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Area of Science:

  • Quantum optics
  • Many-body physics
  • Condensed matter theory

Background:

  • Subradiant states in atomic arrays coupled to waveguides are crucial for quantum information processing.
  • Understanding their behavior in the strongly interacting many-body regime is essential.

Purpose of the Study:

  • To theoretically investigate subradiant states in atomic arrays under strong interactions.
  • To analyze the impact of excitation fill factor (f) on many-body quantum states.

Main Methods:

  • Developed a generalized many-body entropy of entanglement.
  • Employed exact numerical diagonalization.
  • Utilized high-order singular value decomposition for state analysis.

Main Results:

  • Revealed the breakdown of fermionized subradiant states with increasing excitation fill factor (f).
  • Observed emergence of short-ranged dimerized antiferromagnetic correlations at f=1/2.
  • Demonstrated complete disappearance of subradiant states for f > 1/2.

Conclusions:

  • The excitation fill factor critically influences subradiant states in atomic arrays.
  • Strong interactions lead to novel correlations and the vanishing of subradiant states at high excitation densities.