Very good explanation of QKD! The use of photon polarization in these protocols is called a Discrete Variable QKD, it has some downsides like requiring very good single-photon detectors, so nowadays there's a lot of research on Continuous Variable QKD (CV-QKD), which can use the very Electric Field of the signal as the quantum variable, the best part is that it's been shown to work on regular telecommunication devices, which is much more attractive for companies. I did some research in this field and it does seem like a complete CV-QKD system is almost achieved, the major problem is the speed, which is much slower than conventional communication due to the high complexity of the reconciliation protocols.

hooray! another IM video! I’ve been eagerly awaiting it.

the kind of video I have to watch again over a few weeks/months, I've missed that so thank you sir.

I don't think I could afford to pay you for that 20 part course in QM, and at 63 my mind wanders, but I'm very, very glad it wandered onto this channel, thanks!

He has returned to drop another nugget of knowledge upon us!

Perfectly put, thank you so much

This video is so powerful. Keep up the good work!

Highest quality content. Thank you !

Wouldn’t this mean that you’re limited to the distance of a single fiber optic? If all the security comes from not being able to clone the photons, no repeaters are possible, the best you can hope for is connecting to an intermediate node and form a sort of “chain” of nodes that go from one end to the other. But now every single one of these nodes is a critical part of your security. Given that the threat to current technology (Quantum Computers) are nowhere near what they’d need to be an actual threat, this looks like a great source for academic papers with very little practical benefit.

I have a couple of quesitons: 1.Is this type of encryption theoretically unbreakable? 2.When the satellite recorded the signal sent to it by China, shouldn't that signal be stored in the satellite's memory, a memory that can be read. Thanks!

Method is very flimsy for practical use, a eavesdropper can make the network unusable by just reading the bits unlike in classical networks where eavesdropper can read data but it will remain untouched, so the communication can work even if there is passive snooping going on which is the most way of eavesdropping, yes active snopping will have same effect as passive snooping in quantum secured network but its very rare as you need more privileges to do it.

What is the software you are using for creating this content like the animation and white-broad?

In the E91 method, how do the photons get entangled in the first place?

Sorry but this is quite confusing at 8:15 , why on earth will bob receive a diagonal to right photon, if the one sent by the eavesdropper is vertical, surely he should receive a vertical photon sent by the eavesdropper?

If a quantum internet is required doesn't that mean, that one would have to have one dedicated fiber optics connection between every single receiver? so for a few actors, that would be possible, but even just for every country a connection to every other country would be [assuming 200 countries and if im not wrong this should be combination statistics = 200!/(2!*(200-2)!) ] 19900 connections. this seems impractical. Or am i missing something?

New IP video and I drop everything!!

Wouldn’t the atmosphere or molecules in a fibre optic cable mess up the superposition?

BB84 (7:00) basis exchange ONLY AFTER information bit HAD BEEN sent... even if both knew their basis ahead of transmission. ( just my 2c.. no expert.. I first confused with thought what if middle man got all those basis and measure it... but then there is nothing to measure since all photons had been sent... maybe I am just slow learner.. lol) .. great explanation... I knew nothing before .. now a little.. lol

Hey @imporable matter, will u do a sparc video in the future ? I saw it had a Q of 11 but I'm not a fusion scientist so I came here

Could we get a future video about public key encryption?

One thing i don't understand is to how change our internet etc into photon based

Detecting an evesdropper feels a bit... secondary. I want to know no one can evesdrop. Not whether someone did. I want to aim to send a 100% secret message and have both parties know for sure its from each of us. But without needing to reprove identity frequently.

Looks like someone is a fan of cartoon shows 😄1:58

So when they got them wrong but nobody was listening, wuold they think someone was listening?

Hell yhea new video

Fiber optic would not affect Because if it did the Internet we shut down

This might seem a silly idea for a video, but I was too young to understand the craze that happened surrounding the concept of Cold Fusion. Could you explain what they hell it was, and how it would have supposedly worked. I don't personally believe such a thing could exist , but trying to read into it and understand why it received so much backlash is a nightmare to unpack that I just can't make any sense of.

9:05 the Chinese satellite MICIUS sends entangled photons.

11:15

How the hell do you have 194 visualisations, 2 comments and 34k+ likes???? Edit: in all your videos you have exactly 34.060 likes?? What is going on here?

Just noticed you have 34.060 likes in the latest video. Is this some youtube bs?

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