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Stable quantum-correlated many-body states through engineered dissipation.

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Engineered dissipation prepares entangled quantum states for simulations. This method offers a scalable alternative to unitary evolution for noisy quantum processors, enabling exploration of complex quantum models.

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Area of Science:

  • Quantum Physics
  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Engineered dissipative reservoirs can guide many-body quantum systems to useful correlated steady states.
  • These states are valuable for quantum simulations, particularly in high-temperature superconductivity and quantum magnetism.

Purpose of the Study:

  • To demonstrate the preparation of low-energy states in many-body quantum systems using engineered dissipation.
  • To explore the scalability and effectiveness of this approach on superconducting quantum processors.

Main Methods:

  • Utilized up to 49 superconducting qubits to couple a quantum system to dissipative auxiliary qubits.
  • Prepared low-energy states of the transverse-field Ising model and explored transport in the quantum Heisenberg model.

Main Results:

  • Observed long-range quantum correlations and high ground-state fidelity (0.86) for 18 qubits at the critical point in a 1D system.
  • Detected mutual information extending beyond nearest neighbors in a 2D system.
  • Successfully explored quantum transport by coupling to reservoirs with different chemical potentials.

Conclusions:

  • Engineered dissipation is a viable and scalable method for preparing entangled many-body states.
  • This technique provides a promising alternative to unitary evolution for quantum simulations on noisy quantum processors.