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Liouvillian Spectral Transition in Noisy Quantum Many-Body Scars.

Jin-Lou Ma1, Zexian Guo1, Yu Gao1

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This summary is machine-generated.

Quantum many-body scars resist decoherence from environmental noise. Weak ergodicity breaking in these systems shows surprising robustness against dephasing, crucial for quantum technologies.

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Area of Science:

  • Quantum physics
  • Condensed matter theory
  • Quantum information science

Background:

  • Decoherence is a major obstacle for quantum technologies.
  • Quantum many-body scars exhibit unusual dynamics.
  • Understanding environmental noise effects is crucial.

Purpose of the Study:

  • Investigate the impact of dephasing on quantum many-body scars.
  • Analyze the transition in scarred eigenmodes under noise.
  • Determine the robustness of scarred dynamics against system size.

Main Methods:

  • Focus on models with approximate su(2)-structured scar subspaces.
  • Analyze Liouvillian eigenmodes under local pure dephasing.
  • Examine critical dephasing rates in different physical platforms.

Main Results:

  • Scarred eigenmodes show a PT-symmetry breaking-like transition with increasing dephasing.
  • This transition originates from a quantum jump effect.
  • Critical dephasing rates exhibit weak system-size dependence in XY spin ladders and PXP models.

Conclusions:

  • Quantum many-body scars demonstrate unexpected robustness against dephasing.
  • The findings are vital for designing fault-tolerant quantum computing architectures.
  • This research paves the way for harnessing scarred dynamics in noisy quantum systems.