This is one of the most illuminating and inspiraitonal videos on quantum computing. Mr. Sank seems so passionate about the subject and excited to share the knowledge with people who would like to know the fundamentals of quantum computing. Thank you~
I’m an electronics technician not an engineer, so this is definitely the most easy to understand video I’ve seen on quantum computers. I’m assuming one day , Q computer technicians will be needed so I’m trying to get a basic grasp of it. My question is - how many computations does the computer perform before an accurate answer can be obtained using probability?
I'm still confused how logical operations are performed and the results observed. A good amount of time of this video was spent focusing on explaining the protection the qubit circuitry from any interference, even so much as a photon, but then it was said that logic operations are sent to the qubits for processing, and no explanation was given. (1) How are the logic operations sent to the qubits for processing without changing the qubits into an unknown state? (2) And how are the results observed without altering the answer? Observation involves interaction with the qubit, even if it is so much as a photon or a very sensitive electromagnetic field sensor that responds by sending out a signal (which itself generates a new electromagnetic field), and if the qubits are supposed to be protected from such things, how are answers observed?
Had to keep it to around ten minutes and couldn't cover everything. We'll get to control and readout at some point. But in short: single qubit controls are microwave frequency pulses for bit flips and lower frequency pulses for frequency shifts. Readout is a bit more complicated and is described in publicly published literature, but for a pedagogical discussion you could try my PhD thesis: web.physics.ucsb.edu/~martinisgroup/theses/Sank2014.pdf
For (1): There are microwave generators that send microwave pulses down control lines connected to the qubits. Different pulses have different effects, and within the set of possible effects there are quantum gates such as the Hadamard gate. Quantum computation is basically just the application of a series of known gates in a specified order, so in principle these pulses are sufficient to perform any computation. In practice there is sufficient noise that the computations are still limited to short times; for very long running computations error correcting codes such as the surface code will be needed. For (2): In the simplest case, measurement always comes at the end of the computation. So it doesn't matter that you've caused damage that would prevent the computation from being continued further. In more complicated cases, you need to be careful to measure only the bare minimum of what you need and leave everything else unaffected.
2:57 Shouldn't the red arrow from (000,101) leads to (101,000) not (100,000), just as blue arrow (000, 100) leads to (100,000)? Sorry for my lack of location notation, but i hope you understand my question.
How noise can be reduced by Quatumcomputing, perhaps through using ledsignals by transmition of qubits. Just a thought Thanks for explanation and kind regards.
Thanks, Great job I have two questions: do you only keep the two lowest energy states for the qubits to keep superposition of two states ? If yes how do you prevent an aggregate of atoms from going to higher energy states ? If no this means that one bit can be represented by the vector [0,…,1,…,0] (with one on the active energy state the system collapsed to) once measured, could you point some material to know how to build circuits like addition multiplication with such vectors ?
This video was excellent. I can say that I have a very basic understanding of quantum computers. How can we observe superposition without changing it? Due to the cooling?
I don't think we observe superposition. I believe we infer superposition. An example is the double slit experiment where sending individual electrons through the slits creates an intereference pattern on the screen behind. (same as what happens with coherent light shining on the double slits) So we say the electron path is s superposition of the path through the right slit and the left slit. My 2 cents.
Thanks for the video Daniel, If I got it well, you are proposing a new chip (8 times colder than space) simulating the operations of Cryostat. The superposition is ensured by the Superconductivity at steady rate, but we could have some errors. My questions: Does this chip also manipulate true electrons inside for the superposition states (as the Cryostat), or States are hardcoded in the simulation? Is it possible to use this chip to create small quantum computers (like PCs) and make them available for the public? Correct me if I made a mistake, please.
I was hoping for something that goes into the physical representation of qubits in a bit more detail, more youtube vids here I go. Unlike suggested by the diagram at th-cam.com/video/uPw9nkJAwDY/w-d-xo.html the energy levels between 0 and 1 and 1 and 2 are not the same, and that is important because we don't want it to go to level 2 when we add energy, we only want 0 and 1, see e.g. th-cam.com/video/t5nxusm_Umk/w-d-xo.html
Amazing video! thank you! well explained. I think its great to learn more about how errors get produced! We should have a think tank for the subject. Qubit fab is the future. I can't wait to hear more from the team regarding its progress. Also what classes / degrees are required to get into this type of work?
Micro-fab begin folding those metals atleast 22 times like a samurai sword as to remove imperfections, or ions (slag). If their ions are removed the q-bit won't have opportunity to flip. If I understand correctly you just want clean electricity to flow through no hurdles & aren't their water cooled computers.?. Tie that in some how. LoL I know nothing just really curious how it all works. I do electrical work (shade tree electrician) but point I guess like from transmission lines to service lines into the services of a house to an AC adaptor to a circuit board to services of what ever using. Accept dirty electricity exist & that's what I feel your saying you have to remove, and I also think your guys cryostats are cool. Like really really cool.
Cool video, thanks! Would be great to know more about the current challenges you guys are facing, maybe in a follow-up? Also would be really interesting to see a lab tour type of video. You mentioned improving the superconducting material purity - is that a part of the research you do? So it's not just software / hardware development, it's also material science and physics? Sounds very interesting.
Yes, materials science, fabrication methods, and the associated physics is critical to our field. Regarding follow-up videos going into more depth on the challenges we're working on: that's exactly what I had in mind when scripting this video. I wanted to bridge from the computer science concepts to the hardware so that in future videos we can talk about how logic gates work and what kinds of things go wrong on the physical level. I recently got permission to release a slide presentation that may be helpful: docs.google.com/presentation/d/1UsXVoqzu9rnpwiC3nN7YVG2YA9mvHgM84KH_JMXwFJE/edit?usp=sharing
Why can't we make a quantum cube which doesn't interact with the other particles? Instead of a flat chip, we can make a closed cube inside which qubits are built.
HERE IS THE BIGGEST LIE: 8:13 "RELATIVELY STANDARD COMMERCIAL PRODUCTS", hahaha. THEY ARE SO STANDARD THAT, SO FAR, NOBODY HAS COME UP WITH ANYTHING USEFUL.
This is definitely the MOST INFORMATIVE video on Quantum Computing basics. Thanks a lot Mr Sanks......also kudos to Sergio for such an amazing push
Wow. Incredibly well explained with subtitles in multiple languages. Please keep up this great work!!!
This is my favorite vídeo series right now. Please more episodes :)
BU zamana kadar dinlediğim en açıklayıcı bir video olmuş. Teşekkürler
This is one of the most illuminating and inspiraitonal videos on quantum computing. Mr. Sank seems so passionate about the subject and excited to share the knowledge with people who would like to know the fundamentals of quantum computing. Thank you~
Not easy concepts to explain but good video
I’m an electronics technician not an engineer, so this is definitely the most easy to understand video I’ve seen on quantum computers. I’m assuming one day , Q computer technicians will be needed so I’m trying to get a basic grasp of it.
My question is - how many computations does the computer perform before an accurate answer can be obtained using probability?
Best explainnation for quantum vs classical bits
Hello, Worlds!
I'm still confused how logical operations are performed and the results observed. A good amount of time of this video was spent focusing on explaining the protection the qubit circuitry from any interference, even so much as a photon, but then it was said that logic operations are sent to the qubits for processing, and no explanation was given.
(1) How are the logic operations sent to the qubits for processing without changing the qubits into an unknown state?
(2) And how are the results observed without altering the answer? Observation involves interaction with the qubit, even if it is so much as a photon or a very sensitive electromagnetic field sensor that responds by sending out a signal (which itself generates a new electromagnetic field), and if the qubits are supposed to be protected from such things, how are answers observed?
Had to keep it to around ten minutes and couldn't cover everything. We'll get to control and readout at some point. But in short: single qubit controls are microwave frequency pulses for bit flips and lower frequency pulses for frequency shifts. Readout is a bit more complicated and is described in publicly published literature, but for a pedagogical discussion you could try my PhD thesis: web.physics.ucsb.edu/~martinisgroup/theses/Sank2014.pdf
For (1): There are microwave generators that send microwave pulses down control lines connected to the qubits. Different pulses have different effects, and within the set of possible effects there are quantum gates such as the Hadamard gate. Quantum computation is basically just the application of a series of known gates in a specified order, so in principle these pulses are sufficient to perform any computation. In practice there is sufficient noise that the computations are still limited to short times; for very long running computations error correcting codes such as the surface code will be needed.
For (2): In the simplest case, measurement always comes at the end of the computation. So it doesn't matter that you've caused damage that would prevent the computation from being continued further. In more complicated cases, you need to be careful to measure only the bare minimum of what you need and leave everything else unaffected.
@@danielsank5094 thanks :)
Looking forward to next one.
These slides might help: docs.google.com/presentation/d/1UsXVoqzu9rnpwiC3nN7YVG2YA9mvHgM84KH_JMXwFJE/edit?usp=sharing
using quantum gates and microwave pulses.
2:57
Shouldn't the red arrow from (000,101) leads to (101,000) not (100,000), just as blue arrow (000, 100) leads to (100,000)?
Sorry for my lack of location notation, but i hope you understand my question.
9:06 Why can the method of a grid of qubit solve the uncertainty of data?
How noise can be reduced by Quatumcomputing, perhaps through using ledsignals by transmition of qubits. Just a thought
Thanks for explanation and kind regards.
Thanks,
Great job
I have two questions:
do you only keep the two lowest energy states for the qubits to keep superposition of two states ?
If yes how do you prevent an aggregate of atoms from going to higher energy states ? If no this means that one bit can be represented by the vector [0,…,1,…,0] (with one on the active energy state the system collapsed to) once measured, could you point some material to know how to build circuits like addition multiplication with such vectors ?
Wow, amazingly explained
Almost perfect pacing!
When tou have elletrically full guide then you have a porzadek in electrons. The lingual of the guide will also be less to "stack"/ [ordering].
This video was excellent. I can say that I have a very basic understanding of quantum computers. How can we observe superposition without changing it? Due to the cooling?
😊
I don't think we observe superposition. I believe we infer superposition. An example is the double slit experiment where sending individual electrons through the slits creates an intereference pattern on the screen behind. (same as what happens with coherent light shining on the double slits) So we say the electron path is s superposition of the path through the right slit and the left slit. My 2 cents.
0:16 But in order to have a computer, you have to build transistors using semiconductors, which are explained by quantum mechanics.
Thanks for the video Daniel,
If I got it well, you are proposing a new chip (8 times colder than space) simulating the operations of Cryostat. The superposition is ensured by the Superconductivity at steady rate, but we could have some errors.
My questions: Does this chip also manipulate true electrons inside for the superposition states (as the Cryostat), or States are hardcoded in the simulation? Is it possible to use this chip to create small quantum computers (like PCs) and make them available for the public?
Correct me if I made a mistake, please.
Great video! Would be interesting to learn more about the materials science side, fabrication methods, and the challenges you face.
Quantum computing change state find photon and matters particles in air it possible ?
Nice work Dan!
How is the software written to perform operations? I guess the system language would be more challenging than a classical computer
That is the subject of one of the upcoming videos in the series.
Good job @daniel sank
I need to learn more about this! How can I come up to speed on the subject?
Great video
I was hoping for something that goes into the physical representation of qubits in a bit more detail, more youtube vids here I go.
Unlike suggested by the diagram at th-cam.com/video/uPw9nkJAwDY/w-d-xo.html the energy levels between 0 and 1 and 1 and 2 are not the same, and that is important because we don't want it to go to level 2 when we add energy, we only want 0 and 1, see e.g. th-cam.com/video/t5nxusm_Umk/w-d-xo.html
Amazing video! thank you! well explained. I think its great to learn more about how errors get produced! We should have a think tank for the subject. Qubit fab is the future. I can't wait to hear more from the team regarding its progress. Also what classes / degrees are required to get into this type of work?
Does anyone know if tensorflow 1.12, CUDA 10 and CUDNN 7.4 are all compatible?
Very informative.....!!!!!.
Wheres the french subtitle :(
very compelling intro
Put the components in a vacuum and raise the temperature equal to the one in space you should get almost 0 errors
I have figured out how to make a virtual quantum superposition on mindustry, im not lying
Micro-fab begin folding those metals atleast 22 times like a samurai sword as to remove imperfections, or ions (slag). If their ions are removed the q-bit won't have opportunity to flip. If I understand correctly you just want clean electricity to flow through no hurdles & aren't their water cooled computers.?. Tie that in some how. LoL I know nothing just really curious how it all works. I do electrical work (shade tree electrician) but point I guess like from transmission lines to service lines into the services of a house to an AC adaptor to a circuit board to services of what ever using. Accept dirty electricity exist & that's what I feel your saying you have to remove, and I also think your guys cryostats are cool. Like really really cool.
Cool vid
Cool video, thanks! Would be great to know more about the current challenges you guys are facing, maybe in a follow-up? Also would be really interesting to see a lab tour type of video. You mentioned improving the superconducting material purity - is that a part of the research you do? So it's not just software / hardware development, it's also material science and physics? Sounds very interesting.
Yes, materials science, fabrication methods, and the associated physics is critical to our field. Regarding follow-up videos going into more depth on the challenges we're working on: that's exactly what I had in mind when scripting this video. I wanted to bridge from the computer science concepts to the hardware so that in future videos we can talk about how logic gates work and what kinds of things go wrong on the physical level. I recently got permission to release a slide presentation that may be helpful: docs.google.com/presentation/d/1UsXVoqzu9rnpwiC3nN7YVG2YA9mvHgM84KH_JMXwFJE/edit?usp=sharing
Is Information physical ? may one day we discover a new set of laws.
Everything is physical
but can it run Crysis? :))
birth place of physical ai nueurons
Refrigeration is very important. If Super cooling system fails, no quantum computers works
5:27 I don't think it's a good idea to talk about "observing" and "nature observing". It gives space to many pseudosciences.
😊
me watching this so i can make a q gaming laptop
I hope you can actually build one physically not just show slides like everyone else
Why can't we make a quantum cube which doesn't interact with the other particles? Instead of a flat chip, we can make a closed cube inside which qubits are built.
Can a quantum computer predict my thoughts before I think them, eventually?
GOOGLE!
Classical qubit already meet its peak?! #Superconducting qubits then we hit a paradox #Quantum qubits, using it against it self
HERE IS THE BIGGEST LIE: 8:13 "RELATIVELY STANDARD COMMERCIAL PRODUCTS", hahaha.
THEY ARE SO STANDARD THAT, SO FAR, NOBODY HAS COME UP WITH ANYTHING USEFUL.
nvidia and intel dead it seems