# Quantum Computing

Last updated

Last updated

Classical computers work with *bits* of information. At the most atomic level there is something that is true or false, 1 or 0, black or white.

Quantum computers on the other hand take advantage of phenomena in quantum physics and work with *qubits*. There are 0 and 1 and everything in between.

They allow applications where instead of doing a calculation for for a large number of possibilities one after the other the calculation is done for all possible inputs all at once.

This is a great explainer from 2016

π https://youtu.be/LP__QwGZScg

Quantum Supremacy

The term quantum supremacy means a point in time where quantum computers have reached a point that they can do a calculation significantly faster than even the biggest baddest super computer could.

So far Google and the University of Science and Technology of China have claimed to reach quantum supremacy.

π Google: Demonstrating Quantum Supremacy

Applications

so what is this super fast computing good for?

cryptography

quantum computers will be capable to break most of today's encryption

search problems

simulation of quantum systems in particular for material science , drug discovery, genomics

machine learning

in other words, it will allow new levels of achievements in several emerging technologies:

Artificial Intelligence

3D Printing AKA additive manufacturing

synthetic biology

Will it replace "normal" computers?

Don't expect everyone to replace their PC or Mac with quantum computers. Classical 0-1, true or false binary computers will co-exist with quantum computing. Each has its own use and benefits.

Quantum Internet

The same way how early mainframes were connected with computer networks that grew to become the Internet there is ongoing work and research to transmit information in the form of qubits connecting quantum computers.

One application is *secure communications* that is physically guaranteed to remain private.

Get Hands On

Cloud providers now each allow people to access quantum computers