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Embedding Quantum Many-Body Scars into Decoherence-Free Subspaces.

He-Ran Wang1, Dong Yuan2, Shun-Yao Zhang2

  • 1Institute for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China.

Physical Review Letters
|April 29, 2024
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Summary
This summary is machine-generated.

This study introduces a method to engineer quantum many-body scars in open quantum systems using controlled environmental coupling. Dissipative scarred dynamics enable persistent oscillations and potential quantum metrology applications.

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Area of Science:

  • Quantum Physics
  • Many-Body Systems
  • Open Quantum Systems

Background:

  • Quantum many-body scars are special states in nonintegrable systems that exhibit coherent dynamics.
  • Engineering these scars in open systems interacting with an environment is a significant challenge.

Purpose of the Study:

  • To develop a general framework for embedding quantum many-body scars into decoherence-free subspaces.
  • To explore the dynamics and applications of engineered scars in open quantum systems.

Main Methods:

  • Embedding quantum many-body scars into decoherence-free subspaces of Lindblad master equations.
  • Constructing Liouvillian dissipators using local projectors and Hamiltonian rotations.
  • Demonstrating the protocol with models hosting many-body scar towers.

Main Results:

  • Dissipative scarred dynamics exhibit persistent periodic oscillations for generic initial states.
  • The engineered scars can be utilized for quantum metrology applications.
  • A framework for exact embedding of scars into decoherence-free subspaces was established.

Conclusions:

  • The proposed framework successfully engineers quantum many-body scarred dynamics in open systems.
  • The method offers a pathway to utilize scar states for practical applications like quantum metrology.
  • Experimental observation is feasible using digital quantum simulations and ancilla qubit resetting.