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Emulating Many-Body Localization with a Superconducting Quantum Processor.

Kai Xu1, Jin-Jun Chen2,3, Yu Zeng2,3

  • 1Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China.

Physical Review Letters
|February 27, 2018
PubMed
Summary
This summary is machine-generated.

Researchers observed many-body localization (MBL) in a quantum system, challenging thermalization. They directly measured the logarithmic growth of entanglement entropy, a key MBL signature, using a 10-qubit processor.

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Area of Science:

  • Quantum physics
  • Statistical mechanics
  • Condensed matter physics

Background:

  • Generic closed quantum systems typically thermalize.
  • Many-body localization (MBL) challenges thermalization due to disorder and interactions.
  • Directly observing MBL signatures like logarithmic entanglement growth is experimentally difficult.

Purpose of the Study:

  • To experimentally emulate many-body localization (MBL) dynamics.
  • To provide direct evidence for the long-time logarithmic growth of entanglement entropy.
  • To validate superconducting quantum processors for simulating complex quantum systems.

Main Methods:

  • Utilized a 10-qubit superconducting quantum processor.
  • Emulated a spin-1/2 XY model with programmable disorder and long-range interactions.
  • Measured nonequilibrium imbalance, eigenstate thermalization hypothesis violation, and entanglement entropy growth.

Main Results:

  • Successfully emulated MBL dynamics in a 10-qubit system.
  • Observed key MBL signatures, including initial nonequilibrium imbalance and violation of the eigenstate thermalization hypothesis.
  • Provided direct experimental evidence for the long-time logarithmic growth of entanglement entropy.

Conclusions:

  • Superconducting quantum processors can accurately simulate MBL phenomena.
  • Experimental verification of MBL signatures is now achievable.
  • This work advances the simulation of quantum many-body systems.