Quantum Computer: What is it? How Does it Work?

Already from this precise moment it is glimpsed that the computers of the future will be quantum computers , since the largest technology companies in the world such as Microsoft, Google, Intel or IBM are working on projects of this type, and even the latter has already launched quantum computer models quite successfully. What is Quantum Computing and How Does it Work do quantum computers exist

What are quantum technologies?

As we know, during its evolution, Humanity was developing its technology and science based on its needs and on how it understood the behavior and functioning of the nature that surrounded it. As history passed, technology evolved and with it also opened a door to new challenges derived from those discoveries. do quantum computers exist

INTERESTING: History of Computer Technology

At this very point we are before one of those doors, whose key is quantum computing, a technology that is based on the manipulation of the smallest elements of the physical world to form them, put them on track and do what we want. An incredibly complex task that, however, is already working for us, and evolving with each passing minute. what is quantum computing and how does it work do quantum computers exist

Many other different technologies derive from the quantum world , called “Quantum Technologies”, which are basically defined by having quantum properties of a subatomic nature such as quantum superposition and quantum entanglement as a basis. Among them quantum computing, the one that concerns us in this article.

In this sense, we must understand that the first ideas about quantum technologies occurred between the first years of the 20th century, more specifically between the years 1900 and 1930, when the studies carried out on some physical phenomena that were not yet fully understood gave space to a new perspective: Quantum Mechanics. what is quantum computing and how does it work

More specifically, the origins of quantum mechanics date back to 1925, when Edwin Schrödinger developed the wave equation, which describes the temporal evolution of a quantum particle. do quantum computers exist

In basic form, this quantum mechanics describes what happens in the world of molecules, atoms and electrons, and due to these studies and theories not only could these unknown phenomena be explained, but also a door was opened to a subatomic world that it was necessary to understand to take advantage.

Thanks to the fact that we were able to understand the functioning of this microscopic world of molecules, atoms and electrons through Quantum Mechanics and the technologies derived from it, it allowed us to have a much broader panorama than we used to have, and made it easier for us to improve The way of life of all Humanity, such as the transistor, a fundamental electronic component for the development of processors and microprocessors that allowed our devices to be smaller, stable and safer, was possible thanks to being able to understand how electrons behave in conductive and semiconductor materials. do quantum computers exist

Another more than clear example of how quantum mechanics is the origin of many of the technologies that we enjoy today is the Laser, which would not be possible without Albert Einstein laying the foundations of stimulated emission in 1917, using the theory quantum radiation. what is quantum computing and how does it work

Also as a good example of where quantum theories took us, we can name the SQUID rings, which were presented in 1967 and which are basically sensors that are capable of detecting even the magnetic field of our brain. These work based on the fact that electric current is capable of flowing, without applying any type of voltage, between two superconductors at a short distance , which refers us to magnetoencephalography and various fields in health. do quantum computers exist

Today we are at a point where quantum technologies are taking up more and more space, eventually replacing old digital technologies and leaving them behind forever. what is quantum computing and how does it work

The quantum technologies are used in diverse and broad fields such as quantum simulation , communications, security, quantum computing, the main purpose of this article, the technology of the blockchain, quantum optics, quantum metrology, quantum clocks, quantum sensors, augmented reality and virtual reality, artificial intelligence, IOT, better known as the “Internet of things”, and in an endless number of less spectacular implementations but that will undoubtedly change the way we see things, such as autonomous vehicles, 3D printers, drones and others.

All these technologies derived from quantum laws were designed with the purpose of improving our quality of life, and at a certain point quantum technologies such as quantum computing are destined to combine, thus creating a world that not even in our wildest thoughts we could dream. what is quantum computing and how does it work

To learn more about quantum technologies, it is worth knowing about the origin of quantum computing , and thus be able to navigate this article in the most agile way possible, since later we will find much more information than to understand the everything, we will need to be clear about as many concepts as possible.

Quantum evolution

As we mentioned, technology needed another approach to be able to face the barrier of the “tunnel effect”, for which it began to explore and it was found that one of the most effective ways was to use the known properties of quantum mechanics , which already we are in a position to use and manipulate in our favor. These properties include overlap and entanglement . It should be noted that this moment is called the first quantum revolution. what is quantum computing and how does it work

The so-called quantum superposition is a characteristic that quantum systems have , which allows them to be in a combination of several states simultaneously. On the other hand, quantum entanglement occurs when two or more quantum systems interact with each other.

The combination of these two properties, superposition and entanglement , allow us to create states that are not the usual ones, that is, they are capable of displaying exotic properties, which opens a door to different technologies that are unknown to this day. .

All this happens thanks to the aforementioned quantum characteristics “superposition”, which describes how a particle can be in different states at the same time, and “entanglement”, which explains how a set of minimum entangled particles are united in their existence in a way such that although there are thousands of light years between them, the change of state of one of these particles will affect the rest immediately and without anything mediating between them.

Second quantum revolution

The so-called second quantum revolution is based on the possibility of creating and manipulating quantum systems individually, which allows us to isolate and manipulate electrons or photons in isolation to use them in a way that adapts to our objectives, controlling how and when they interact between them.

As mentioned above, digital computers use “1” and “0”, called “bits” ; on the other hand, in quantum computers the basic unit of information is the “Qubit” . These qubits are basically individual quantum units to which we can establish states of superposition or entanglement with other qubits, controlling the intensity with which they do so. The latter is impossible to do with current transistor technology, which makes the huge difference between the two systems.

The quantum computer what is quantum computing and how does it work

The quantum computers , as its name implies, take advantage of the quantum properties of certain elements such as superposition and entanglement to execute algorithms quantum, using the so – called qubits, we allow reaching capabilities much higher processing than anything seen up to now.

However, it is wrong to think that quantum computers do the same as digital computers but much faster. The true purpose of a quantum system like this is to solve operations through so-called quantum algorithms, which we will talk about later, much more efficiently. In other words, in order to have a quantum computer to play Minecraft, we will have to wait a long time.

To understand this, nothing better than an example. In this we need a digital computer to calculate the most viable route to reach any destination among 1000 alternatives. In this case, the digital computer will need to repeat the calculation process 1000 times to find the most direct route.

On the other hand, a quantum computer, thanks to the process called “quantum parallelism”, is capable of analyzing all the alternatives at the same time, saving a considerable amount of time. This ability makes quantum computers have such an important relevance in today’s world, because if we get more computing power we can get more benefits.

In this sense, there are already some solutions based on quantum computing , especially in the field of scientific research, however there are some applications of quantum computers in the commercial market, such as those offered by IBM with its System One.

However, the quantum computer for the moment will not be able to replace digital computers, but they are two technologies that will complement each other and cooperate together for many years.

What are quantum computers for?

Computers stopped being dreams on paper years ago, today there are quantum computers in operation and most governments and high-tech companies are involved in the development of this type of technology, since they have more than demonstrated that Once they have been installed at all levels, these quantum computers will revolutionize the way in which various sectors such as the economy, industry, research and business develop and grow, offering, thanks to the great computing capacity of these better and more sophisticated quantum computers services their customers.

In this sense, what quantum computers promise is to exceed the processing capacity of current computers in order to solve problems and situations that cannot be solved with digital computers. However, this is an extremely difficult task, since a quantum computer is nothing like a computer as we users know, and it poses significant challenges.

quantum computer does not work in the same way as a digital computer, since it does not have any of the elements that we have become accustomed to using, that is, they do not have memory or hard disk. Basically quantum computing consists of storing information in the so-called quantum states of matter and using quantum gate operations to carry out the process of this stored information.

For this to happen we must learn to program quantum interference. In this sense, we must develop the so-called quantum algorithms that use the aforementioned peculiarities of entanglement and superposition, which will allow us to get the full potential of these quantum computers in order to solve very complex calculations that today are far from the reach of human beings. digital computers, such as calculating the configuration of molecules with a large number of electrons, situations in which the algorithms of classical computing fail.

Although all kinds of tests are being carried out, and even as we mentioned above there are already commercial quantum computers such as the IBM System One, for the moment the full potential that this type of technology can achieve is ignored. However, what has been seen is enough for many companies to start investing in its research and development.

The areas of industry and research that have contributed the most to the development of quantum technology are, for example, the chemical industry for drugs and materials, oil companies for the development of new materials, the automotive industry for the development of new materials that allow improvement. productions and vehicles, the security and logistics industry, among many others.

Some of the technology companies researching quantum computers include Microsoft, Alibaba, Tencent, Nokia, Airbus, HP, AT&T, Toshiba, Mitsubishi, SK Telecom, Thor, Lockheed Martin, Righetti, Biogen and Volkswagen.

The fact is that quantum computing allows to take the development of artificial intelligence far beyond what we imagine, and in the not too distant future, everything will move through large AI centers, and the main players in the world economy they do not want to be left out of this technological revolution.

Some of the main reasons why quantum computers are not yet a reality for all users, are that in addition to being very difficult to develop, they are also very difficult to build, physically locate and program, and above all there is no budget that can encompass the purchase of a quantum computer.

That is why quantum computers have a projected market niche located in the same place that supercomputers occupy today. S i well as mentioned IBM already has on the market a quantum computer, as well as D-Wave and other companies, the fact is that this is only the tip of the iceberg, since experts indicate that the first commercial computers quantum of general use will appear in the market towards the third or fourth decade of the XXI century, with quantum computers that are capable of exceeding at least 1000 qubits.

How a quantum computer works what is quantum computing and how does it work

One of the key conditions for the particles that act as qubits to be read and written is that they must be perfectly controlled and be stable long enough for both to happen. This is because the materials of which qubits are composed are still being studied, and in order to control them, control devices based on superconducting materials and ion traps are used.

To trap these ions, these traps use optical fields or electromagnetic fields forming a kind of mesh, although it is also possible to use a combination of both. To interlace their spin states through their vibrations, the ions are pushed through the use of control lasers.

There are also other types of control mechanisms, but they are really very complex to design and put into operation, since their circuits of superconducting materials must be cooled to very low temperatures, almost to absolute zero, that is to say about −273.15 ° C. . Also, there should not be any type of electrical resistance. Under these conditions it is almost impossible for the circulation of electrons to be exhausted. To control the qubits, systems are used that allow the modification of the current flowing through the circuit.

With these mechanisms it is possible to control a significant number of atoms, and they work much better than ion trap-based devices. Some of the technology companies that use this type of superconducting materials for the operation of their quantum computers are Google, Waves-D and IBM, among others.

Likewise, there are other quantum computer manufacturing technologies, based on semiconductor materials and solid state components, however, these do not reach the necessary degree of perfection and stability. Studies are also being carried out with other types of quantum systems, such as quantum optical systems, which use optical traps to trap photons, using light waves that control these photons.

Quantum computer programming languages what is quantum computing and how does it work

Although quantum languages have existed before the first quantum computers were created , the truth is that these languages ​​were used to simulate the behavior of quantum algorithms in digital computers. This fact changed when the first quantum computers began to be built, after which a race began by companies and research institutes first to develop a programming language for their own devices and then to try to standardize them for all other quantum computers. However, it is a winding path, and without the collaboration of all the actors it is difficult to carry out.

This fact has motivated the development of open source quantum programming languages , that is to say that it is possible to contribute to the improvement and extension of these languages ​​and then use it in their own developments, which has also led to the search for the so-called ” universal quantum programming language ”, which will allow a much faster and more focused development.

Currently, there are several quantum programming languages ​​such as QCL (Quantum Computing Language), Q # or OpenQASM (Open Quantum Assembly Language), and it is also possible to program basic quantum computing circuits using JavaScript or Python, but at the same time New programming languages ​​are also being developed, which aim to solve all the problems that can be found when programming a quantum computer.

Most popular quantum algorithms

One of the most important properties of quantum computing is the so-called “implicit parallelism”, which allows an exponential number of basic transformations to be processed through a linear number of qubits in a quantum system. At this point there are various quantum algorithms that allow us to take advantage of this advantage, which we will mention below.

Deutsch-Jozsa algorithm, or “how to look at both sides of the coin at the same time”.

The Deutsch-Jozsa algorithm was developed and proposed by David Deutsch and Richard Jozsa in 1992 and was improved by Richard Cleve, Artur Ekert, Chiara Macchiavello, and Michele Mosca later, more precisely in 1998.

do quantum computers exist
do quantum computers exist

The basic function of this quantum algorithm is to determine if a black box type function is of the “constant” or “balanced” type. It should be noted that this quantum algorithm does not have too many practical applications, however it is used as one of the best examples of a quantum algorithm that has been shown to be faster than any other possible deterministic classical algorithm. do quantum computers exist

Shor’s algorithm, or “how to factor in polynomial time”.

The Shor ‘s algorithm, developed and proposed by Peter Shor in 1995 is closely related to modular arithmetic, and is also the best known quantum algorithm when talking about security and cryptography.

Peter Shor also developed quantum error correction, and it was one of the first methods to ensure error-proof quantum computing. This was a more than important advance, since due to its quantum nature, the error corrections of digital computing cannot be applied to the quantum field. do quantum computers exist

Grover’s algorithm, or “how to find a needle in a haystack.”

The algorithm developed by Lov Grover , and published in 1996, was able to show that a problem of practical utility could be solved more quickly with a quantum algorithm than with the best available classical algorithm.

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