## 2 Theoretical Background
### Quantum Information as an Attractive Life Plan for the Development of Quantum Industry  
The boom in quantum information development has been sparked by its perceived potential impact on human society and the undeniable boost that the Internet has provided through scientific dissemination to everyone using their devices. The Internet has generated an intangible impulse for scientific development in the last 25 years, attracting and involving new human resources in research [12].  
After decades of theoretical and experimental work, quantum technologies are a reality, currently crossing a period of emerging growth in a well-identified global industry. Although the most notable goal is the creation of a quantum processing device emulating and improving the capabilities of current computing technologies, other developments are proceeding from different fronts, including quantum processing algorithms, user interfaces with these technologies, the development of quantum sensors, and the associated metrology to measure related systems [13]. These are commonly classified into three significant developments, computing and simulations, communication and networks, and quantum sensors and measurements. Blocks of countries in North America, Europe, and Asia, have detailed medium-term strategies, roadmaps, and prioritized investments in those technologies as a line of economic development [14].  
As a result, the quantum industry is growing exponentially, transitioning from quantum mechanics, as noted in several prospective references [3; 7; 14; 15]. Figure 2 schematically shows the exponential growth as a function of time, estimated by research discovery facts and data. The color code marks three different, well-stated developmental stages of that industry. The horizontal axis divides the quantum revolution since its dawn in 1900 (with the [PERSON] hypothesis of quanta) as the beginning of quantum science (blue), going through the era of electronics with the development of the semiconductors around the 1960s marking the beginning of the quantum technology stage (orange). Then, the beginning of the quantum industry era (green) was marked by the first commercial quantum computer available, the D-Wave, and 2030 is a planned horizon in the roadmaps of several countries blocks [3]. Vertical legends refer to applications that appeared or are expected to appear in each stage [3; 7; 14; 15]. The vertical axis indicates the number of quantum scientists involved in the field; mainly, the number of new employments related to quantum information in the current decade ranges in the tens of thousands yearly [16]. Otherwise, the leading global industries currently have employees ranging in the millions [17]. Those values barely set the number of people involved for each stage of the vertical axis, especially for the quantum industry.  
Thus, by surpassing the theoretical and basic experimentation of the last century, quantum science is evolving first in the current intermediate stage of quantum technologies to arrive in the following decades in a global industry of quantum applications [15]. In the future, several applications are expected to be developed involving an increasing number of professionals [18].