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Home » AI » Google’s Quantum AI Has Redefined Physics Problems

Google’s Quantum AI Has Redefined Physics Problems

Google's Quantum AI lab, in collaboration with other researchers, has leveraged quantum simulators to achieve a breakthrough in physics. Their research tackles previously unsolvable problems, like simulating 1D quantum magnets, ushering in a new era of scientific discovery.

tech chilli logo by Tech Chilli Desk
Wednesday, 5 June 2024, 23:58 PM
in AI
Quantum simulators are now addressing complex physics problems, such as the dynamics of 1D quantum magnets and their potential similarities to classical phenomena like snow accumulation. Recent research confirms some aspects of this theory, but also highlights challenges in fully validating the KPZ universality class in quantum systems. Credit: Google LLC

Quantum simulators are now addressing complex physics problems, such as the dynamics of 1D quantum magnets and their potential similarities to classical phenomena like snow accumulation. Recent research confirms some aspects of this theory, but also highlights challenges in fully validating the KPZ universality class in quantum systems. Credit: Google LLC

One of the significant phenomena in the sphere of AI in recent years has been the emergence of quantum simulators. This enables researchers to solve various physics problems previously only solved in theory and numerics.

Among these challenging issues are quantum magnets, particularly 1D quantum magnets, which are chains of spin-1/2 particles. This was a new perspective brought about newly published research by the Google Quantum AI Laboratory with other researchers.

Preliminary Results of the Investigation of Dynamics of ‘‘Spin-1/2 particles’’ in Quantum Magnets

The study investigates a statistical mechanics problem that has been the focus of attention in recent years: Techniques that described snow falling and clustering and behaving as the complex structures in a chemical laboratory could be used to describe such a 1D quantum magnet. It is rather puzzling that the two systems are correlated but in a 2019 paper, the Ljubljana University physicists have numerically identified remarkable scaling numerics which led them to hypothesize that the spin dynamics in the spin-1⁄2 Heisenberg model belongs to the Kardar-Parisi-Zhang (KPZ) universality class behavior according to the growing rims of the spin-spin correlation function at the infinite

Originally, the KPZ equation was conceived to model the linear, stochastic interaction of an interface with an external drive and has been found to correctly capture a growing number of classical systems belonging to the KPZ universality class, including, for example, the growing front of forest fires. The writers of the paper questioned the Ljubljana scale’s legibility since the spin-1⁄2 Heisenberg model is within this universality class of systems since it is linear and non-stochastic unlike the other systems in the class.

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Insights from Quantum Simulations

Starting 2022, quantum simulations began to offer some answers to this question with an experiment that involved cold atoms in a system created by scientists from the Max-Planck-Institut für Quantenoptik. To test this conjecture, they observed the system in the course of the cooling process which allowed the initial imbalance of the magnetic spins to relax. The experimental results supporting this conjecture were published in Science in 2022.

The Google collaboration took on the suggestion by proving the spin dynamics in this context from the standpoint of the experiment obtained from their superconducting quantum processor within a comparatively short span of time as is possible from an experiment in quantum computing and further, analyzed it in detail in terms of statistics. In particular, applying the variational technique to a chain of 46 superconducting qubits, they determined the probability distribution of the number of spins crossed the centre of the chain or transferred magnetization.

The probability density function had a mean and variance that varied with time in a manner that I expected for a distribution in the KPZ universality class, and agreed with the work of the Max-Planck-Institut group. However, the researchers observed clearly violated skewness and kurtosis for the transferred magnetization after careful examination of the third and the fourth moments collected in the experiment, suggesting that the conjecture does not apply for the timescales of the actual experiment within the framework of the KPZ universality class.

The observation made by Google Quantum AI and the rest of the team has proved beneficial to give an insight of the dynamics of 1D quantum magnets. Quantum simulation is relevant to tackle other, more complicated physical problems. Later studies have revealed that these magnets exhibit dynamic behaviors akin to the classical models of snow sintering, although with certain variations. This is more or less a good time for quantum physics since we are progressively being in a position to design and come up with tools and technologies that enable us drill around the globe aspects which we lack adequate solution.

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