Quantum Computing - what is it?

We use "quantum computing" as a generalization for IT and communication systems, which are not based on binary logic, but instead use effects of quantum mechanics in some way. The physics behind this are considered to be complicated and often counter-intuitive. The quantum mechanics exist in parallel to classical physics from Newton to Einstein. Both approaches are conclusive within themselves, but so far no theory exists to combine them elegantly.

The Hype	The Reality
Quantum computing changes everything! AI will rule them all! Google has already proven quantum supremacy! Everybody can use quantum computers through the cloud!	Quantum computing has made impressive progress. Generally usable quantum computers are still in their infancy. Google's prove of "Quantum Supremacy" has only a theoretical value. For specialized applications (e. g. optimization) specialized hardware exists that uses true quantum effects (Quantum Annealing). Other chips use traditional hardware, but use inspiration from quantum effects (Digital Annealing). The current computational power of quantum computers are still some magnitudes (by a factor of 10,000 to 1,000,000) below what's required for real-world-use, e. g. optimization.

The Hype

The Reality

Quantum computing changes everything!

AI will rule them all!

Google has already proven quantum supremacy!

Everybody can use quantum computers through the cloud!

Quantum computing has made impressive progress.
Generally usable quantum computers are still in their infancy.
Google's prove of "Quantum Supremacy" has only a theoretical value.
For specialized applications (e. g. optimization) specialized hardware exists that uses true quantum effects (Quantum Annealing). Other chips use traditional hardware, but use inspiration from quantum effects (Digital Annealing).
The current computational power of quantum computers are still some magnitudes (by a factor of 10,000 to 1,000,000) below what's required for real-world-use, e. g. optimization.