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Quantum Internet

01 /How to secure communication 02 /Introduction to the Quantum Internet 03 /Quantum Internet: road-map, labs and protocols 04 /What is a Quantum Internet? 05 /Tasks for a quantum internet 06 /Applications of a Quantum Internet 07 /Quantum Key Distribution using BB84 08 /Quantum Teleportation 09 /Blind Quantum Computing 10 /Distributed Systems 11 /Elements of a Quantum Internet 12 /Why is quantum internet superior to post-quantum cryptography 13 /Repeaters 14 /Why making quantum repeaters is hard 15 /Introducing entanglement distillation

Why making quantum repeaters is hard

Current state-of-the-art devices allow for a quantum connection of up to about 100km. Going further than that becomes exponentially more challenging, and we need some workaround to create a quantum network over larger distances. One of those workarounds is trusted repeaters, which have already been constructed in practice. Quantum repeaters would be even better, but those are very hard actually to make! In this video, David Elkouss gives an overview of what all these things are and why they are so hard.

 

Prerequisite knowledge

Further thinking

We can describe a lot of the procedures and principles described above as quantum circuits.

  1. What would the ‘entanglement swap’ performed by a quantum repeater look like as a circuit?
  2. How could we deal with the noise that might be added by the communication channel?
  3. What would entanglement distillation look like as a circuit?

Solution

Further reading