**8. The architecture of quantum computer**

Architecture can be seen as a blueprint. The architecture of the quantum computer is a combination of classical and quantum parts and can be divided into 5 layers where each layer is represented as the functional part of the computer (**Figure 1**).


#### **Figure 1.**

*The architecture of a practical quantum computer. It can be divided into five layers, each performing different types of processing [12].*

#### *Introduction to Quantum Computing DOI: http://dx.doi.org/10.5772/intechopen.94103*


**Quantum Processing Unit (QPU)** is made up of three layers including the digital processing layer, analog processing layer, and quantum processing layer. QPU and classical layer together constitute the Quantum Computer. Digital and Analog layers operate at room temperature.
