PhD student explains Quantum Communications

[@sinousty]

SUPERB explanation and easy to follow for "layman" ;)) Thank You !

[@geoffplywood6112]

The government wouldn’t let consumers have genuinely secure communications

[@ryanmckenna2047]

That is an excellent point.

[@anajardimbr]

Great explanation about the importance of quantum communications and privacy.🎉🎉🎉🎉

[@YoRock1976]

Interesting concept, but doesn’t the very act of Bob’s viewing the photon, or anyone else for that matter, change it from a particle to a wave? I don’t understand the mechanism that would make the transfer of data immutable.

[@ralffig3297]

Yeah lots of pipes but we don't know if it works or not.😊

[@anakagung7613]

this is how the Sophon on the 3-body problem suppose to work

[@lepidoptera9337]

That's just a stupid plot device that violates all laws of physics.

[@haistapaska20]

Who is this researcher?

[@leucemidus]

Como es que Bob sabía como era antes, como para decir que verdaderamente cambio?

[@Odog78]

Interesting... So QMC is presented as more of an encryption hash than a FTL communication method? My mind hurts....

[@lepidoptera9337]

There is no FTL. One can use quantum mechanics for encryption but it is not nearly as secure as she says. The devil is in the detail, unfortunately.

[@vengeance5020]

Wowwwwww..... This is interesting, I just clicked the video out of boredom but it was an interesting one

[@SpaceportChapter]

🔸🌊 Quantum entanglement 🔸🤺✨

[@jbkrobin]

I don’t understand why distance would be a problem? Is it because of noise?

[@venkatabhignan8410]

When photons travels through a medium it causes losses. Here the fiber optic cable which connects Alice and Bob causes losses.

[@jbkrobin]

@@venkatabhignan8410 So, this losses due to classical communication?

[@lepidoptera9337]

@@jbkrobin It's just classical absorption. A photon is a small amount of energy. Any impurities in the fiber will scatter or absorb that energy and then the signal that we are looking for is lost.

[@grindupBaker]

For the old copper wiring back in the 1960s,70s when I was a computer programmer and did some hardware prototyping it was "parasitic capacitance" that llimited the speed of signals. I was finding the highest speed I could send data at down our cable and it was just 300KHz reliably as I recall. The scope showed voltage building from 0V to 5V over some nanoseconds as a rounded type of voltage rising like a soft shoulder and something like 0.0V to 1.0V is a reliable "1", something like 4.0V to 5.0V a reliable "0". As I increased the rate of the pulse train it was able to make it (by filling the parasitic capacitance) to 5.0, 4.9, ... 4.1, 4.0V before the rising pulse ended and the next drop back to 0.0V occurred. At 300KHz it was only reaching 4.0V and I found that was 100% reliable for being taken as a 5.0V logic "0" so I made 300KHz be the rate that my computer program sent bits down the wiring to communicate with my 100 of 4021 CMOS 8-bit shift registers in the 10 big box contraptions at the other end. It was a parallel-to-serial, 120VAC input parallel-loading instantaneously a gang of 100 of the 4021 CMOS 8-bit shift registers in the 10 big box contraptions (we designed them so you could walk on them up to 300 pounds bloke because they had to be all over the floor in a large floor area in a mechanical room). My Zilog MCZ 1/05 Zilog 80 Assembler program sends a freeze-lock-signal pulse instantaneously to 100 of 4021 CMOS 8-bit shift registers in the 10 big box contraptions, freezing the 120VAC "Hot" or 0V "Cold" state of each 120VAC-powered circuit, simultaneousness of all 800 devices being crucial. Then it clocks out the 800 frozen bits serially to the Zilog MCZ 1/05 computer at 300KHz the maximum speed I found reliably achievable with that low-voltage cable of type & length we used, to guarantee a minimum 4.0V at the Zilog for 5.0V at the remote CMOS 4021 chip. So it sampled 800 of 120VAC circuits simultaneously for "on" or "off" at 300KHz/800 = 375 samples per second rate. The reason why going 4.0-5.0V to 0V wasn't an issue was that it was tied to 0V through 100k Ohm resistor at the Zilog MCZ 1/05 computer end so the remote-device CMOS 4021 chips only ever had to pull it up to at least 4.0V through the cable wiring parasitic capacitance coupled with the 100k Ohm resistor leakage, never needed to force it back to 0V because that was done locally, instantaneous. It did the job. "parasitic capacitance" limited the speed. I did something else similar with RS232C USARTS (+/- 12 volts from 5V / 0V) but geezer memory has faded, it was 2 separate hardware prototyping & computer programming (my expertise) projects in the 1970s.

[@lepidoptera9337]

@@grindupBaker Parasitic capacitance only limits data rates if you are driving that cable with the wrong impedance. You simply didn't know enough electronics to properly terminate and equalize long cables. Today we can send Gbit/s rates over the same cables.

[@MartinMaat]

This doesn't explain anything. Bob has knowledge about a particular state of a photon being sent by Alice? And that is their little secret? We have PKI for that which is well established. So I don't understand what she is on about or how this could be a game changer in security.

[@mrjebiga7540]

the idea is that the "bitstring" changes is "cindy" listens to it. Whereas in a classical system one can read the bitstring and send out the same bitstring. Cindy can not konw what the actual bitstring is, therefor can only send out what cindy measures. This leads to a change in bitstring that bob receives and the data does not make sense. Then they can communicate to change encyption or smth.

[@seenundercygnus6870]

What's the catch? You gotta use really small words.

[@verdipratama]

awesome❤

[@ronaldluning4010]

Sound travels faster and stronger in water than air. Finding a way to communicate through dark matter? Is that what your saying. Advanced extraterrestrial worlds probably have achieved this, which makes me think that planet earth is much louder than the light\ radio waves its been sending out since the '30s.

[@sokka90ml]

Exploiting higher dimensions, faster than light travel and advancing relativity and universe structures maybe they have achieved

[@ronaldluning4010]

@@sokka90ml fairly sure we reside in higher dimensions but are too stupid to realise it.

[@ItzD4nte]

She's a cutie

[@abdullah.al.noman.z]

7III7IID

[@fluffykitties9020]

word salad.

[@marktoffoli9186]

Say more

[@borninvincible]

Say you don't read without saying you don't read 😂

[@nosouponhead]

This sounds like utter rubbish.

[@marktoffoli9186]

Say more

[@Chimken_nunget]

It’s already being used by some governments and companies for short distance channels. China and the US are both working on implementing this with satellites

[@borninvincible]

Then you should spend more time in the library 😂