Quantum technology is a class of technology that works by using the principles of quantum mechanics (the physics of sub-atomic particles), including quantum entanglement and quantum superposition.
A very common type of Quantum Technology is your Smartphone. Its semiconductors use quantum physics to work.
Quantum computers are the ultimate quantum network, and are devices that can store and process quantum data (as opposed to binary data) with links that can transfer quantum information between ‘quantum bits’ or ‘qubits’.
The entire face of technology can be changed by Quantum Mechanics. From devices as large as Computers powering spaceships and satellites, to nanotech sensors and probes.
Nanotech devices that would be entirely capable of changing any substance at the sub-atomic level.
Ordinary computers perform calculations using “bits” of information, which, like on-and-off switches, can exist in only two states: either 1 or 0. Quantum computers use quantum bits, or “qubits,” which can exist as both 1 and 0 simultaneously.
Quantum Computers make cracking any encryption as easy as pushing a button.
But just like they make decryption easy, any encryption being run by a Quantum Computer is virtually impossible to crack given that a Quantum Computer processes and adapts to any attempt made by the hacker or the other machine trying to decrypt.
Quantum Computers can run a program, while simultaneously run and calculate all the probabilities and possibilities of its decryption and adapt new methods to prevent any unauthorized access in infinite different ways.
Quantum Computers operate under extreme cold, at temperatures near absolute zero. For the IBM quantum computer, for example, the temperature is 0.015 Kelvin. Such low temperatures can only be achieved by cooling down the chip with the help of liquefied helium.
Google announced it has a quantum computer that is 100 million times faster than any classical computer in its lab. Every day, it produces 2.5 exabytes of data. That number is equivalent to the content on 5 million laptops.
A particular problem that would take the most powerful Supercomputer over 10,000 years to solve, a Quantum Computer would be able to solve the same problem in a matter of seconds.
Problems like; 1000 Queens, P versus NP, etc.