Physicists have created the first quantum chip with the «eternal» memory

© TU Delft/ScixelТак the artist imagined the eternal qubits and quantum nodes in a global networkPhysicists have created the first quantum chip with the «eternal» memory© TU Delft/ScixelПодпишись to daily updates RIA Science

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Physicists from the Netherlands created the first «diamond» of the quantum processor, the memory cells which are updated faster than the disappearing of quantum communication between them, according to a paper published in the journal Nature.

«These experiments show that we are getting closer and closer to creating a real quantum networks and quantum computing devices. Of course, the frequency of such updates the content of the qubits need to increase about 100 times that such computing systems have become useful in practice, however, to achieve this is realistic,» — says the opening of the Laura Julien (Julien Laurat), physics at the Sorbonne in Paris (France).

Qubits represent both memory and compute modules of a quantum computer, which can simultaneously store and a Boolean zero and unit, thanks to the laws of quantum physics. Combine multiple qubits into a single computing system allows you to quickly solve mathematical or physical problems, finding answers to who, with the help of methods of brute force would take time comparable to the lifetime of the Universe.

As told RIA «news» Alexey Ustinov, one of the leading scientists of the Russian quantum center, physics quickly learned how to produce single qubits, able to live long enough for doing calculations. On the other hand, attempts to combine several qubits are facing great difficulties due to the fact that to write and read data from them is not as easy as it initially seemed.

One of the main problems, says Ronald Hanson (Ronald Hanson), a physicist from the University of Delft (the Netherlands) — the communication between qubits «live» much less time than scientists spend in their establishment. For this reason a quantum computer can’t work continuously, periodically updating the contents of the qubits and the relationships between them, as do the cells of memory of conventional computers.

Hanson and his team were able to solve this problem using the growing popularity of qubits based on miniature synthetic diamonds and a special algorithm of «trapping» of the memory cells of a quantum computer.

The «heart» of such a computing module is defect — atom of nitrogen or other element, «wormed» into the interior of carbon atoms. Similar defects scientists call «jobs,» or NV-centers, because the addition of an atom of nitrogen in the diamond creates a crystal lattice is a special empty space with unusual properties. At this point, the carbon atom is missing, but it has all the properties of the atom, which was at this point in a «frozen» state.

Thanks to diamond qubits, says Hanson, initially have very long lifetimes compared to other memory cells. Dutch scientists managed even to extend their life by protecting the defects from all sources of interference, and establish a set methodology that allowed them to «confuse» the electrons in the NV-centers at 40 times per second, causing them to exchange a single particle of light.

Coupled with the very long lifetimes of the qubit is about 300-500 milliseconds, this technology allows to continuously update their content at 10 times per second and actually makes them «eternal». Now scientists can read the contents of a memory location, transferring it to another qubit, update it and then re-record the read data with 100% chance of success.

«It turns our quantum network analog of the conventional Internet – we always have «the media» and any nodes it can communicate at any time. Together with our partners from the telecommunication companies, we plan to connect the four cities in the Netherlands with the help of quantum entanglement. They will be the first nodes of a quantum Internet in 2020,» concludes Hanson.

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