Ingrid Fadelli is a writer for Phys.org.
Physicists have been studying quantum technology and quantum many-body systems. Two out-of-equilibrium processes that have attracted particular attention are quantum thermalization and information scrambling.
The relaxation to equilibrium is a process through which quantum many-body systems achieve thermal equilibrium. Information scrambling involves scattering local information into many-body quantum entanglements, which are distributed throughout a quantum many-body system.
Researchers at the University of Science and Technology of China, the Shanghai Research Center for Quantum Sciences, and the Chinese Academy of Sciences have recently observed both thermalization and information scrambling in a superconducting quantum processor. Their findings, published in a paper in Physical Review Letters, could pave the way for new studies on the thermodynamics of quantum many-body systems.
Xiaobo Zhu, one of the researchers who carried out the study, told Phys.org that the non-equilibrium properties of quantum many-body systems are relevant to whether the integrability of the quantum system is broken.
It can be difficult to investigate thermalization and information scrambling in non-integrable quantum systems. The implementation of both types of systems on the same quantum simulator is required.
To conduct successful experiments researchers need to be able to collect accurate and efficient measurement of entanglement and mutual information. Scientists can quantify thermalization and information scrambling using multi-qubit quantum state tomography.
We studied thermalization and scrambling in the 12-qubit chain and ladder, performing quantum simulations of the 1D XX model, in our recent work.
A group of people decided to study quantum thermalization and information scrambling in a high programmability quantum processor. They were able to study the non-equilibrium dynamics of the qubit chain and ladder by tuning all qubits to the same interacting frequencies.
The local observables can be measured by projecting all qubits to the Z projections. We were able to study the 1D chain and the non-integrable ladder in the same quantum processor because of the ladder-type architecture of the circuit.
They investigated thermalization and information scrambling in their qubit array chain and ladder. Their observations show that the properties of out-of-equilibrium quantum many-body systems are affected by integrability.
The first experimental signature of information scrambling, which is characterized by a stable negative value of TMI in the non-integrable system, lays down the foundation for further experimental studies on it in other platforms.
Zhu and his colleagues were among the first to study quantum many-body systems using a highly programmed quantum processor.
In the future, the size of the circuit they used could be expanded further to carry out computations that would be harder to perform using classical computers. The researchers would like to expand on their recent work in their next studies.
We plan to include more qubits to form a larger system. The quantum advantage has been demonstrated on the state-of-the-art superconducting quantum processor. We plan to use this processor to demonstrate more exciting phenomena.
More information: Qingling Zhu et al, Observation of Thermalization and Information Scrambling in a Superconducting Quantum Processor, Physical Review Letters (2022). DOI: 10.1103/PhysRevLett.128.160502 Journal information: Physical Review LettersThe Science X Network will be launched in 2022.
Citation: Thermalization and information scrambling in a superconducting quantum processor (2022, May 19) retrieved 19 May 2022 from https://phys.org/news/2022-05-thermalization-scrambling-superconducting-quantum-processor.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
All Rights Reserved © 2024
