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Related Experiment Videos

Preventing multipartite disentanglement by local modulations.

G Gordon1, G Kurizki

  • 1Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel.

Physical Review Letters
|October 10, 2006
PubMed
Summary
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Local differences in particle-bath couplings cause rapid disentanglement in quantum systems. However, locally controlled perturbations can create symmetry, enabling decoherence-free multipartite entanglement, crucial for quantum technologies.

Area of Science:

  • Quantum Information Science
  • Quantum Many-Body Systems
  • Quantum Thermodynamics

Background:

  • Multipartite entangled quantum systems are fundamental for quantum information processing.
  • Coupling to a zero-temperature bath typically leads to rapid disentanglement due to local, symmetry-breaking interactions.
  • Preserving entanglement in realistic noisy environments is a major challenge.

Purpose of the Study:

  • To investigate methods for preserving multipartite entanglement in the presence of a zero-temperature bath.
  • To identify conditions under which decoherence-free entangled states can exist.
  • To explore the role of local control in mitigating environmental noise.

Main Methods:

  • Theoretical analysis of an entangled multipartite system coupled to a zero-temperature bath.

Related Experiment Videos

  • Introduction of locally controlled perturbations to modify particle-bath couplings.
  • Symmetry analysis to identify conditions for decoherence-free evolution.

    • Main Results:

    • Demonstration that local, symmetry-breaking couplings cause rapid disentanglement.
    • Identification of a specific symmetry that can be imposed via local perturbations.
    • Establishment that this imposed symmetry allows for the existence of decoherence-free multipartite entangled states.

    Conclusions:

    • Locally controlled perturbations offer a viable strategy to protect multipartite entanglement from environmental decoherence.
    • Imposing symmetry through local control is key to creating robust entangled systems.
    • This work provides a theoretical framework for designing and maintaining entangled states in noisy quantum systems.