Physicists have discovered a potentially game-changing feature of quantum everyday behavior that would allow scientists to simulate complex quantum systems without the need for enormous computing power.
For some time, the development of the next generation of quantum computers has been limited by the processing speed of conventional processors. Even the fastest supercomputers in the world were not powerful enough, and existing quantum computers are still too small to be able to model medium-sized quantum structures, such as quantum processors.
However, a team of researchers from the universities of Loughborough and Nottingham and Innopolis have now found a way to circumvent the need for such large amounts of energy by mastering the chaotic behavior of qubits ̵
In modeling the behavior of quantum bits (qubits), they found that when an external energy source, such as a laser or microwave signal, was used, the system became more chaotic – eventually demonstrating a phenomenon known as hyperchaos.
When qubits were excited by the power supply, they switched states, such as ordinary computer bits, that switch between zero and one, but in a much more irregular and unpredictable way. However, the researchers found that the degree of complexity (hyperchaos) does not increase exponentially as the size of the system increases – whatever is expected – but instead it remains proportional to the number of units.
In a new article “Occurrence and control of complex behavior in controlled systems of interacting qubits with scattering”, published in the journal Nature NPj quantum information, the team shows that this phenomenon has great potential to allow scientists to simulate large quantum systems.
One of the relevant authors, Dr. Alexander Zagoskin, of the Loughborough School of Science, said: “A good analogy is the design of airplanes. In order to design an airplane, it is necessary to solve some equations of hydro (aero) dynamics, which are very difficult to solve and became possible only after the Second World War, when powerful computers appeared.However, people had designed and flown airplanes long before.This was because the behavior of airflow could be characterized by a limited number of parameters, such as eg the Reynolds number and the Mach number, which can be determined by small-scale experiments, without which a direct simulation of a quantum system in full detail using a classical computer becomes impossible since it contains more than a few thousand qubits. , there is not enough matter in the universe to build a classic computer capable of dealing with the problem.If we can characterize different modes of 10 00 A 0-qubit quantum computer with only 10,000 such parameters instead of 210,000 – which is approximately 2 times 1 with three thousand zeros – this would be a real breakthrough. ”
The new results show that the quantum system shows qualitatively different models of general case behavior and the transitions between them are controlled by a relatively small number of parameters.
If this is true in general, then researchers will be able to determine the critical values of these parameters by, for example, building and testing scale models and, by making a few measurements of the actual system, find out if the parameters of our quantum processor allow it to work properly or not.
As a bonus, the controllable complexity of the behavior of large quantum systems opens up new possibilities in the development of new quantum cryptography tools.
Error-protected quantum bits are tangled for the first time
AV Andreev et al. Occurrence and control of complex behavior in controlled systems of interacting qubits with dissipation, NPj quantum information (2021). DOI: 10.1038 / s41534-020-00339-1
Provided by the University of Loughborough
Quote: Physicists use “hyperchaos” to model complex quantum systems in part of the computing power (2021, January 26), extracted on January 27, 2021 from https://phys.org/news/2021-01-physicists- hyperchaos-complex-quantum -fraction.html
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