Final-state read-out of exciton qubits by observing resonantly excited photoluminescence in quantum dots

Details Final-state read-out of exciton qubits by observing resonantly excited photoluminescence in quantum dots Final-state read-out of exciton qubits by observing resonantly excited photoluminescence in quantum dots

2006-12-27

arxiv.org/abs/cond-mat/0612629v1

Appl. Phys. Lett. 90, 051909 (2007).

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, to appear in Appl. Phys. Lett

Scientific paper

10.1063/1.2435600

We report on a new approach to detect excitonic qubits in semiconductor quantum dots by observing spontaneous emissions from the relevant qubit level. The ground state of excitons is resonantly excited by picosecond optical pulses. Emissions from the same state are temporally resolved with picosecond time resolution. To capture weak emissions, we greatly suppress the elastic scattering of excitation beams, by applying obliquely incident geometry to the micro photoluminescence set-up. Rabi oscillations of the ground-state excitons appear to be involved in the dependence of emission intensity on excitation amplitude.

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