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- W2023997615 abstract "We numerically demonstrate all-optical logic operations with quantum dots (QDs) embedded in a bimodal photonic-crystal waveguide using Maxwell-Bloch equations in a slowly varying envelope approximation (SVEA). The two-level QD excitation level is controlled by one or more femtojoule optical driving pulses passing through the waveguide. Specific logic operations depend on the relative pulse strengths and their detunings from an inhomogeneouslly broadened (about 1$%$ for QD transitions centered at $1.5phantom{rule{0.222222em}{0ex}}ensuremath{mu}$m) QD transition. This excitation controlled two-level medium then determines passage of subsequent probe optical pulses. Envelope equations for electromagnetic waves in the linear dispersion and cutoff waveguide modes are derived to simplify solution of the coupled Maxwell-Bloch equations in the waveguide. These determine the quantum mechanical evolution of the QD excitation and its polarization, driven by classical electromagnetic (EM) pulses near a sharp discontinuity in the EM density of states of the bimodal waveguide. Different configurations of the driving pulses lead to distinctive relations between driving pulse strength and probe pulse passage, representing all-optical logic and, or, and not operations. Simulation results demonstrate that such operations can be done on picosecond time scales and within a waveguide length of about $10phantom{rule{0.222222em}{0ex}}ensuremath{mu}$m in a photonic-band-gap (PBG) optical microchip." @default.
- W2023997615 created "2016-06-24" @default.
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- W2023997615 date "2011-11-28" @default.
- W2023997615 modified "2023-09-23" @default.
- W2023997615 title "Optical pulse dynamics for quantum-dot logic operations in a photonic-crystal waveguide" @default.
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- W2023997615 doi "https://doi.org/10.1103/physreva.84.053848" @default.
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