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Representation of the excitonic state. (a) Qubit sphere. The azimuthal angle represents the relative phase between ∣0⟩ and ∣1⟩, whereas the polar angle determines the relative population in each state. (b) SQD energy diagram.
Free rotation of the qubit excited by delayed pulses. (a) and (b) Trajectory of the pseudospin vector on the qubit sphere when the free rotation angles are and , respectively. (c) and (d) Populations on the upper level as a function of the free rotation angle in the ranges of and , respectively. (e) Envelope of the population oscillation as a function of phase angle. (f) Normalized oscillation amplitude as a function of phase angle .
Rabi rotations of the qubit. (a) and (b) Motion of the pseudospin vector corresponding to input pulse areas and , respectively. The shortening of the vector as it evolves is meant to illustrate the effect of decoherence. (c) Population of the upper level as a function of pulse area. (d) Normalized oscillation amplitude extracted from (c).
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