finally?) understand Quantum Computers, feel free to share it.
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Artifact - The Dark Contenent by Kevin MacLeod is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
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Artist: audionautix.com/

[@TashiRogo]

"The Grover operator sweeps away all the wrong answers" And along with them, the simple understanding of quantum principles

[@alexp-ru]

I've read and watched every single possible explanation of quantum computing and it always comes to "Imagine you can solve every problem in the universe in 0.00001 nanoseconds - well that's what quantum computers do". Seems like they miss a step or two, seems like promotional videos to me. I love this one: every qubit can be both zero and one at the same time - so you have a right answer every time - huh? So it produced random crap?

[@joeshmoe7967]

@@alexp-ru I just posted similar. All we got was quantum is faster...we already new that. We still don't know how it can try all the answers at the same time and simultaneously sweep away the wrong answers. Really, Grover could have given us this non explanation. One thing I did get was how dangerous this level of computing will be. Controlling all of are cars, and routes 'for safety' riiiiiight. No government, or agency or group of 'they' would ever want to control our every move in every way..... It is good to be older, I will die before the huge SHTF moment that is on it's way

[@nozack5612]

Grover Algorithm - Explained With Visuals available on KZbin

[@evelynashe8701]

I don't know about that. Automation is coming on fast, and I believe within maybe two more crashes, labour will be almost entirely obsolete and dependent on a stipend/begging the state to survive. The capitalists have already destroyed unions, the only tool that empowers workers to have leverage, there's no cost to them t steadily replace us with robots, and simply leave us to die as 'externalities'. They get their utopia of the rich, so why keep the 'deplorables'?

[@bobcaterino2690]

watched it again ...my question is clearer, but I still have it...Doesn't the Grover Operator need to KNOW the correct answer before it can SWEEP it away? and doesn't it have to sweep them away one at a time like a conventional computer would?

[@jscottupton]

Will quantum computers have a 3.5mm headphone jack??

[@joewhittaker1540]

sadly no

[@maximem.ste-marie3578]

@@joewhittaker1540 he actually did and not at the same time lol

[@rishabseshadri3691]

Hopefully I wish to think that at least a computer that is so advanced is still better than the fact that THE IPHONE DOESNT HAVE A HEADPHONE JACK AAHHH

[@DonPers]

It will have the best headphone jack in the whole universe

[@5amH45lam]

It'll have every sized jack in a single port!

[@Jebicore]

This is the best explanation i've seen in these days searching a starting point to QC understanding. The key is the Grover operator description. All other videos about QC forgot this step.

[@marktime9235]

Where's the idiots guide to the Grover Operator??

[@carloshoratio5100]

The Grover operator he's talking about is not a fundamental feature of quantum computers; it's really only pertinent to the so-called Grover algorithm, which is a quantum algorithm for quickly searching a database for a particular value. Quantum computers can do other things too; that was just one example.

[@omegapointil5741]

The Grover Operator is just a term, it doesn't relate how any sweeping gets done other than to declare that it does. "A rose by any other name would smell just as much like bullshit."

[@VEGETADTX]

You stole the words from my mouth. I was about to write a veeery similar comment :) I'm watching these videos and shake my head in disbelief that none of them mentions the KEY point that is - Grover's Operator, without which everyone who's new to quantum computing will be left disappointed saying "but but but...HOW DO WE ISOLATE THE RIGHT ANSWER FROM ALL THE BILLIONS AND BILLIONS OF INCORRECT ONES!?!?!? it would still take n amount of steps, wouldn't it!?!?". And surely that was my frustration when I was learning about quantum computing. Conclusion: people are TEEEEEERRIBLE at explaining things to newbies and oftentimes they don't even understand the concept themselves but just regurgitate what has been already said. This guy however is one of the rare ones who is good at explaining things, he thinks clearly, logically and in a "step by step" manner. My only complaint is that he didn't explain Grover Operator briefly just to make sure that the newbies to quantum computing understand the ENTIRE concept of how quantum computing works. But hey, at least there should be no "but but but but...." moments after his video for whoever knows the basic principles of quantum mechanics.

[@brooklynfoodz]

Agreed

[@SeanOng]

Lots of mixed comments in here, some saying things along the lines of "at last, I understand!" while others are saying that I've not explained anything. Clearly, the video is perfect for some groups but not others. This video is for people who seek a basic understanding of the concept behind quantum computers, rather than the technical and mathematical details or quantum theory. For those looking for more details on the Grover algorithm, but still intimidated by all the equations of Wikipedia and other online sources, read below: It's true that I don't go into the depths necessary to fully dissect quantum computing - that would require a good chunk of time spent on quantum entanglement, spin of atoms, quantum probabilities, and walking through scenarios of qbits and how the Grover algorithm iterates until it finds the solution with high degrees of confidence. Suffice it to say, the Grover algorithm works because quantum particles are entangled - they are related to each other. So when you observe one outcome, you can make a guess with much greater probabilities about other outcomes - due to entanglement . This allows you to guess your answer far fewer times and arrive at the answer with a very high (though not 100%) confidence than just random guessing using a traditional computer. I recognize that's still an inadequate answer that uses no math - but hopefully that will be enough for most of you. If you'd like me to make a video series to go from beginner to quantum computing professor, let me know :)

[@MVargabass]

Thanks for the video! I really would like to see more videos on this topic! Thanks

[@sarojchaudhary4745]

Finally understood.

[@ashwadhwani]

'high degrees of confidence' - this asshole just doen't quit does he?

[@sammybrown84]

I embraced computers only to a point. I use them rarely. This was a great explanation for me. Helped a lot.

[@brooklynfoodz]

I say you accomplished what you set out to illustrate. I had trouble understanding, after watching many videos and now I get it, better. Thank you for your work!

[@_S.H_]

I remember when I studied Computer Science at university and learned for the first time how electric signals are processed in transistors and circuits to make simple mathematical calculations and form the basis of the CPUs we know today. I was in awe when I understood those basic principles which were logical and made sense. But this Grover Operator thing is beyond me and I feel it will take me millions of years to understand.

[@justincase8532]

I too studies computer science and honestly, I think quantum computing is impossible.

[@WokerThanThou]

My workaround (whether it's right or wrong) quantum bits appear to be doing parallel processing - doing all possible solutions at the same, then doing a check compare of all possible answers for the correct one at the same time. The mechanics of it idk; but, it's a start.

[@Channel0.7]

It was simple indeed. I went through a lot of videos to understand quantum computing...yours was the simplest to understand. Thanks mate

[@tommyjones1357]

I disagree. He explains what they do but fails to explain how.

[@cryptoinside8814]

Here is a much better explanation....kzbin.info/www/bejne/nZCskombpbN3ipY

[@iani_2020]

He didn't expkain anything about quantum computers. It's a same difficult video like others.

[@a552bcx]

​@@tommyjones1357well make your own video if you think you would do a better job.

[@MarkMwai254]

Thank you so much for this explanation, I watched like 5 videos before this and still didn't understand, but I got your explanation instantly. Thanks!

[@5amH45lam]

1st time viewer - instant subscriber! Better explained than that by a highly qualified quantum physicist in TedX's explanation of quantum computing. Thanks for sharing your knowledge. 👍

[@dragonfire2110]

Sean, this is the best explanation of quantum computing that I've ever heard. Thank you for breaking it down using common language and simple analogies.

[@chunglee6895]

How about a short explanation for Grover Sweep , or this presentation is incomplete

[@drm437]

Really really helpful. Thanks a bunch. Best explanation yet for someone like myself. I would love to better understand the actual process of how it does what it does.

[@mephistodood82]

Thanx Sean, the end cut you threw in there was the most perfect depiction of the results of developing quantum computers

[@MrElectrifyer]

Very informative! I've heard about quantum computers in my past programming/digital signals courses, but all this while, I've just thought of them as faster computers, didn't know the rational logic behind what makes them faster...until now :)

[@donstevensii4509]

Thank you for sharing sir. Question, can you please expand on the difference (time-wise) between today's computers having to search each possible option (often taking less than half attempts) and the Quantum computer searching them all at the same time, THEN, the "Grover" method is used to check all them for inaccuracies before narrowing down the correct one?

[@scj00380]

I heard Michio Kaku talking about quantum computing on a BBC radio programme this morning and was enticed to find out more. Your video was really simple to understand. Thank you.

[@chandrag2536]

Great explanation. Helped me understand without having to fully understand Schrodinger wave equation or superposition theorem.....thank you...

[@francevenezia]

You are right! THAT WAS ALOT EASIER TO UNDERSTAND! THANK YOU!

[@kikittt]

I understand the 4 qubits are all the numbers at the same time but doesn't the processor ( Grover operator) still have to go through all the wrong answers sequentially?

[@kiumarsaryana3651]

Oh man you are awesome... I have been reading articles and watching videos for the last 24 hours and I hadn't gotten anywhere.... Thank you Sean for your great explanation. Now it actually makes sense. It would be great if you could make another video explaining Grover sweep operation. Thanks.

[@williamjayaraj2244]

Thanks for explaining about the quantum computer basics in a simplified and easy to understand way.

[@SteveGergetz]

Your starting point was perfect, and the explanation progressed very well, and then you just stopped explaining and switched over to ramifications. I still don't have the foggiest idea how a quantum computer can try all solutions at once. Isn't there some middle ground between the super technical explanation and the too-simple-to-be-of-value explanation you gave here?

[@XZeroOneArmour]

which now brings us to the million dollar question: the Grover operator. one who masters it Masters it all.

[@eu90770]

The best explanation of quantum computing out there. I tried many other videos without sucess. Good work

[@melaniex6715]

This was a great video! Thank you for all the useful explanations and examples

[@bobcat862862]

BUT BUT BUT....Until you explain this "GROVER SWEEP", you haven't done your job...lol....goo video all the same.

[@JustinHappenstance]

I think grover sweep would mean constant wrong answer ultill it is right.

[@menjadisarjana9235]

Then how it's different than putting every answer one by one?

[@adhisanjaya235]

hahahahah ya, explain that "grover" wkwkwkwkwkw, please

[@genome692002]

Maybe Their just parallel procesing the all possible bit combination at the same time to see which one is righg . But thats not quantum shit. Its called parallel processing...

[@GR-uk5ou]

It uses a classical computer to sweep away the wrong answers.

[@carloshoratio5100]

I think it's a bit misleading to say a quantum computer can process every possible input at once. While you can operate on all 2^n possible inputs of a sequence of n qubits at once, a measurement of the state of the n qubits will collapse the superposition to a single possibility. You cannot in general get the results of every 2^n operations with only a single iteration of the operation. Even Grover's algorithm, mentioned at the beginning, will not find the correct password immediately: on a classical computer, if there are N possible passwords, then it will take at most N tries to get it right, but on a quantum computer it will take as most the square root of N to get it right. Certainly a speedup over the classical algorithm, but still not instantaneous. Quantum computers are unfortunately hugely limited by the fact that measurement collapses superposition states. They are not as powerful as you might think. There are, however, some cases in which it is possible to use quantum mechanics to your advantage to gain a speedup over a classical algorithm, some of these with drastic consequences (look up Shor's algorithm).

[@JG-Zonic]

OK, I think your comment is pointed at the question that I had while watching the original video. Unfortunately, my understanding of the material is not sophisticated enough to understand completely what you just said though. My question is: how come it's not instantaneous? As in the video, if the Q-computer will try all possible solutions at the same time because each bot can be both 1 and 0 at the same time...where is the time loss? I have a feeling this could devolve into an existential issue. LOL Anyway, thanks!

[@carloshoratio5100]

So a quantum computer can, in a sense, try every possible solution simultaneously, but you can only actually observe the results of one guess because measurement of the qubits' state collapses the state to a single possibility. In order to actually gain useful information from the quantum computer, you would have to run the operation multiple times. As an analogy, imagine you have 100 coins and you want to count up the number of heads and tails. But, every time you look at one coin, every other coin gets tossed again. You can toss all the coins at once, but you can only see the outcome of one of the tosses without changing the state of the coins. In the case of guessing passwords, in order for the computer you're trying to break into to determine whether the correct password was given, it must measure the state of the input qubits. So even though you have set up your qubits to be in a superposition of all possible states, including the correct password, only one will be "chosen" to go through to be tested. There is a way to use a quantum computer to guess the correct password in fewer steps than a classical computer could. It's called Grover's algorithm. It cleverly gets around the limitation of superposition collapse in a somewhat complicated way that I don't quite remember. But it cannot find the password instantaneously. And by instantaneously I really mean in constant time; a "constant time" algorithm is one that take always takes the same amount of time to complete, regardless of the size of the input. The time it takes Grover's algorithm to complete is proportional to the square root of the size of the input, which is still faster than the fastest classical algorithm, which takes time proportional to the size of the input.

[@JG-Zonic]

That coin analogy was perfect! Thanks! I need to do some more reading about Grover's algorithm i think. I'm still feeling pretty fuzzy about that. But, thanks for the reply though.

[@carloshoratio5100]

No problem, glad that helped! Grover's algorithm is really just an example of one thing a quantum computer can do better than a classical computer. I would suggest learning more about the basic structure of quantum computing before trying to tackle any particular algorithm. Once you are comfortable with the underlying math, quantum logic gates, and measurement, then you should be better equipped to deal with Grover's and other quantum algorithms in detail. I'd recommend David Mermin's textbook on quantum computing for a good introduction. It's aimed at junior/senior level undergraduates in either computer science or physics (it does not assume specialized knowledge of either field). It may be a bit difficult (I don't know how much math/physics you know), but if you're feeling up to it it's an excellent introduction.

[@carloshoratio5100]

Oh and you can find Mermin's lecture notes that the book was based on for free, they're on his website for the course he used to teach at Cornell University. Just google "quantum computing mermin" and it should be one of the first few results!

[@johndouglaswilson7504]

Thankyou that was a very thought-out video, and was helpful.

[@oumaimaelrhazal5649]

Thank you so much for this amazing explanation . I understand now very well what is quantum computing.

[@TilekMamutov]

I love the coin toss analogy! Thank you!

[@davidgraham9577]

Thanks Sean, best simple explanation I have seen todate, if that is even possible. l love your analogy of a spinning coin representing both answers at once, until it is stopped/observed.

[@lucasceni8833]

Thousand likes for the explanation about finding the right answer. I'm watching & reading about QC for one full month and this is the first time I saw someone explaining about the Grover op. Thank you so much!!

[@WPB2022]

Thank You for getting me started ... very good & simple explanation; Now need to understand how does Grover Operator work.

[@logosfabula]

Love your way of explaining: the clarity, expressiveness, the tone, the rhythm. Congrats!

[@GaryduPlessis]

Can you please make a video for "really dumb dummies" because that didn't explain anything except how awesome Quantum Computers are.

[@adocarpel7770]

I also do not understand if something has all the values at the same time ... How to discard the wrong ones?

[@adocarpel7770]

Maybe they do not discard them, they use them directly, that is to say key = 0100 Quantum value vq = 0100 | 1000 | 1111 | ... Now: Is the quantum value equal to the key? Yes if (vq == key) return true;

[@sup2069]

The way I'm seeing it, correct me if I'm wrong, but wouldn't the quantum computer (the one doing the hacking against a standard computer), tax the standard because it's trying to accept all those passwords at once?

[@stevesatterwhite5141]

I do not believe it is possible.

[@ashwadhwani]

I think his mom made him make this video to 'feel' useful.

[@developer20xx41]

Thank you kindly. Very informative, beautifully explained with the spinning penny. The Aha moment for me was when I realised you reminded me of Screech from Saved By the Bell. Keep the videos coming

[@arnobertogna4718]

The best explanation I’ve ever heard - was able to comprehend the explanation - excellent

[@Oliverthehound]

Thank you. I finally understand! I've watched endless videos trying to understand. Finally I get it. Thank you!!

[@PongbolIEMVICHARANA]

Me too

[@whatdamath]

brilliant!

[@sunmanpatoo]

Hello wonderful person! Hare Krishna!

[@wiseanonymuos2756]

What is brilliant a about this???it's kinda stupid to me...how right and wrong can get one right???

[@cryptoinside8814]

Really ?? How about explain it back to me. I don't think he did a good job at all.

[@nirmalyaram2029]

This is by far the best video that explained QC in the simplest form.....Damn good bro!!! Keep it up.👌🖒

[@SethGamingLegion]

Awesome video, you are truly gifted and got this across perfectly!

[@kcvinu]

Hi, This is the best qc explanation i found on internet. But what is Grover Operator. How it decide a qcbit is either 0 or 1 ?

[@carloshoratio5100]

This "Grover operator" is not a fundamental feature of quantum computers; it's just part of one specific quantum algorithm (Grover's algorithm). Essentially, Grover's algorithm finds the unique input of some unknown operation that produces a certain output, for example the unique password that gives access to the computer. The Grover operator is just the set of operations that make this work, analogous to a circuit composed of logic gates in a classical computer. Quantum computers can do many other things as well! Unrelated to Grover's algorithm, we know whether a qubit is 0 or 1 by measuring it. How we measure it depends on how our quantum computer is physically representing qubits. One possibility is to encode qubit states into the spin of a photon. We have ways of measuring a photon's spin, so in that case that is how we would determine the state of a qubit.

[@RuiChui]

Jeez! What an awesome presentation - simple, concise and to the point! Just spent 20 minutes listening some IBM guy trying to explain it and he didn't even come close. Excellently done, Sir!

[@-danR]

Before he explains how a quantum computer 'checks' all the passwords in one go, he has to explain how a _classical_ computer 'checks' passwords one at a time. _He hasn't done this._ What password, on what system, is the computer 'checking'? How does the computer _know_ which is the right one? Brute force trial and error? OK, but what meaning has that analogously with a quantum computer? How does a quantum throw superpositioned qubits at another computer brute-force-wise? It can't simply stare at some 4-qubit entity and determine the correct password unless it already knows the right answer _a priori,_ or can look up the answer in the back of the book. He needs to find a less hackneyed, and inherently opaque, example than "checking passwords"... such as the traveling salesman problem, where the best (or at least a highly optimal) solution is evident by comparison-checking.

[@jimroberts7178]

Clearest explanation I've seen so far! I like your coin flip demonstration. Thanks!

[@missouripacificproductions4955]

Thank you this is one of the easiest ways to understand quantum computing I've heard yet

[@nerraw02]

This the best possible explaination I learned since knowing about these quantum stuff

[@MATTINTEXAS19]

Mind is officially, BLOWN!!!! Thank you sir...

[@jedikilla10101]

Ypu have earned my subscription for making me feel like i can go back to the documentary i watched about this and understand it

[@aceron54]

Most understandable video I have watched, great job explaining!

[@crazyrichwumao]

This video just destroyed Yoda’s famous saying “do or do not, there’s no trying.”

[@Splaterpea]

🤣

[@avioberoi8511]

can it run crysis 3 on 4k 100 fps ultra?

[@leozanna2861]

Милен Байков It might even have more than 8k if we invented more.

[@Angeluz1824]

No. it can NOT. that is the problem when trying to explain something difficult to understand in easy words. you get a miss misconception. this video explains better why not. kzbin.info/www/bejne/nZCskombpbN3ipY

[@sandmansw6297]

Miguel Duron thanks see what you mean

[@jorgendnilsson]

It could run ALL the Crysis at the same time, to find the best one.

[@megalibra82]

you know what;s the biggest crysis is that it cant predict human behavior since it can track every electric signal in our bodies or DNA activity or cellular interaction so it will read your mind...farewell free will...even A.I will be depressed because this Oracle will show him the future. am serious it will predict to the level of butterfly effect, where wind blows, earthquakes, weather and to the level of viral disease spread . there is just no limit. I don't know if it scary, depressing or should we control it....I think even lottery will disappear if this technology see the light of day.

[@jerrybender6633]

Sean where did u go? Please take more complex subjects and apply ur brilliance to them!! This is ur calling and thank u so much for this video its pure gold

[@tommluc]

Finally an explanation that mentions the real heroes... the processor! Having instantly ready millions of input combinations is amazing, but it is this "Grover Operator" who will do the hard job. Congratulations for mentioning it.

[@bennyandersen742]

oohhhh my, so how does a "GROVER SWEEP" work, the mystery just pushed up one level, or down?

[@mikexhotmail]

:) thanksssss I am your big fan.

[@luckyvet]

Me 2, he explained it so simply!

[@atheeralharbi167]

This is the best Quantum Computing explanation video on KZbin! Thank you!

[@manuelherrerahipnotista8586]

Great, Great, Great and SIMPLE! Loved the coin example. Thanks for this man!

[@dboooshi]

youre so sick! amzing explanation. loved the video

[@djahvelle]

He lost me at "Let's say we're trying to crack a password" 😂😂🤯

[@nehaal]

Wasn't that at the beginning😂

[@fredflintstone8998]

Lost me too!!

[@DeltaRoSigma]

Best explanation online so far I've seen to explain this. The others were just fancy animations with science lingo that made little sense to the uninitiated.

[@tjmagon9744]

THis is the best Quantom Computer Explanation I ever hear! Easy and Fast not like the other video does that take some time 10 mins. or more. thanks for explaining dude! :)

[@JordanService]

Great video, however, you are very incorrect about the conclusions surrounding AI. The problem comes around knowing what defines "better". QC may have all the answers for bounded problems, but they don't have the answers for unbounded bottom-up creative processes. They are an inherently different mechanism.

[@kashutosh9132]

You could be right about unnounded but cant it turn unbounded into bounded by putting up mini and maxuma or assuming a boundry

[@Dambam_Studios]

Wish i could give you more than just a like

[@SomethingWkd]

Absolutely brilliant. Like others, would like an explanation of the Grover Operator. But a great exposition of the principles and the potential - thank you!

[@gibfear]

I reckon it's the same bollocks I keep coming up against with this, quantum computers can calculate the answer you already had faster than anything else!!!

[@razgrizadler]

Crystal clear and simple explanation thanks a lot!

[@ChrstphreCampbell]

It might’ve been nice if he suggested, just for a moment, how a Grover operator works in its most elemental theoretical sense ?

[@princesscrem]

Aha indeed!

[@ashutoshsingh7838]

How amazingly you explained sir.... awesome 👌🏻👌🏻

[@hg2.]

Best video I've seen on this subject. Thanks 😊

[@XTRMJ]

What this video does not explain, as well as none of the other videos that attempt to explain "Quantum Computing" QC, is how are the Q-bits exactly used to solve a problem, or how the "Grover Algorithm" works. It leaves that "conundrum" as a "Black Box",... & that is why everyone goes,... What,... ??? Anyone who has studied either Engineering, Electronics or Computers know exactly how "Bits" are manipulated, even at the "machine level". But I have to say,... these videos do a very poor job explaining how Q-bits are represented &/or manipulated. I'd say a good teacher can do a pretty good job at explaining anything they know,... But if your student is left w/ more questions than answers,... "uh,... ???"

[@bethclemensen2102]

Oddly enough Quantum Computers sound very similar to some Buddhist parables, where thinking you know the answer is not "Buddha nature". The acceptance of all sides of an ethical issue, or acceptance that there is no fundamental absolutely "right" answer is the definition of "Buddha nature". BTW, I'm a Christian within the teachings of Martin Luther (a "Lutheran") but Buddhism can be defined as a philosophy, not a religion,. A Buddhist Lutheran?

[@angellittleton8901]

Sounds like we're destroying ourselves in the name of science.

[@CurfewCopsX]

Thanks man, simple and best explanation so far

[@arashchitgar7445]

The best explanation so far. BUT, the part I steel do not get is the Grover part which I'm gonna watch videos about it. Thank you for the explanation.

[@lenguamuerto]

ok, simple enough, but how's the grover operator for dummies work?

[@rustysmith3565]

Nice try but i still don't get it. It might be me that's a bit stupid LOL.

[@dailyenglishphrases461]

I can not agree, if stupids understand just one thing they think the task was completed they dont cate about details.. but intelligent people usually say I dont understand because they want to know all details and no obscurness

[@govindaneupane]

Amazing information from great profermor ! Thanks a lot Sean

[@MrLeighman]

The best answers are usually the simplest: this is the best description of quantum computers I have come across and I have examined quite a few, let me tell you. Thanks (Subscribed)

[@MountThor]

You've not really explained anything Sean Ong, you just punted the "magic quantum" solving onto the "grover operator". Unless you explain how a problem can be solved you're just making the same "magical" claims about quantum computers. Get into the nitty gritty details please. For example how would a quantum comptuer know what the four bit, 0000 through 1111, password is? Without knowing anything about the password other than the four bits you can't know which of those 16 possibilities is the password. How would a quantum comptuer know the contents of the server's memory that stores the password? See the problem with your example now? It would be really nice to see a real example using just six or eight qbits compared with a real program of a classical comptuer used in a video in such a way as to not rely upon the leap of quantum magic faith. Explaining a concept, which your video does very well, isn't the same as explaining how it works.

[@MrLeighman]

Traditional computers take each input number and compare to the computers memory to get a match. This takes a long time because each possible combination has to be tested. Quantum computers are able to input a landscape of numbers rather than individual numbers. So the number you are comparing to stored memory is always there, you just need to strip away all the wrong answers. As an analogy: Imagine you have a magical quantum key, that you place into a lock, the lock impresses the key code onto the magical quantum key and so now the key is the correct key therefore it unlocks the lock. The key to this( no pun intended) is knowing that the solution to a problem is always in the quantum number, now all you have to do is collapse the function to reveal the correct answer, the correct answer is impressed by the very solution you are looking for. Now thats the way I see it, not sure how physically this would happen in a quantum computer though?

[@joannewilson6577]

in a quantum computer you cannot use the same algorithms that a classical computer use;you have a lot of restrictions at that level;so don't expect a solution to the same large universal problems.

[@etsonguerrero5131]

In addition, it seems that the problems will need a combination of both, Quantum and "Normal" computing. The cryptography example may be one of those cases where you do all the calculations in a Quantum machine, but the end system or the attacked system will be a Normal computer...

[@sTeVe-vl3nh]

Imagine a Labyrinth with 16 possible ways. One gets out. Instead of one person walking the 16 ways one after the other, you have 16 persons that walk all possible ways. One of them will have the right way on the first try. After that, the wrong possibilities can be sortened out.

[@hotfrm]

Ah give the guy a break! He done good.

[@willysatrionugroho8086]

Thank God. Finally,.... A New Prophet Come. Sean "The Messiah" !

[@byteappple]

Wow! I loved this video! great work Sean, thanks.

[@BeautifulGav]

best explanation my brain can understand I have found to date. The entire "super position" idea had me flummoxed. Every friggin simple description just used the term and pretended I had a clue what it meant.

[@daeth4us]

Not sure this artificial intelligence is a good thing!

[@nihilistcentraluk442]

Quantum computing should be able to replicate the workings of the brains 86 billion neurons. Algorithms should be learn through exposure to all human information. Within a short time it would be impossible to tell if you were talking to a machine or a computer. We would be redundant

[@user-tc3sh9pl4e]

If the quantum computer can crack any existing encryption, that is a problem.

[@nareshramini1796]

And it can make strong encryption to replace the current encryption... It also checks for strongest possible encryption with its same quantum power!

[@youneselhamss2908]

You are literally the GOAT! I feel like a genius after watching this video. Now if you'll excuse me I will go do a TED talk on this subject.

[@the_matchless]

Very nicely attempted. Now I am a little more eased with the idea. 👍🏼

[@No-un1ei]

It doesn’t even sound like you know what you’re talking about

[@BLUFFIRL]

He doesn't, he just puts on a fake nerdy voice so he can get views

[@devulapallyswetha124]

Thank you for making a video.. I was understanding clearly..

[@Gratitude999]

Amazing 👌 thank you so much for your wonderful explanation ❤️

[@tombyrne3145]

Great start! The coin toss analogy was terrific. But now need to understand the Grover piece.

[@honda412000]

Congratulations...you were clear as crystal. Thank you.

[@nadzramdass9562]

This is truly the best explanation. Thanks

[@KrachBone]

thanks!! great video it’s old but still gave me a great understanding

[@deltaforce3329]

Thank you Sir !! You are The best

[@yangzhenjen3985]

The best explanation on the internet. The sweeping part to get the one correct answer need more clarification

[@nickkabs6815]

Wooowww ... what a great explanation. Thanx a lot. U are the best teacher ever..

[@sasimaadavanrameshbabu2948]

Probably the best and the simplest resource on the internet aboout qunatum computers. You nailed it buddy!!!!!!

[@MahdiBanners]

Great video, thank you for the easy explanation

[@sujathag-rv2ct]

thank you sir, this is the best explanation

[@RamanYadavRomy]

Wow pretty well explained...now i clearly get the idea of Quantum computer and what is the concept behind it.

[@maheshyadav993]

I now understand what you said. Really short and amazing video. I am subscribing. Hope you tell me about Grover operator that remove wrong answers.

[@anthonywerrett7745]

thanks Sean you have cleared a lot of Quantum fog out of my head still a lot in there though cant wait to learn more about this stuff