Quantum Key Distribution, BB84 - simply explained | Quantum 1x1
Channel: TüftelLab
Date: 2022-05-03

Our cell phones and computers are constantly sending and receiving information. To ensure that only the right recipients can read this information, it is encrypted. But we have to agree on a key beforehand. And how are we supposed to know that there isn't already someone listening in or reading along? 
Exactly for this there is an ingenious trick, the quantum key exchange (QKD - #QuantumKeyDistribution). With it, we can create a key together, and can test whether someone has been eavesdropping. Instead of mathematical riddles, it is based on the exchange of photons. Since they have to obey the laws of physics, and so do we, the process is considered unbreakable. By the way, the method is called BB84 protocol and belongs to quantum cryptography, or quantum encryption. (#QuantumCryptography, #QuantumEncryption)

00:00 Why a quantum key exchange? - an example
00:51 Photons, polarization and polarization filters
02:14 Quantum key exchange (QKD).
02:56 An attacker (man-in-the-middle)
03:53 Quantum key exchange evaluation

You can also create your own quantum key with our tinkering box Qey-Gen. 
You can find it here: https://tuef.tel/tueftelkurs-quanten-qey-gen
and Luisa and Tobi explain how the Qey-Gen looks and works here: https://youtu.be/TWcW4k5ACaY 
Build it yourself or have a look in our store: tuef.tel/shop

__________ The Quantum 1x1 __________ 

Quantum technologies? Already heard of it, but what is it exactly? What is #superposition? How does #quantum cryptography work? And what is a quantum anyway? For our project #Quantum 1x1 we have been busy making explanatory videos and developing new boxes! This will give you an easy-to-understand insight into the future topic of quantum, learn what experts in the field are working on and you can experiment and try it out yourself! https://tueftellab.de/quanten-und-ki/

__________  About the channel __________ 

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