The absolute record of the qubit being in a stable state for 38 minutes at room temperature was set by European and Canadian physicists. This was made possible thanks to the found system, in which virtually no noise exists, which made it possible to create high-performance qubits. Created a new type of qubit, opens up the possibility to create quantum computers that can work in the "home".
The article in the journal Science states that in their last experiment, the scientists managed to fix the qubit's lifetime, which is 10 times longer than that achieved in previous experiments, in which the qubit's life was usually limited to two seconds or less. For now, such qubits cannot be “read” or “written down” at room temperature, but scientists are confident that they will be able to do this in the near future.
Stafani Simmons of the University of Oxford and her colleagues created a “qubit record holder” experimenting with quantum memory cells based on phosphorus atoms “glued” to a plate of pure silicon. As a rule, all experiments with qubits are carried out at ultralow temperatures close to absolute zero. The authors of the article decided to test how the qubits invented by them would behave in room conditions. To their surprise, they did not lose their contents during “defrosting” and continued to maintain a healthy state for another 38 minutes.
“For some, 38 minutes may seem like a very small figure, however, while reducing the stability of a qubit by one percent, we can perform over 20 million operations. Therefore, the discovery of such a stable qubit can help us create a quantum computer, ”said Stephanie Simmons.
“Now we need to make such qubits“ communicate with each other, ”which is the last key problem on the way to creating a quantum computer, said Stephanie Simmons.
It is known that qubits can be connected with each other, that is, an unobservable link can be imposed on them, which is expressed in the fact that with any change over one of several qubits, the others change consistently with it. In other words, a set of qubits entangled among themselves can be interpreted as a filled quantum register. Like a single qubit, the quantum register is much more informative than the classical register of bits. It can not only be in various combinations of its constituent bits, but also realize all sorts of subtle dependencies between them.
Despite the fact that we ourselves cannot directly observe the state of qubits and quantum registers in their entirety, they can exchange their state with each other and can transform it. Then there is the possibility to create a computer capable of parallel computing at the level of its physical device, and the only problem left is to read the final result of the calculations.
The article is based on materials .
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