Close

Filter courses

Level
Show courses Show filters
Close

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

Elements of a Quantum Internet

Building a quantum internet is not as simple as just connecting two quantum computers.

Imagine for a second a quantum key distribution (QKD) system based on photons: one of the nodes sends a quantum state encoded in a photon, and the other, after some time, receives it and measures it in any of the basis. However, due to decoherence of the qubits, the state that was sent initially might not be the same as the one that's received, affecting the communication and performance of the protocol. It has been tested and simulated that for a QKD system, more than 100km is fatal for the communication rate. How can we circumvent these issues? Especially if we want to move further to more complicated protocols?

In the video, the basic blocks needed for a quantum network are explained, with emphasis on the communication channels, quantum repeaters, and introducing the concept of entanglement distillation.

Prerequisite knowledge

Further thinking

Suppose we are just sending photons (light) using optical fibers, just the same way we do so for classical internet. Why can't why use the same repeaters as well? 

Solution

Further reading