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- Title
Controlled unidirectional reflectionlessness by coupling strength in a non-Hermitian waveguide quantum electrodynamics system.
- Authors
Qiu, De-Xiu; Li, Fude; Xue, K.; Yi, X. X.
- Abstract
Unidirectional reflectionlessness is investigated in a waveguide quantum electrodynamics system that consists of a cavity and a Λ -type three-level quantum dot coupled to a one-dimensional plasmonic waveguide. Analytical expressions of transmission and reflection coefficients are derived and discussed for both resonant and off-resonant couplings. By appropriately modulating the coupling strength, phase shift and Rabi frequency, unidirectional reflectionlessness is observed at the exceptional points (EPs). And unidirectional coherent perfect absorption is exhibited at the vicinity of the EP. These results might find applications in designing quantum devices of photons, such as optical switches and single-photon transistors.
- Subjects
QUANTUM electrodynamics; COUPLINGS (Gearing); REFLECTANCE; OPTICAL switches; QUANTUM dots; WAVEGUIDES; PHASE shift (Nuclear physics)
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2024, Vol 38, Issue 18, p1
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979224502291