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Dimerization of Many-Body Subradiant States in Waveguide Quantum Electrodynamics
Alexander V Poshakinskiy1, Alexander N Poddubny1
1Ioffe Institute, St. Petersburg 194021, Russia.
Physical Review Letters
|November 5, 2021
Summary
Subradiant states in atomic arrays break down as excitation density increases. At high densities, antiferromagnetic correlations emerge, causing subradiant states to vanish.
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.
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