If we’re building computers that deal with qubits, superposition and entanglement, wouldn’t these computers also need some way to send qubits to each other? This is the dream of the quantum internet: a network that exchanges quantum-mechanical photons between devices all around the world, parallel to our well-known ‘classical’ internet. 

Anyone who wants to understand the impact of quantum computers, will need to know their basics of cryptography. So let’s start at the beginning.

In this chapter, we take a high-level business perspective at quantum computing hardware. What should you know when starting your quantum journey?