# Why is quantum internet superior to post-quantum cryptography

Many groups all over the world are putting in a lot of effort to build the quantum internet. But why do we spend so much time researching, for example, quantum repeaters and quantum-key distribution (QKD) protocols towards this quantum internet, when we appear to have a suitable alternative: post-quantum cryptography?

As professor Stephanie Wehner explains in this video, there is one crucial difference between post-quantum cryptography and QKD protocols using the Quantum Internet. Ultimately one method can improve the other.

## Prerequisite knowledge

- Quantum-key distribution (QKD)
- Post-quantum cryptography
- Public key distribution

## Further thinking

In the video, professor Wehner mainly addresses the use of quantum repeaters and the Quantum Internet towards secure communication. Can you think of another use case of the Quantum Internet, thus giving another argument why research into quantum repeaters is valid?

## Further reading

Read more about the difference between quantum-key-distribution (QKD) and post-quantum cryptography in this infographic: