# What are quantum technologies?

“Quantum technologies” is a name for all the methods used to produce tools, the functioning principle of which is essentially based on one of the following quantum properties: The quantum superposition of states of a physical object, or the quantum entanglement of several subparts of that object.

### QUANTUM TECHNOLOGIES IN BRIEF

Technologies involving quantum superpositions of states and/or entangled states of various physical systems are numerous. They can be classified by the type of quantum object they are built on: quantum optics systems involving photons (light particles) trapped in cavities or propagating in vacuum or optical fibers, systems with room temperature or cold atoms, systems of electromagnetically trapped ions, systems involving electronic or nuclear spins, or systems based on superconducting quantum circuits or mechanical oscillators.

Within SIRTEQ, quantum technologies are classified into four applicative domains: (1) the field of “quantum sensors and metrology“, with for example, atomic clocks of GPS satellites or atomic quantum gravimeters to probe the underground with unsurpassed sensitivity; 2) The field of “quantum simulators“, able of modelling in a pure and controlled way the behavior of quantum systems that cannot be calculated; 3) the fields of “quantum communications” allowing, for example, the inviolability of information communicated along optical fibers; 4) Finally, the field of “quantum computing” which should lead to computers able to perform certain calculations much more efficiently than with our current computers.