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Quasiparticle excitations in many-body systems add a universal entanglement contribution, independent of system details. This finding offers new ways to create quantum entanglement in complex systems.

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Area of Science:

  • Quantum Information Theory
  • Condensed Matter Physics
  • Quantum Field Theory

Background:

  • Understanding quantum entanglement in many-body systems is crucial for quantum technologies.
  • Quasiparticle excitations are fundamental to describing excited states in diverse physical systems.

Purpose of the Study:

  • To quantify the quantum entanglement contribution of quasiparticle excitations.
  • To establish a universal formula for this entanglement contribution.
  • To explore the implications for creating entangled states.

Main Methods:

  • Analytical derivations in 1D free field theories and higher dimensions.
  • Numerical simulations on harmonic chains and lattices.
  • Supporting calculations for integrable spin chains and interacting models.

Main Results:

  • Quasiparticle excitations contribute additively to entanglement entropies (von Neumann and Rényi).
  • This contribution exhibits a simple, universal form largely independent of excitation properties and system geometry.
  • A quantum information theoretic interpretation relates quasiparticle entanglement to qubit assignments.

Conclusions:

  • The universal entanglement contribution of quasiparticles provides a powerful tool for characterizing quantum states.
  • The findings suggest novel strategies for engineering quantum entanglement in various many-body systems.
  • This work bridges quantum information theory and condensed matter/field theory.