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Probing spectral features of quantum many-body systems with quantum simulators
Jinzhao Sun1,2, Lucia Vilchez-Estevez3, Vlatko Vedral4
1Clarendon Laboratory, University of Oxford, Parks Road, Oxford, United Kingdom. jinzhao.sun.phys@gmail.com.
Nature Communications
|February 6, 2025
Summary
This study introduces a new quantum simulation method to probe spectral features of quantum materials. The technique efficiently reveals excitation spectra using native quantum dynamics, offering robust and scalable analysis.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
Background:
- Characterizing quantum materials requires efficient spectral feature probing.
- Understanding quantum material structure and dynamics is crucial.
Purpose of the Study:
- Establish a framework for probing excitation spectra in quantum many-body systems using quantum simulators.
- Develop a method that relies solely on native time evolution without ancillary systems.
Main Methods:
- Realize a spectral detector by processing observable dynamics with probabilistically sampled time intervals.
- Engineer frequency resonance to probe the excitation spectrum.
- Utilize native time evolution governed by the Hamiltonian.
Main Results:
- Achieve logarithmic time complexity for transition energy estimation relative to simulation accuracy.
- Demonstrate noise robustness, maintaining polynomial time complexity in the presence of device noise.
- Present simulation results for gapped and gapless quantum systems (spins, fermions, bosons).
Conclusions:
- The developed framework enables efficient and robust spectral probing of quantum many-body systems.
- The method is scalable and applicable to various quantum systems, including experimental demonstration on IBM quantum devices.
- This approach advances the characterization of quantum materials through quantum simulation.
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