Physicists have calculated the time of the state of superposition of graphene qubits

Date:

2019-01-03 01:45:11

Views:

3917

Rating:

1Like 0Dislike

Share:

Physicists have calculated the time of the state of superposition of graphene qubits Source:

The Possibility of practical use of quantum computers one step closer thanks to graphene. Experts from the Massachusetts Institute of technology and their colleagues from other research institutions were able to calculate the time of superposition, which may include qubits, built on the basis of graphene. The results of the study according to article Nature Nanotechnology.

The Idea of quantum superposition is well illustrated by the famous thought experiment called "Schrodinger's cat". Imagine a box in which we placed a live cat, the atom that emits radiation with a certain probability and a device that produces a deadly gas when it detects radiation. Close the box on the half hour. Question: cat in the box alive or dead? If the probability that the gas is produced every hour, the chances that the cat in the box alive or dead is 50 to 50. In other words, the cat exists in a superposition of being both "half dead" and "half alive". To confirm current status you must open the box and see, but at the same time that we destroy a state of superposition.

Quantum computers use the same principle of superposition. Traditional computers store and process information in bits employed in the binary system of measurement of information – data are the state of "zeros" or "ones" that are understood by the computer in the form of certain teams. In the quantum computers are used, there is not half-dead and half-dead cats, qubits — the basic unit of information that can acquire simultaneous state of "zeros" and "units". This feature allows them to substantially exceed the computational ability of ordinary computers. The longer that the qubits can remain in this state (also known as coherence time), the more productive will be the quantum computer.

Scientists did not know the coherence time of qubits based on graphene, therefore, in the new study, they decided to calculate and to verify whether these qubits to be in superposition. As it turned out, I can. According to calculations, the time of the superposition of graphene qubits is 55 nanoseconds. After this they returned to their "habitual" as "zero".

"In this study, we were motivated motivation is the possibility of using properties of graphene to improve the performance of superconducting qubits. We first showed that the graphene consisting of a superconducting qubit may temporarily make the condition of quantum coherence, which is a key condition for building more complex quantum circuits. We have created a device that made it possible to measure the coherence time of the graphene qubit (the primary metric of the qubit) and find out what time a superposition of these qubits is of sufficient duration, allowing a person to manage this condition," — comments on the work of lead author of the study Joel I-Jan Wang.

It Might seem that the coherence time of 55 nanoseconds for a qubit is not so much. And you can't go wrong. It's actually a little bit, especially considering that the qubits created on the basis of other materials, showed coherence time, hundreds of times greater than this figure, indirectly indicating that quantum computers they have higher performance. However, graphene qubits have their advantages over other types of qubits, the researchers note.

For Example, graphene has a very strange but useful feature – it is able to acquire properties of superconductivity, "copying" it from the neighboring superconducting materials. Scientists from mit have tested this property by placing a thin sheet of graphene between two layers of boron nitride. The location of the graphene between two layers of superconducting material has shown that graphene a qubit can switch between States when exposed to energy, not the magnetic field, as is the case in qubits from other materials.

The Advantage of this scheme is that the qubit in this case begins to act more like a traditional transistor, opening the possibility of combining a larger number of qubits on a single chip. If we talk about qubits based on other materials, they work when you use the magnetic field. In this case, the chip would have to integrate the current loop, which in turn would occupy additional space on the chip, and also prevented the next of qubits that would result in errors in calculations. The scientists added that the use of graphene qubits more efficient because the two outer layers of boron nitride acting as a protective shell, protecting the graphene from defects through which might leak running down the chain electrons. Both of these characteristics can really help in creating practical quantum computers.

A Small coherence time of qubits graphene scientists are not scary. The researchers note that can solve this issue by changing the structure of the graphene qubit. In addition, specialists are going to understand in more details how using these qubits are moved electrons.

To Discuss the approaching era of quantum computing .

Recommended

Is it possible digital immortality and whether it

Is it possible digital immortality and whether it

when will man become immortal through digital technologies. I don't believe it. And you? In 2016, the youngest daughter Jang JI-sen This died of the disease associated with the blood. But in February, the mother was reunited with her daughter in virt...

Why bad long sit at the computer and how to fix it

Why bad long sit at the computer and how to fix it

I've recently conducted a small survey among friends and acquaintances about how they evaluate their effectiveness when working remotely. Almost everyone I know — now work from home with computer and phone. And, as it turned out, even those who...

Parametric architecture: can artificial intelligence to design cities?

Parametric architecture: can artificial intelligence to design cities?

When you think about the future, what pictures arise in front of your eyes? As a lover of retro-futurism – a genre which is based on representation of the people in the past about the future, I always imagined the city of the future built buildings, ...

Comments (0)

This article has no comment, be the first!

Add comment

Related News

At MIT used a biological virus in order to speed up your computer

At MIT used a biological virus in order to speed up your computer

whenever the computer (and any other electronic device) processes the data, there is a small delay, that is to say, the transfer of information "from one equipment to another" (e.g. from the memory to physical). The more powerful ...

New particles could open the way to photonic computers

New particles could open the way to photonic computers

All modern electronic devices use to transmit information of the electrons. Now in full swing, the development of quantum computers, which many consider the future replacement of traditional devices. However, there is another, no ...

New computer type architecture of the brain can improve data processing methods

New computer type architecture of the brain can improve data processing methods

Scientists from IBM are developing a new computer architecture that will be better suited to handle increasing volumes of data coming from algorithms of artificial intelligence. They draw their inspiration from the human brain, an...

The company D-Wave has launched an open and free platform for quantum computing

The company D-Wave has launched an open and free platform for quantum computing

With the wide spread of quantum computers needs to produce a real revolution in the field of computer science, providing not only extra power but also improved performance in cybersecurity. We already have quantum computers, but ...

Excursion to the Museum of computers that changed the world

Excursion to the Museum of computers that changed the world

For some reason, old computers don't become classics. Few people contains them with the same concern as contain antique furniture or cars. Probably the reason that they are not suitable for use in the modern world even though the ...

The Intel found 3 vulnerabilities. They allow you to steal

The Intel found 3 vulnerabilities. They allow you to steal

Today Intel announced three new vulnerabilities of their processors. According to the American company, these vulnerabilities can be exploited to gain access to some data stored in the computer memory. Under the threat of a proces...

9-th generation Intel CPU with 8 cores will be presented October 1

9-th generation Intel CPU with 8 cores will be presented October 1

there were rumors that Intel introduced the 9 generation of processors in October. Although the 10-nanometer chips Cannon Lake company was postponed until 2019, the updates this year will be based on the improvement of the existin...

The story of the first Macintosh computer, which is the headquarters of Microsoft

The story of the first Macintosh computer, which is the headquarters of Microsoft

Not so long ago the history of the first business card of bill gates and Paul Allen, which is stored in the exhibition hall of the headquarters of Microsoft are available to visit. In this room there's something else worthy of not...

The story of the first business card of bill gates and Paul Allen

The story of the first business card of bill gates and Paul Allen

All with something started. Microsoft started with two friends who decided to write software for the microcomputer. They started a company and made myself business cards. Today, these business cards are stored in the Microsoft hea...

Users of computers began to threaten the publication of personal videos and browser history

Users of computers began to threaten the publication of personal videos and browser history

computer Users around the world have started to receive e-mails from Scam to extort money. Depending on who sent the letter, its contents may change. However, colleagues from Business Insider was able to extract common features in...

7 laptops for those who want to buy the best

7 laptops for those who want to buy the best

If you want to buy the most efficient laptop today, you need to look at the model with a premium design and materials, high-resolution display, processor and 16 gigabytes of RAM. In this case, you have the choice not too big. Here...

The hacker stole the files of the U.S. army, but could not sell them even for $ 150

The hacker stole the files of the U.S. army, but could not sell them even for $ 150

the Hacker has guessed to use the vulnerability of routers to gain access to the files of the U.S. army. The obtained data he attempted to sell on the forum on the darknet, but was unable to find an interested buyer, even reducing...

Secret

Secret "pocket" Surface from Microsoft is with a folding screen

Microsoft is working on a mysterious new device from the Surface has at least a few years. The device, codenamed "Andromeda" was repeatedly flashed in patents, reports, references in the operating system, and should include design...

The smallest computer in the world has become even smaller

The smallest computer in the world has become even smaller

When IBM said in March that created the smallest computer in the world, scientists from the University of Michigan with displeasure raised eyebrows because IBM is the championship belonged to them. Now the smallest computer in the...

Intel has created the world's smallest quantum chip

Intel has created the world's smallest quantum chip

Already practically does not remain doubts that in the future quantum computers, if not will replace the familiar to us computers, then certainly strongly they will press. The success in this sphere do have a company and recently,...

In the United States represented the most powerful supercomputer in the world

In the United States represented the most powerful supercomputer in the world

the US Department of energy introduced the world's most powerful supercomputer, selected the title from the Chinese Sunway TaihuLight. Peak performance supercomputer American Summit reached 200 petaflops. (200 quadrillion calculat...

HAL 9000 will never appear: emotions are not programmed

HAL 9000 will never appear: emotions are not programmed

HAL 9000 is one of the most famous cinematic artificial intelligence. This superior form of intelligent computer malfunctioned on the way to Jupiter in the iconic film, Stanley Kubrick's "Space Odyssey 2001", which is currently ce...

Developed a fundamentally new type of qubit for a quantum computer

Developed a fundamentally new type of qubit for a quantum computer

an international group of scientists, consisting of Russian, British and German experts in the field of quantum technologies has created a revolutionary technology of qubits based on dzhozefsonovskikh the transition that represent...

#news high tech | Issue 238

#news high tech | Issue 238

Every Monday in the new issue of «News high-tech» we summarize the previous week, talking about some of the most important events, the key discoveries and inventions. This time we will focus on the toothbrush for mining,...

New Russian supercomputer called

New Russian supercomputer called "talker"

On the territory of Russia operate more than ten supercomputers, the leader of which is considered to be . Its performance is more than 2 petaflops, which provides him 63rd place in the ranking of most powerful supercomputers in t...